ISSN 1002-6495
CN 21-1264/TQ
Started in 1989

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Experimental Study On Preparation of Sulfuric Acid Dew Point Corrosion Simulated Gas by Current Carrying Method
Sulfuric acid dew point corrosion is a common and difficult problem in thermal power plants. It is of great significance to study its mechanism, influencing factors and protection methods. The main obstacle currently facing its research is how to obtain a reliable sulfuric acid dew point corrosion s. . .
Corrosion Science and Protetion Technology, 0 Vol. (): 0-0    DOI: 10.11903/1002.6495.2019.106
 
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Study on bactericidal and reinforcing mechanism of D-tyrosine to iron bacterial biofilm on carbon steel surface PDF (735KB)
2019-11-07
Study on corrosion behaviors of hot-rolled AH36 plate in indoor storage environment PDF (1733KB)
2019-11-07
Effect of Sn and Al on Corrosion Resistance of Nickel-Free Paktong PDF (453KB)
2019-11-07
Experimental Study On Preparation of Sulfuric Acid Dew Point Corrosion Simulated Gas by Current Carrying Method PDF (397KB)
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Effect of Preparation and Surface Modification of TiO2 on Its Photoelectrochemical Cathodic Protection Performance PDF (892KB)
2019-11-07
Current Issue More>>
      15 November 2019, Volume 31 Issue 6 Previous Issue   
    Detection of Atmospheric Corrosion of 316L Stainless Steels by Electrochemical Noise: Theoretical Model and Applications
    XIA Dahai,SONG Yang,SONG Shizhe,XU Likun
    Corrosion Science and Protetion Technology. 2019, 31 (6): 557-564.   DOI: 10.11903/1002.6495.2019.052
    Abstract   HTML   PDF (5628KB)

    The corrosion detection of metallic materials in atmosphere environment by using electrochemical noise (EN) methods has received much attention in recent years, because the EN measurement system based on asymmetric electrodes was established, while a theoretical model base on Thevenin equivalent circuit when using asymmetric electrodes was also developed. The corrosion extent of two 316L stainless steels exposed to atmospheres with different relative humidity could be detected by EN. Meanwhile, theoretical analysis indicates that the measured potential noise, current noise and noise resistance are influenced by solution resistance Rs, and impedance modulus of working electrode Za and counter electrode Zc. The spectral noise resistance is affected by Rs, Za, Zc as well as the power spectral density of the working electrode and counter electrode. Experimental results indicate that the acquired electrochemical data are significantly influenced by solution resistance Rs in the atmosphere with relative humidity of 30%. However, the EN data is basically not influenced by Rs for the case with very high relative humidity. In the atmosphere with low relative humidity, both the pitted steel and the blank steel show similar electrochemical behavior, indicating that even the pitted ones are not electrochemically active in such situation. In the atmosphere with high relative humidity, the EN data of these two steels show big difference: many transient peaks with higher amplitudes can be seen in both of the potential noise and current noise of the pitted one in the contrast to that of the blank one. This is due to the enhanced electrochemical activity on the pitted metal surface, caused by breakdown and repassivation of the formed passive film. In sum, the present work opens a new way to detect localized corrosion in the atmospheric condition, and provides a scientific basis for corrosion detection of metallic equipment in another atmospheric environment such as industrial atmosphere.

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    Effect of Graphene on Corrosion Resistance of Chromium-free Dacromet Coatings
    CAI Jiabin,XIAO Qihong,YANG Lv
    Corrosion Science and Protetion Technology. 2019, 31 (6): 565-575.   DOI: 10.11903/1002.6495.2019.127
    Abstract   HTML   PDF (9301KB)

