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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Experimental Study On Preparation of Sulfuric Acid Dew Point Corrosion Simulated Gas by Current Carrying Method PDF (397KB)
2019-11-07
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 Resistance of Two Aluminum Alloy Terminal Blocks PDF (1003KB)
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
Current Issue More>>
      15 September 2019, Volume 31 Issue 5 Previous Issue   
    Influence of Deposited Atmospheric Particulates on Initial Corrosion Behavior of Mild Steel
    YAN Songtao,JIN Ying,XU Feifan,WEN Lei
    Corrosion Science and Protetion Technology. 2019, 31 (5): 467-474.   DOI: 10.11903/1002.6495.2018.277
    Abstract   HTML   PDF (11083KB)

    The influence of atmospheric particulates on the initial corrosion behavior of mild steel was investigated via exposure test in haze environment of the field test side situated at University of Sciences and Technology Beijing and laboratory accelerated corrosion test as well. The morphology and composition of atmospheric particulates and corrosion products of the steel were analyzed by scanning electron microscope, ion chromatograph, Raman spectrometer and X-ray photoelectron spectroscopy. The results indicated that particulates mainly contained water-soluble salts (SO42-, NO3-, etc.) and precipitated insoluble components contained mainly Al and Si. The existence of particulates deposited on the surface of mild carbon steel could accelerate its initial corrosion process, which may be ascribed to the synergistic effect of the hygroscopicity and the containing water-soluble salts of the particulates.

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    Phase Composition and Evolution of Corrosion Products of Spring Steels with Cr- and V-addition
    ZUO Maofang,CHEN Yinli,MI Zhenli,NIU Gang,WANG Yunlong
    Corrosion Science and Protetion Technology. 2019, 31 (5): 475-482.   DOI: 10.11903/1002.6495.2018.267
    Abstract   HTML   PDF (19037KB)

    The corrosion performance of four spring steels with different contents of Cr and V was assessed via neutral salt spray corrosion tests for 24~288 h, which were then characterized by means of optical microscope, SEM with EDS and XRD, peculiarly the relative amount of phases in the corrosion products was also acquired by Rietveld quantitative phase analysis of the relevant X-ray diffraction patterns. The results show that: after test for 288 h, bi-layered rust scales formed on the steel substrate, which consists of a dark brown inner layer (30~50 μm) and a red-brown outer layer (100~180 μm). The outer layer is mainly composed of γ-FeOOH, and tends to spall off easily, while the inner layer contains α-FeOOH and Fe3O4, it is denser and firmly bonding to the matrix. Elements Cr and V are obviously enriched in the inner rust layer, but no Cl- were detected there, which indicates that the inward migration of Cl- is effectively prevented from arriving the inner rust layer. However, the outer rust layers contain a certain amount of Cl- but not Cr and V. The analysis results of the phases composition and their relative content of the rust layers at different corrosion stages comfirmed that the γ-FeOOH phase did form in the initial corrosion stage, and then for a long term the γ-FeOOH phase could gradually transform into α-FeOOH phase. Based on the above analysis, the relevant transformation model was proposed.

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    Potential Distributions for Coupling of Disimillar Metallic Pipes in 3.5%NaCl Solution
    CHEN Rihui,ZHOU Lin,ZHANG Cong,GAO Xinhua,ZHOU Xiaolong,YONG Xingyue
    Corrosion Science and Protetion Technology. 2019, 31 (5): 483-488.   DOI: 10.11903/1002.6495.2018.269
    Abstract   HTML   PDF (1667KB)

    For pipelines of conveying conductive fluids, a relatively active metallic pipe will be subjected to galvanic corrosion when coupled with a relative noble metallic pipe. In such case, many influencing factors may affect the length of the corroded portion of the former pipe. Therefore, the distribution of the inner wall potential along the pipe length for a couple of brass pipe with carbon steel pipe in static 3.5%NaCl solution were assessed by means of electrochemical measurement as well as numerical simulation. Results show that the carbon steel pipe, acting as the anode, was subjected to the accelerated corrosion with a corroded portion of ca 260 mm in length. The brass pipe, acting as the cathode, was protected with a protected portion of ca 800 mm in length. However, in flowing 3.5%NaCl solution, the length of the corroded portion of carbon steel pipe was decreased to 240 mm, and the length of the protected portion of brass pipe was also decreased to 600 mm. It follows that the relative error of the computational simulation with the experimental results was below 5.0%. Therefore, the theoretical formula could be used to estimate the lengths of both the corroded portion and protected portion for the two dissimilar coupled pipes. At the same time, this formula could also be applied for the determination of the maximum length of the protected portion of a pipe, which is subjected to cathodic protection by sacrifice anode.

