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

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Electrolytically Descaling Behavior of Duplex Stainless Steel in Neutral Solution under Dynamic Conditions
Electrolyticall descaling behavior of 2205 duplex stainless steel in a neutral solution under dynamic conditions was investigated with rotating disk electrode. The results showed that, with the increasing movement speed of the test specimen from 0 to 30 m/min, the weight loss value of the specimen a. . .
Corrosion Science and Protetion Technology, 2016 Vol. 28 (6): 499-504    DOI: 10.11903/1002.6495.2016.053
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Corrosion resistance of ion assisted deposition aluminum film studies on magnesium alloy PDF (1876KB)
Corrosion Evaluation of Cement Mortar Lining in High Quality Reclaimed Water Pipes PDF (535KB)
Simulation Test Study of 20# Steel and 3004 Aluminum Alloy for Air-cooled Condensers Duct PDF (622KB)
The corrosion evolution of Q235B steel in simulated hot humidity coastal atmosphere PDF (404KB)
Preparation of Cu-Co Spinel Coatings PDF (1337KB)
Current Issue More>>
      29 June 2017, Volume 29 Issue 3 Previous Issue   
    Orginal Article
    Influence of Aging Temperature on Pitting Corrosion Resis-tance of AM355 High Strength Stainless Steel
    Hanrong GAO,Zhongze DU,Jianxiong LIANG,Changjun WANG,Jiaqi HU
    Corrosion Science and Protetion Technology. 2017, 29 (3): 213-219.   DOI: 10.11903/1002.6495.2016.161
    Abstract   HTML   PDF (4639KB)

    The effect of aging treatment at different temperature on the pitting corrosion behavior of stainless steel AM355 in 3.5%(mass fraction)NaCl solution was studied by means of potentiodynamic polarization technique and dynamic electrochemical impedance spectrum. The result showed that among others the pitting potential was the highest for the steel aged at 350 ℃ for 4 h. The repassivation potential didn't appear during reversed scanning for all the steels aged at different temperatures indicated they are hard to be repassivated. The aging temperature also showed effect on the distribution of alloying elements, while, the variation of Eb was related to the among of precipitated phase and residual austenite of the steel.

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    Corrosion Behavior of Si3N4-hBN Composite Ceramics in HF Solutions and Cryolite Molten Salt
    Changsong ZHANG,Qiang LIU,Wei CHEN
    Corrosion Science and Protetion Technology. 2017, 29 (3): 220-226.   DOI: 10.11903/1002.6495.2016.170
    Abstract   HTML   PDF (4355KB)

    Si3N4-hBN composite ceramics with different hBN content were prepared by hot pressed sintering process. Then the corrosion behavior of Si3N4 ceramic and Si3N4-10% (mass fraction) hBN composite ceramics was studied in HF solution with various molarities at 40 ℃and cryolite molten salt at 850 ℃ respectively. The results show that that the Si3N4 ceramics were suffered from significant corrosion in the above acid solution and molten. The corrosion of the two type ceramics in HF solutions was particularly serious, and their corrosion rate increased gradually with the increasing HF concentration, while the corrosion of Si3N4-10%hBN ceramics was much serious than that of Si3N4 ceramics. In cryolite molten salt, the corrosion rate of Si3N4-10%hBN was much higher than that of Si3N4 ceramic for the initial 20 h, hereafter the corrosion rate of Si3N4 ceramics gradually exceeded that of Si3N4-10%hBN ceramics, and in the final corrosion stage the corrosion rates of the two type ceramics reversed again. It is thought that the corrosion performance of the ceramics may be subjected to the microstructure and the Si3N4 content of the as prepared ceramics.

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    Corrosion Protective Behavior of Typical Inhibitor Pigments on Aluminum Alloy Used for Transportation
    Huaqiang LIN,Wenchao DUAN,Lin SUN,Hongwei SHI,Changsheng LIU,Fuchun LIU,En-Hou HAN
    Corrosion Science and Protetion Technology. 2017, 29 (3): 227-232.   DOI: 10.11903/1002.6495.2016.187
    Abstract   HTML   PDF (1652KB)

    A new cerium cinnamate was proposed as a green anticorrosive pigment for protection of 7XXX Al-alloy used in transportation. Taking commercial anticorrosive pigments, i.e., strontium chromate and modified strontium aluminum polyphosphate as reference, the corrosion inhibition of cerium cinnamate on the alloy and the corrosion protection behavior of the cerium cinnamate containing epoxy coatings were investigated. The results of immersion test indicate that the corrosion inhibition effect of strontium chromate and cerium cinnamate is stronger than that of modified strontium aluminum polyphosphate. The results of polarization tests indicate that although modified strontium aluminum polyphosphate has strong corrosion inhibition effect in the beginning of immersion, however, this effect becomes weaker at the end of immersion as compared with the effect of cerium cinnamate and strontium chromate. The results of electrochemical impedance spectra (EIS) show that the corrosion resistance of epoxy coating with 1%(mass fraction) cerium cinnamate is higher than the epoxy coatings with the other two pigments.