    Composite coatings based on Cr-free Dacromet coating with addition of different amount of graphene were prepared aiming to increase the corrosion resistance of Cr-free Dacromet coating. The corrosion performance of the coatings was assessed via ammonium nitrate rapid corrosion test, immersion test and salt spray test. The state of graphene in composite coatings was characterized by means of SEM, EDS, XRD and Raman spectroscope. While the electrochemical behavior of coatings in artificial seawater (3.5% (mass fraction) NaCl solution) was comparatively examined via open-circuit potential measurement and Tafel polarization curve and electrochemical impedance spectroscopy, and the corrosion mechanism was analyzed with the corresponding equivalent circuits. The results show that: (1) Zn is first consumed in the corrosion process, and Al reacts with other substances to form dense corrosion products, which are insoluble in water; (2) graphene as sheet-like structure is embedded between Zn- and Al-powder, which is overlapping and paralleling with Zn flake and Al powder, thereby, increases the compactness of coatings; (3) a small amount of graphene can increase the corrosion potential and decrease the corrosion current density of Cr-free Dacromet coating, and accordingly; (4) the capacitive arc radius and impedance of the composite coatings reached the maximum when the graphene content was 0.12%, and the salt spray resistance of the coatings was the best. In conclusion, the graphene can strengthen the barrier effect of Cr-free Dacromet coatings and delay the inward migration process of the corrosive species from the electrolyte.

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    Effect Thiourea Addition on Corrosion Inhibition of Benzotriazole for Copper Plate
    ZHUANG Huajian,WANG Chan,HE Fufeng,SONG Qijun
    Corrosion Science and Protetion Technology. 2019, 31 (6): 576-582.   DOI: 10.11903/1002.6495.2019.044
    Abstract   HTML   PDF (3816KB)

    The effect of thiourea (TU) addition to benzotriazole (BTAH) as a mixed inhibitor on corrosion inhibition for Cu-plate in 3% (mass fraction) NaCl solution was investigated by using electrochemical methods, scanning electron microscopy (SEM), contact angle and X-ray photoelectron spectroscopy (XPS). Results show that when 0.50 mmol/L TU is added to the BTAH containing medium, the corrosion current density of Cu-plate in 3%NaCl corrosion solution is significantly reduced, and the charge transfer resistance is improved, and the inhibition efficiency reached to 94.01%. After the test, a network-like oxide film was obviously emerged on the Cu surface, thereby, on which the static contact angle of water increased to 92.6°, in the meanwhile, the Cu-content on the top of the film on Cu-plate decreased, which indicated that the surface protective film was thickened and the protective effect was improved.

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    Corrosion Resistance of Two Al-alloys for Terminal Block
    CHEN Yun,YANG Bingkun,HAO Wenkui,WANG Xiaofang,SHEN Xielin,LI Zhen,ZHAO Rui
    Corrosion Science and Protetion Technology. 2019, 31 (6): 583-589.   DOI: 10.11903/1002.6495.2019.146
    Abstract   HTML   PDF (3569KB)

    The effect of temperature and NaHSO3 concentration on corrosion behavior of Al-alloys 5XXX and 6XXX, which are the common material of terminal blocks for transmission and transformation equipment of power grid, were investigated by electrochemical test. The corrosion morphology and corrosion rate of the two Al-alloys were assessed through alternative immersion test. The results show that in temperature range of 25~55 ℃, the corrosion rate of 6XXX Al-alloy increases with the increase of temperature, while the corrosion rate of 5XXX Al-alloy increases first and then decreases. With the increase of NaHSO3 concentration, the corrosion rate of 6XXX Al-alloy changed significantly. However, 5XXX Al-alloy has better corrosion resistance than 6XXX Al-alloy.

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    Microstructure and Properties of As-cast Mg-4Zn-xGa Alloys
    ZHU Weijun,CHEN Jihua,YAN Hongge,XIA Weijun,SU Bin,HUANG Wensen,GONG Xiaole
    Corrosion Science and Protetion Technology. 2019, 31 (6): 590-596.   DOI: 10.11903/1002.6495.2019.053
    Abstract   HTML   PDF (3208KB)