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    Effect of Bi on Electrochemical Performance and Corrosion Morphology of Al-Zn-Ga-Si-Bi Alloy
    GUO Jianzhang,HU Chongwei,ZHANG Haibing
    Corrosion Science and Protetion Technology. 2019, 31 (5): 489-494.   DOI: 10.11903/1002.6495.2019.030
    Abstract   HTML   PDF (9767KB)

    Five low voltage sacrificial anode materials, namely Al-Zn-Ga-Si-based alloys with different Bi-addition were prepared. Then the effect of Bi on the electrochemical performance of alloys were assessed by means of electrochemical performance test, polarization curve measurement and electrochemical impedance spectroscopy, while the corrosion morphology of the alloys was characterized by macroscopic observation and 3D microscopic image. The results showed that an appropriate amount of Bi addition could effectively prevent the formation of oxide scale on the anode surface and alleviate the grain boundary corrosion, thereby improve the activation performance of the anode with a peculiar dissolution morphology. But the excessive addition of Bi in the alloy would reduce the uniform activation performance of the anode. The optimal Bi content of 0.05% (mass fraction) in the Al-Zn-Ga-Si-Bi anode is accepted as a low-potential sacrificial anode to provide cathodic protection for high strength steel.

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    Effect of Temperature On Corrosion of Weld Structures for X80 Steel in Artificial Seawater
    NIU Yinzhu,SHI Yanhua,YANG Zhongkui,WANG Ling,LIANG Ping,CUI Yong
    Corrosion Science and Protetion Technology. 2019, 31 (5): 495-500.   DOI: 10.11903/1002.6495.2019.014
    Abstract   HTML   PDF (3550KB)

    The effect of temperature on the corrosion behavior of weld structures of X80 steel in artificial seawater was studied via polarization curve measurement, AC impedance spectra measurement, SEM, EDS and chemical analysis. The result shows that the heat affected zone presents the greatest corrosion tendency, while the weld seam has better corrosion resistance than the base material. With the increasing temperature, the diffusion, discharge process and thus the corrosion were accelerated due to the depolarization of the anode. The weld seam shows better corrosion resistance rather than the base material and the heat affected zone as well, which may be ascribed to that the compactness and adhesion of the corrosion products on the weld seam are much better than that on the base material and the heat affected zone. In comparison to the base metal, the weld seam presents coarser grains with less grain boundaries as well as lower content of C, Mo and Nb, while, richer in Ni, Cr and Al, which all are responsible to the better corrosion resistance of the weld seam. On the other hand, the heat affected zone presents a complex microstructure of rather nonuniform distribution with very high activation energy, which then results in great tendency of corrosion.

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    Inhibition and Lubrication Properties of Thiazole Derivative and Its Adsorption Behaviour on N80 Steel
    AI Junzhe,WANG Huan,DUAN Lidong
    Corrosion Science and Protetion Technology. 2019, 31 (5): 501-507.   DOI: 10.11903/1002.6495.2019.026
    Abstract   HTML   PDF (4534KB)

    A new thiazole derivative corrosion inhibiting lubricant (ACPP) was synthesized, and then characterized by IR. The corrosion inhibition property of ACPP on N80 carbon steel in acidic solution was studied by weight loss and electrochemical method. The lubrication performance and persistence in drilling fluid, as well as the morphology of adsorption film formed on the steel of ACPP were assessed by extreme pressure lubrication instrument and scanning electron microscopy. Results show that due to the addition of ACPP, the corrosion rate of N80 carbon steel may be lowered to less than 0.076 mm/a and to 3 g/(m2·h) in CO2 saturated 3%NaCl solution and 15%HCl solution respectively; while the lubrication coefficient of the drilling fluid may be reduced by 81.64%. It follows that ACPP is an anodic corrosion inhibitor, meets the adsorption isotherm of Langmuir on N80 carbon steel. The excellent corrosion inhibition and lubrication behavior of ACPP may be ascribed to the formation of a well adhesive and compact adsorption film on the surface of N80 carbon steel.