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    Macro Non-uniform Corrosion of Q235 Steel in Tropical and Coastal Red Soils
    Jiezhen HU,Peichang DENG,Jibiao ZHANG,Xiao GAO,Huanhuan HU,Quanbing LIU,Gui WANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 233-240.   DOI: 10.11903/1002.6495.2016.159
    Abstract   HTML   PDF (6790KB)

    The non-uniform corrosion of metal is easy to occur in soils, for the heterogeneity of soils. In this article, the macro non-uniform corrosion (MNC) behavior of carbon steel was researched by the wire beam electrode (WBE) technique, while the steel samples were buried in the tropical coastal red soil in a test site at Zhanjiang. The occurrence of MNC of carbon steel depended upon the length of buried time and the corresponding depth of the spot on the buried samples, of which the former may be ascribed to the change of soil moisture with the changing amount and frequency of rainfall within the buried term, and the later may be ascribed to the variation of the moisture content, oxygen content and composition of soil with the depth of soil. In the range (0~90 cm) of the soils depth, the corrosion rate increased with the increase of the soils depth. Much intensive corrosion could be observed for the long length samples of carbon steel by the soil depth around the ranges 30~50 cm, 80 cm and 140~150 cm, which was resulted from the galvanic corrosion.

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    A New Type of High Temperature Resistant Coating on Copper Alloy Used for Distributor of Gas Appliance
    Liwen CHENG,Guan WANG,Chong ZHANG,Guangrong XIE,Jiawei LIAO
    Corrosion Science and Protetion Technology. 2017, 29 (3): 241-246.   DOI: 10.11903/1002.6495.2017.035
    Abstract   HTML   PDF (2800KB)

    A new type of high temperature resistant coating with methyltrimethoxysilane (MTMS) and silica solution as main film former, and with appropriate pigments was applied on Cu-alloy, which is used for distributor of gas cooker or gas water heater. The results show that the resistance to thermal shock of the coating is mainly related to the surface roughness of the substrate (grit diameter), the coating thickness as well as the temperature and time of the coating sintering process; an optimal coating with high resistance to thermal shock can be obtained when the surface of copper alloy was sandblasted with 10 to 30 mesh sand, the thickness of coating is between 20~30 μm and the coating sintering is conducted at 200 ℃ for 10 min, which can withstand up to 32 cycles thermal shock between heating to 500 ℃ and water cooling.

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    Degradation of Typical Protective Coatings on Al-Alloy Used for Transportation in High-temperature and High-humidity Region
    Huaqiang LIN,Lin SUN,Wenchao DUAN,Hongwei SHI,Changsheng LIU,Fuchun LIU,En-Hou HAN
    Corrosion Science and Protetion Technology. 2017, 29 (3): 247-251.   DOI: 10.11903/1002.6495.2016.204
    Abstract   HTML   PDF (2259KB)

    The degradation of a typical organic coating system composited of phosphide priming paint, nano-composite epoxy primer and nano-composite polyurethane topcoat for protection of Al-alloy used for transportation was investigated by out-door exposure test for 1 a in Guangzhou, a region of high-temperature and high-humidity in the Southern China. After 1 a exposure, some corrosion related spots were found on the coating surface . The color difference of the coating increases with the time. The analysis of attenuated total reflectance Fourier transform infrared spectroscopy indicates that the degradation of polyurethane resin occurred on the coating. The analysis of electrochemistry impedance spectra shows that the coating keeps high corrosion protectiveness as it was although degradation of polyure thane resin took place.