    Effect of Ga addition (1%, 2% and 5%, mass fraction) on microstructure, mechanical property and bio-corrosion resistance of the as-cast Mg-4Zn based alloys were investigated by OM, SEM, tensile testing and immersion test in Hank's solution. The Ga addition has a great effect on the grain refinement of the as-cast Mg-4Zn alloys, causing the increase of the amount of second phase particles and improving the ultimate tensile strength, the yield strength and the elongation to rupture. The as-cast Mg-4Zn-2Ga alloy exhibits the best comprehensive mechanical properties, with the ultimate tensile strength, yield strength and elongation to rupture of 233 MPa, 90 MPa and 24%, respectively, which are approximately 13.6%, 76.5% and 33.3% higher than the counterpart Mg-4Zn alloy. However, the Ga addition deteriorates the corrosion resistance of Mg-4Zn based alloys, even so, the Mg-4Zn-5Ga alloy exhibits better corrosion resistance than the Mg-4Zn-2Ga and the Mg-4Zn-1Ga alloys. The average corrosion rate and corrosion current density of the as-cast Mg-4Zn-5Ga alloy immersed in Hank's for 7 d are 2.3 mg/(cm2·d) and 29.5 μA/cm2 respectively.

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    Preparation and Corrosion Resistance of Glass Flake/Epoxy Composite Coatings in Marine Atmosphere
    YAN Chenxi,WANG Shengrong,ZHANG Tianyi,YANG Jianwei,CAO Jianping
    Corrosion Science and Protetion Technology. 2019, 31 (6): 597-602.   DOI: 10.11903/1002.6495.2019.037
    Abstract   HTML   PDF (2541KB)

    Glass flakes were modified with silane coupling agent, and characterized by Fourier transform infrared spectroscopy (FTIR). Then the modified glass flakes were blend with epoxy resin to prepared composite glass/epoxy paint. Further, the corrosion performance of the composite glass/epoxy coated carbon steel was assessed by means of neutral salt spray test and electrochemical impedance spectroscopy (EIS). The results show that this method can successfully modify the surface of glass flakes by increasing hydroxyl pairing, and the glass flakes have a good shielding effect on corrosive media in solution, which significantly improves the corrosion resistance of epoxy coatings. 30%(mass fraction) glass flake modified epoxy coating immersed in 3.5%NaCl solution for 648 h, the impedance modulus Z was above 107.6 Ω?cm2, which was much higher than that of ordinary epoxy coating. The diffusion coefficient D of water molecule in 30% glass flake modified coatings is 2.07×10-11 cm2/s, which is much smaller than that of ordinary epoxy coating 1.9×10-9 cm2/s.

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    Hierarchical Analysis on Repair Material for External Coating of Buried Pipeline
    TAO Youzhuo,MA Tingxia,LI Zhenjun,TAO Ting
    Corrosion Science and Protetion Technology. 2019, 31 (6): 603-608.   DOI: 10.11903/1002.6495.2019.031
    Abstract   HTML   PDF (2583KB)

    Three-layer polyethylene coating (3PE) has been widely used as an external coating for buried pipelines. The property of materials used for repairing 3PE external coatings has always been a core concern of the industry. The comprehensive evaluation and prediction, for the four kinds of repairing materials such as solvent-free epoxy, petrol-oil belt, viscoelastic body and cold-wrapped tape, are established by using analytic hierarchy process (AHP) in terms of the basic property of materials, construction-difficulty and -reliability, and economic applicability. The model compares the empirical data of the basic performance with the verification of the repairing effectiveness for the coating on pipeline and the comprehensive cost of the utilized materials. The results show that viscoelastic body is the most excellent material for repairing the damaged parts. Adhesion is the most important basic property indicator. According to the assessment, it follows that the higher the utilization rate is, the better the comprehensive property is for the repairing material. In high corrosive soil environment the composite material with high comprehensive property presents the higher utilization rate.