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    Corrosion Electrochemical Behavior of AMS4340M Steel in 3.5%NaCl Solution
    HE Xianding,WANG Xiaoguang,XU Wei
    Corrosion Science and Protetion Technology. 2019, 31 (5): 508-514.   DOI: 10.11903/1002.6495.2018.265
    Abstract   HTML   PDF (5912KB)

    The corrosion behavior of AMS4340M steel for aircraft landing gear in 3.5%NaCl solution was studied by means of EIS, potentiodynamic polarization curve measurement and immersion corrosion test. Results show that the microstructure of the as received AMS4340M steel consists of tempered martensite, retained austenite and carbide. The corrosion mode of the steel during immersion is uniform corrosion. The corrosion products on the steel surface presented weak diffraction peaks of Fe2O3 and Fe3O4 in their X-ray diffraction patterns. In 3.5%NaCl solution, the steel exhibits anodic active dissolution with obvious passivation characteristics on its polarization curves. With the increasing immersion time, the free-corrosion potential (Ecorr) of AMS4340M steel increases gradually, with a maximum about -225 mV, while the corrosion current density gradually decreases (Icorr), with a minimum of 0.004 μA·cm-2, therewith, the corrosion rate gradually increases. The electrochemical impedance spectra of ASM4340M steel consist of capacitive arc resistance in both low frequency and high frequency regions, and the radius of capacitive arc resistance is the largest for the steel after 240 h immersion.

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    Effect of Several Processing Factors on Electrochemical Dechlorination Efficiency of Reinforced Concrete
    QU Feng,SUN Haoran,LEI Zhihao,SHI Weihua,WANG Gongxun,HU Song
    Corrosion Science and Protetion Technology. 2019, 31 (5): 515-520.   DOI: 10.11903/1002.6495.2019.028
    Abstract   HTML   PDF (1535KB)

    The effect of processing factors such as time, fly ash content, water reducing agent and air entraining agent on the electrochemical dechlorination efficiency was studied for reinforced concretes with saturated calcium hydroxide solution as electrolyte and stainless steel mesh as anode by an applied current density of 2 A/m2. The results showed that with the increasing time, the dechlorination efficiency increases. The 28 d dechlorination efficiency of concretes with 10% and 20% fly ash is 56.9% and 54.3% respectively, showing that the increase of fly ash content has little effect on the dechlorination efficiency. The 28 d dechlorination efficiency of concretes incorporated with water reducing agent is about 10% lower than that of the blank counterparts, while those incorporated with air entraining agent exhibits higher dechlorination efficiency than the blank counterparts, which reaches about 75.1%. After dechlorination, the residual chloride ions in the concretes concentrated within a zone below the concrete surface 15 mm to 35 mm, while the chloride ion nearby the steel bar is greatly reduced. During the dechlorination process, the potential of the reinforced bar increased negatively in the initial stage, then moved positively after a certain period, and later gradually reached the level of passivation potential.

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    Corrosion of Q235 Carbon Steel in Ammonia-based Flue Gas Desulfurization Slurry
    FU Zhihao,XU Jiahuan,WANG Dan,XIE Gang,LU Hao,LIAN Zhouyang,ZHOU Yongzhang,WEI Wuji
    Corrosion Science and Protetion Technology. 2019, 31 (5): 521-525.   DOI: 10.11903/1002.6495.2019.029
    Abstract   HTML   PDF (1983KB)

    The effect of F-, Cl- and (NH4)2SO4 on the corrosion of Q235 carbon steel in ammonia-based flue gas desulfurization slurry was studied by means of static immersion test, polarization curve measurement and long-term pitting corrosion test. The results showed that the uniform corrosion rate of Q235 steel in the halogen-containing ammonium sulphate slurry decreased first and then increased with the increase of F- and Cl- concentration. As the content of (NH4)2SO4 increased, the uniform corrosion rate decreased. The corrosion tendency of the steel increased with the increase of F- concentration, and decreased with the increase of Cl- concentration and the content of (NH4)2SO4. The pitting corrosion of Q235 carbon steel in ammonia desulfurization simulation slurry is serious, and therefore, heavy anti-corrosion measures are needed.

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    Influence of Bending Loads on Stress Corrosion Susceptibility of Oil-well Tubes
    ZHONG Bin,CHEN Yiqing,AI Fangfang,GAO Peng,LI Lin,MENG Fanlei,SAN Hongyu
    Corrosion Science and Protetion Technology. 2019, 31 (5): 526-530.   DOI: 10.11903/1002.6495.2018.280
    Abstract   HTML   PDF (7751KB)

    The influence of bending loads of 0, 50%, 80% and 90% of the yield strength of the test material respectively on the corrosion morphology and corrosion depth of oil-well tubes was investigated by means of OM, LCSM, EPMA et al. The result showed that the oil-well tubes presented a microstructure of tempered sorbite. With the increasing bending load, the pitting corrosion extends perpendicular to the pulling stress, the pitting corrosion turned to be strip-like gradually. The pits contiguous gathered together into huge ones as the degree of corrosion aggravated, which enhanced the stress corrosion susceptibility. It was revealed that the presence of Cr and Mo made rust layer denser, which could prevent the inward migration of H and S, therewith improved the anti-stress corrosion property of the oil-well tubes.