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    Characteristics of Oxide Scales Formed on T91 Martensite Steel and TP347H Austenite Steel in HighTemperature Steam
    GUO Dan,ZHANG Weike,PENG Zhanghua,SHI Qinglin,WANG Mengjiao,YI Zengqiang
    Corrosion Science and Protetion Technology. 2019, 31 (6): 609-614.   DOI: 10.11903/1002.6495.2019.059
    Abstract   HTML   PDF (2794KB)

    The oxide scales formed in high temperature steam on dissimilar materials, i.e. T91 martensite steel and TP347H austenitic steel, in the final superheater of a 350 MW supercritical generation unit were characterized by means of X-ray diffraction, metallographic microscope and scanning electron microscope with energy spectrum, with emphasis on the growth and spallation of oxide scales. The results indicated that there were significant differences of the oxide scales formed on T91 and TP347H tubes. It was not absolutely reasonable to adopt the emerge and the quantity of the formed Fe2O3 as the critical index for prediction of oxide scale spallation. Furthermore, the oxide scale on T91 tube often contains voids and/or microcracks, which can obviously induce the oxide scale spallation. However, for TP347H tube a continuous and compact inner oxide scale rich in chromia forms at the interface of oxide scale/substrate, which may act as an effective barrier to the growth of oxide scale.

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    Corrosion Behavior of X100 Pipeline Steel in Simulated Solution of Yingtan Soil
    YANG Xu,SUN Fuyang,LI Danping
    Corrosion Science and Protetion Technology. 2019, 31 (6): 615-621.   DOI: 10.11903/1002.6495.2019.136
    Abstract   HTML   PDF (5007KB)

    The effect of sulfate reduction bacteria (SRB) and aerobic ferric oxidation bacteria (AFOB) on the corrosion behavior of X100 pipeline steel in a simulated solution of the soil at Yingtan district was investigated by means of mass-loss measurement, linear polarization curve measurement, electrochemical impedance spectroscopy, SEM, EDS and XRD. Results show that in the sterile simulated solution, X100 pipeline steel suffered from moderate corrosion. With the increasing time, the corrosion rate of the steel decrease first and then increase slowly. The corrosion product in the sterile simulated solution is Fe2O3. After soaking for 5 d in the simulated solution with both SRB+IOB the steel suffered from severe corrosion, while after soaking for 17 and 40 d the corrosion turned to be moderate corrosion and the corrosion rate decreases with time constantly. Correspondingly, the corrosion products are FeS and Fe2O3. In conclusion, with the increasing time, the corrosion tendency of X100 pipeline steel in the sterile simulated solution increases constantly, while in the simulated solution with SRB+IOB decreases constantly. Accordingly, the corrosion rate of X100 pipeline steel in the sterile simulated solution first decreases quickly and then increases slowly, while in the solution with SRB+IOB decreases quickly. The corrosion of X100 pipeline steel is aggravated by SRB+IOB.

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    Failure Analysis of Surface Stellite Alloy Overlayer on Disc of Wedge Gate Valve in a Nuclear Power Plant
    ZHANG Min,MING Hongliang,WANG Fan,ZHANG Zhiming,WANG Jianqiu,HAN En-Hou,LV Qunxian
    Corrosion Science and Protetion Technology. 2019, 31 (6): 622-630.   DOI: 10.11903/1002.6495.2019.124
    Abstract   HTML   PDF (5082KB)

    The surface Stellite alloy overlayer was found to be locally fallen off from the sealing faces of a wedge gate valve disc in a nuclear power plant. The surface welding overlayer was serviced in high-temperature and high-pressure primary water containing B and Li. The microstructure and chemical composition of the surface welding overlayer, the surface and cross-sectional morphologies of the local fallen area were assessed by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy (EDS) . Results showed that cracks emerged on the Stellite overlayer, while the occurrence of falling off for the overlayer from the sealing faces was only limited in a small area. Obvious and big welding defects of shrinkage cavity during crystallization, and a small amount of welding holes and inclusions were found in the near surface layer of the Stellite overlayer. Improper welding procedure was believed to be the main reason for the formation of shrinkage cavity. These cavities were mainly distributed in the interdendrite, whilst continuous cavities with the characteristics of zonal distribution were nearly perpendicular to the overlayer surface. It is proposed that under the external pressing force of sealing faces, the internal welding shrinkage cavities may be apt to crack, therewith, initiate the cracking of surface overlayer.

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    Perforation Analysis of Rear Eccentric Reducing Joint for Outlet Valve of Decompression Tower Bottom Pump
    ZHENG Xiaojun,LIU Huijun
    Corrosion Science and Protetion Technology. 2019, 31 (6): 631-636.   DOI: 10.11903/1002.6495.2019.074
    Abstract   HTML   PDF (1690KB)

    Aiming at the leakage accident caused by perforation of rear eccentric reducing joint for the outlet valve of decompression tower bottom pump No.1 in an oil refinery, the chemical composition, microstructure and corrosion damage of the inner wall of the joint in the vicinity of the perforation site have been examined by means of chemical analysis, metallographic microscope, SEM and EDX. The results show that the synergistic action of the high temperature corrosion caused by sulfur in residual oil and the erosion of the residual oil fluid gives rise to the wall thickness reduction and finally the perforation of the eccentric reducing joint.

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    Degradation and Service Life Prediction of Organic Coatings/Carbon Steel in Simulated Atmospheric Environments
    PANG Zhen,SUN Wei,TANG Xiaobo,TANG Yuming,ZHAO Xuhui,ZUO Yu,LIU Bin,YANG Lei,YANG Rui
    Corrosion Science and Protetion Technology. 2019, 31 (6): 637-642.   DOI: 10.11903/1002.6495.2019.036
    Abstract   HTML   PDF (2847KB)

    The degradation and service life prediction for the corrosion of organic coatings/Q235 carbon steel system in three typical environments, i.e. marine atmospheric-, industrial atmospheric-, and marine industrial atmospheric-environments, respectively were estimated by means of the corrosion master simulation platform, in terms of the characteristics of longtime failure of organic coatings in atmosphere. The simulation results were compared and verified with the corrosion electrochemical test results and failure behavior of the coating in solutions, which aim to simulate the above three environments. The results showed that the simulation results are in good agreement with the experimental results in the same environmental conditions. It follows that the simulation technology can be used to study the failure behavior of organic coating/metal systems in the atmosphere, and the life prediction can be realized.

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    Failure Mechanism of 10 kV Aerial Insulation Line of Overhead Distribution System in Coastal andTyphoon Environment
    ZHOU Gang,LIN Deyuan,HAN Jiceng,YAN Kanghua,WAN Xinyuan,ZOU Zhimin,JIANG Chunhai
    Corrosion Science and Protetion Technology. 2019, 31 (6): 643-649.   DOI: 10.11903/1002.6495.2019.047
    Abstract   HTML   PDF (2563KB)

    The failure mechanism of a 10 kV aerial insulation line of overhead distribution system was investigated by means of macro- and micro-structure observation, energy dispersive spectrum, X-ray diffraction and mechanical performance test etc., taking a broken and corroded line as a typical example, which situated at the coastal area of Fujian province and experienced a severe harassing of typhoon “Nesat”. It is found that being struck by lightning, the insulation skin ablation and wire breakage did emerge on the line in the vicinity of the insulator binding area, which greatly reduced the mechanical strength of the line, especially when the plastic deformation of the rest part of wires occurred. As a result, the aerial insulation line would break under the combined action of tensile- and shear-force brought out by the strong typhoon “Nesat”. On the other hand, the highly corrosive environment of the coastal area has also led to local damage on the binding area, which subsequently resulted in water intrusion into the cable line, thus induced severe corrosion of the aluminum wires. The corroded wires could result in great reduction of the mechanical strength of the aerial insulation line, therefore, lead to huge potential risks of the line breakage when struck by typhoon.