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    Failure Analysis of Thermocouple Sleeve in Wet Gas Transmission Pipeline
    XI Yuntao,HUANG Hangjuan,CUI Xi,ZHANG Yuan,LIU Rui
    Corrosion Science and Protetion Technology. 2019, 31 (5): 531-536.   DOI: 10.11903/1002.6495.2018.282
    Abstract   HTML   PDF (8394KB)

    A sudden failure emerged for a thermocouple in a section of pipeline at Changqing gas field after only 10 months of operation. Then the temperature measurement could not be carried out and the thermocouple was removed. It was found that there existed serious pitting corrosion on the outer wall of the thermocouple sleeve. The cause of the failure was comprehensively analyzed by means of macroscopic inspection of corrosion on both the inner- and outer-side of the sleeve wall, the SEM observation of the morphology of corrosion pits and EDS- and XRD-characterization of corrosion products etc. The results showed that instead of the designed 304 austenitic stainless steel, an improper material of 2Cr13 martensitic stainless steel was used in the manufacture of the thermocouple, accordingly which possesses weak resistance to corrosion. Meanwhile, there existed a certain amount of moist steam in the wet natural gas in the transmission pipeline, therefore, it may essentially be expected that due to the synergistic action of CO2, H2S, Cl- and other corrosion factors, the pitting corrosion was easy to occur on the 2Cr13 sleeve. Finally, aiming at the peculiar corrosion of thermocouple sleeve under this working condition, the relevant prevention measures were proposed.

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    Detection and Analysis of Interference with Natural Gas Pipeline in Mountainous Area from Grounding Grid of 500 kV Direct Current Power Transmission System
    WANG Ailing,LI Wenlei,WANG Qing,ZHANG Hailei,HE Li
    Corrosion Science and Protetion Technology. 2019, 31 (5): 537-543.   DOI: 10.11903/1002.6495.2018.279
    Abstract   HTML   PDF (3621KB)

    With the large-scale construction of high-voltage/UHV transmission lines, of which the interference with the nearby pipeline emerges frequently, and thus the relevant corrosion- and safety-issues of the pipeline have become increasingly growing problems. In this paper, a pipeline in the southwest mountainous area is taken as the research object. By detecting the magnitude and range of the influence of the grounding fault current on the pipeline under the unipolar operating state of the 500 kV DC transmission line system. The results show that the HVDC system has already caused certain threats to the safety of the natural gas pipeline. In order to get rid of the harmful effect of stray currents for the present natural gas pipeline operation, several relevant suggestions and countermeasures were put forward.

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    Review on Research and Development of Nuclear Radiation-resistant Coatings
    SUN Jing,LI Zhiqin,YANG Mingliang,NIU Yongfeng,WU Jianhua
    Corrosion Science and Protetion Technology. 2019, 31 (5): 544-550.   DOI: 10.11903/1002.6495.2019.019
    Abstract   HTML   PDF (1422KB)

    The corrosion issue and radiation environment in nuclear power plant, the relevant standards and specifications are reviewed. A few advanced radiation-resistant resin and functional filler are presented, including carboxyl-functionalized multi-walled carbon nanotube modified epoxy resin, ceria/graphene-epoxy nanocomposite coating, boron nitride, titanate nanofibers, molybdenum, vanadium and ferrochromium, which efficiently improved the radiation resistance of coatings. These advanced materials will promote the development of coatings for nuclear power plant in the future.

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    Analysis and Application of AC Interference Model of High-speed Railway with Oil Pipeline
    LI Ping,CUI Yu
    Corrosion Science and Protetion Technology. 2019, 31 (5): 551-556.   DOI: 10.11903/1002.6495.2019.142
    Abstract   HTML   PDF (2569KB)

    Based on electromagnetic field coupling theory, the coupling mechanism of the interference from AC electrified of high-speed railway with the buried oil pipeline nearby was analyzed. The mathematical calculation model of the related AC interference voltage was deduced. Combining with the operation parameters of high-speed railway traction system, the influence of power supply system on AC interference with the buried oil pipeline under different operation conditions of high-speed railway was calculated and predicted, and then evaluated according to relevant standards. Afterwards, the optimization calculation of the drainage scheme of the pipeline section was carried out. Finally, the comprehensive treatment scheme and suggestions of the pipeline section affected by the high-speed stray current interference were given.

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