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    Failure Analysis of 15Mo3 Tube Burst of Low-temperature Superheater in a Power Plant Boiler
    ZHANG Xin,ZHANG Kun,LIU Weidong,LI Mengyang,GAO Dawei,DU Shuangming,CAI Wenhe,BAI Zehong
    Corrosion Science and Protetion Technology. 2019, 31 (6): 650-658.   DOI: 10.11903/1002.6495.2019.065
    Abstract   HTML   PDF (5679KB)

    Failure analysis of the burst 15Mo3 tube for low-temperature superheater in large utility boilers is carried out by means of macroscopic observation, direct reading spectrometer, metallographic microscope, scanning electron microscopy, Brinell hardness tester and universal testing machine. The results show that the chemical composition of the burst tube meets the requirements of DIN17155 standard, and the tensile strength, yield strength, elongation and Brinell hardness of the tube samples reach 459 MPa, 355 MPa, 30.02% and 150, respectively, which meet the requirements of DIN17155 standard for 15Mo3 steel. The main reason for tube burst is that the wall of 15Mo3 steel tube underwent thinning continuously due to corrosion, and the excessive local thinning finally will cause the tube burst. The corrosion sites of the tube wall is mainly located below the urea spray gun. The main cause of corrosion is that the urea spray gun has poor atomization effect, urea drops onto and reacts with the outer wall of the relevant steel tube at high temperature, which results in the continuous local thinning of the tube wall. At the same time, some suggestions for safe and stable operation of the low-temperature superheater are put forward.

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    Corrosion Failure Analysis of Copper Wires in Terminal Boxes in a Rural Atmospheric Environment
    XU Song,XIE Yi,WANG Jun,LI Dengke,LI Wenbo,WU Tangqing
    Corrosion Science and Protetion Technology. 2019, 31 (6): 659-664.   DOI: 10.11903/1002.6495.2019.108
    Abstract   HTML   PDF (3720KB)

    Sulfates and chlorides are known as common corrosion products of Cu and its alloys in rural and marine atmospheric environments, respectively. However, a large amount of Cu7Cl4(OH)10·H2O was detected in the corrosion products of Cu wires in terminal boxes in a rural atmospheric environment in Hunan province. In this paper, the corrosion failure of Cu wires in terminal boxes in the rural atmospheric environment was analyzed by means of scanning electron microscope (SEM), X-ray diffraction spectra (XRD) and X-ray photoelectron spectrometer (XPS) as well as dissolution and analysis of relevant ions. The results show that the corrosion process of the copper wire in terminal boxes is accelerated by the chlorine ion deriving from the number tubes outside the Cu wires, which is the key cause of the failure. The high relative humidity (RH) in the terminal boxes is another key-factor to accelerate the corrosion of the Cu wire. In conclusion, the present chloride-ion containing number tubes in the substation terminal boxes are suggested to be replaced as soon as possible by chloride ion-free tubes, and the relative humidity (RH) should be strictly controlled.

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    Research Advance in Application of 2D Layered Double Hydroxides (LDHs) in Corrosion Protection of Metals
    FANG Lu,HE Qingqing,HU Jiming,ZHANG Jianqing
    Corrosion Science and Protetion Technology. 2019, 31 (6): 665-671.   DOI: 10.11903/1002.6495.2019.068
    Abstract   HTML   PDF (636KB)

    Layered double hydroxides (LDHs) have been widely used in many areas, such as adsorption, catalysis and fire retardants, as well as medicine and pharmacy etc. This paper first briefly describes the structural characteristics of LDHs and their applications in the field of corrosion protection of metals. Using micro- and nano- materials encapsulated corrosion inhibitors in protective coatings is an emerging anti-corrosion strategy in recent years. The synthesis methods and research progress of LDHs as nanocontainers doped with corrosion inhibitors are introduced in details. Then, the LDHs films fabricated on metal surface are reviewed with emphasis on their preparation processes and applications for temporary corrosion protection. In addition, the use of them as the pretreatment layer for painting systems is also briefly introduced. Finally, the possible developing directions of LDHs in the field of corrosion protection are prospected.

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    Investigation on Corrosion Characteristics of Pipeline in CO2 Ocean Storage System
    YAN Kai,XIANG Yong,CHEN Xiaoling
    Corrosion Science and Protetion Technology. 2019, 31 (6): 672-680.   DOI: 10.11903/1002.6495.2019.130
    Abstract   HTML   PDF (2478KB)

    Carbon capture and storage (CCS) technology is an important measure to reduce CO2 emissions. Using the ocean as a sequestration site for CO2 can permanently store a large amount of CO2, which has a bright future. Liquid CO2 transportation and complex marine environments are the main features of ocean storage systems. The high salt marine environment and impurities in liquid CO2 can cause severe internal and external corrosion to CO2 pipelines and other facilities. This paper introduced the principle and storage method of CO2 ocean storage, analyzed the main factors affecting the internal and external corrosion of CO2 transportation pipeline in ocean storage system, and listed several possible anti-corrosion measures. Finally, the research related to the corrosion issues of CO2 ocean storage system was prospected.

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    Survey and Analysis on Corrosion Events in Several Important Fields at Coastal City Yantai
    WANG Jianhua,LV Jian,ZHANG Yuxuan,HOU Baorong,MA Xiumin
    Corrosion Science and Protetion Technology. 2019, 31 (6): 691-698.   DOI: 10.11903/1002.6495.2019.087
    Abstract   HTML   PDF (1925KB)

    In view of serious corrosion in typical coastal cities, taking Yantai as an example, we made a corrosion survey concerning the corrosion status of 40 bridges, 3 ports and wharfs, 12 municipal pipe network units, 13 industrial enterprises and 20 tourism and entertainment units in the city of Yantai by means of questionnaire survey and field survey. The data related with corrosion and protection status of 88 investigation objects were obtained, and it was found that the corrosion events were serious in various industrial fields of Yantai. The general status of corrosion issue in the city is seriously that, reinforced concrete structures all suffered from corrosion of diversified types, such as surface voids and pits, cracks, rust spots, exposed reinforcing bars, corrosion cracking and so on. Steel structures also suffered from corrosion of different severities, such as damages or thinning of protective coatings and corrosion induced leakage points etc. With the Hoar method, the annual corrosion cost of Yantai city was estimated to be 2,354,336.4 ten-thousand RMB, accounting for 3.9% of the national gross domestic product.

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    Field Test and Case Analysis for a Gas Pipeline of Frequent Leakages
    LI Xiaxi,WANG Ning,WANG Qingyu,DU Yanxia
    Corrosion Science and Protetion Technology. 2019, 31 (6): 699-702.   DOI: 10.11903/1002.6495.2019.039
    Abstract   HTML   PDF (1325KB)

    With the large-scale construction of urban infrastructure, the number and material types of underground metal components have increased, and the service environment of buried gas pipelines has become increasingly complex. In particular, corrosion accidents of buried gas pipelines in residential areas have occurred frequently, however there is a lack of systematic analysis for the ground gas pipeline leakages. In this paper, the high-frequency leakage gas pipe section of frequent leakages in a certain district is taken as the research object, where a practical on-site inspection and laboratory test were performed so that to clarify the relevant case history and finally several countermeasures are proposed, which is believed to be proper reference for similar cases in the country.

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    Comparison of Durability Design for Marine Concrete Structure Between Chinese and British Standards and Their Applications for Engineering
    WANG Pengsheng,ZENG Junjie,FAN Zhihong,WANG Shengnian
    Corrosion Science and Protetion Technology. 2019, 31 (6): 703-710.   DOI: 10.11903/1002.6495.2019.077
    Abstract   HTML   PDF (927KB)

    By comparing the requirements for durability design of marine concrete structures specified in the Chinese standards and British specifications, their similarities and differences about design service life, corrosion environment classification and durability design parameters were analyzed. The provisions about design service life and corrosion environment classification are similar for the two standards. However, the British specifications provide more detailed design parameters for concrete durability design, and the Chinese standard uses a quantitative design method to verify service life. In the real engineering applications, durability design in British is simpler just requiring the strength class and constituents of concrete.

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