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    Electrocatalytic Activity and Durability of Mn-Mo-Ce Oxide Anode in Sea Water
    Yanhua SHI,Jixiang ZHOU,Ping LIANG,Feng LIU,Ling WANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 252-256.   DOI: 10.11903/1002.6495.2016.289
    Abstract   HTML   PDF (2019KB)

    Mn-Mo-Ce oxide anode material was prepared on Mn-Mo oxide anode by electrodeposition in an electrolyte with addition of CeCl3. The electrocatalytic properties of Mn-Mo-Ce oxide anode were assessed by methods of cyclic voltammetry, Tafel polarization curves and electrochemical impedance spectroscopy. The durability of the Mn-Mo-Ce oxide anode in sea water was examined by accelerated test and the surface morphology of the oxide anode was characterized by SEM. Results show that with the doping of Ce-oxide, the formed Mn-Mo-Ce oxide coating is dense with a fine microstructure, of which on the surface there exists uniformly distributed fine vesiculates and a large number of micro-cracks, therewith resulting in the increase of the real surface area and the number of active points on the surface and in turn enhance the electrocatalytic performance of Mn-Mo-Ce oxide electrode. The main destruction form of the Mn-Mo-Ce oxide in the anode electrolysis process is dissolution and spallation of oxides. Mn-Mo-Ce oxide electrode has good durability in sea water, with a life time up to 1595 h, i.e. about 207 h higher than that of Mn-Mo oxide anode.

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    XPS Study on Hydrogen Sulfide Corrosion Products from Ferric Oxide
    Danhui WANG,Zhenhua ZHANG,Ping LI,Shanlin ZHAO,Fei LI
    Corrosion Science and Protetion Technology. 2017, 29 (3): 257-260.   DOI: 10.11903/1002.6495.2016.128
    Abstract   HTML   PDF (1018KB)

    Iron sulfide, a chemical of high pyrophorisity, may be produced through reaction of ferric oxide with hydrogen sulfide, which can be encountered during the crude oil processing. The chemical state of sulfur and iron in the as prepared iron sulfide and its oxidation products was characterized by means of X-ray photoelectron spectroscopy (XPS). The results show that sulfur exists in the as prepared iron sulfide as a component of pyrite, which then converts into sulfate after oxidation. The iron exists as a component of both pyrite and ferric oxide in the as prepared iron sulfide and the oxidized ones respectively.

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    Anti-corrosion Performance of Qtech-413 Viscoelastic Protective Materials Used as Coating for Light Rail Concrete Beam
    Ping LV,Yanzhu FENG,Weibo HUANG,Xiaoli ZhANG,Yanxuan MA
    Corrosion Science and Protetion Technology. 2017, 29 (3): 261-264.   DOI: 10.11903/1002.6495.2016.153
    Abstract   HTML   PDF (573KB)

    The anti-corrosion performance of Qtech-413 viscoelastic protective materials in sea water, 5%Na2SO4+5%NaCl solution, 1.5%H2SO4+1.5%HNO3 solution for different time were characterized through tensile test and FTIR inspection. The measured results after immersion in the three solutions for 100 d show that the tensile strength for Qtech-413 decreasesby 18.77%, 20.43% and 38.33%, while the relevante longation at break decreases by 15.64%, 18.28% and 11.39% in sea water, 5%Na2SO4+5%NaCl solution and 1.5%H2SO4+1.5%HNO3 solution respectively, however, its hardness changed little.FTIR inspection shows an appearance with features of little degradation on the Qtech-413 surface, but its chemical bonds and inherent structure did not damaged, which still shows good performance.

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    Stress Corrosion Cracking of HAl77-2 BrassHeat Exchange Tube
    Songliang LIU,Yaming ZHANG,Yonglian QIAO,Huijun LIU,Chaoliu ZENG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 265-270.   DOI: 10.11903/1002.6495.2016.299
    Abstract   HTML   PDF (6929KB)

    The case history of leakage of tubes of a heat exchanger was analyzed in terms of the corrosion morphology and the composition of corrosion products by means of metallographic microscope, SEM and EDX. The results show that the high concentration of ammoniacal nitrogen in the cooling medium plays an important role for the stress corrosion cracking of the heat exchange tube, while there exists residual stress in the transition zone between the tube with the expanded joint at the tube end. In addition, the HA177-2 brass itself is sensitive to media with higher concentration of ammoniacal nitrogen. Therefore, the stress corrosion cracking induced leakage of the HA177-2 brass could be ascribed to the presence of the residual stress and the corrosive medium to which HA177-2 brass is sensitive.

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    Analysis of Corrosion-induced Invalidation of L320 Steel Pipe in Long Distance Transmission of Natural Gas Pipeline
    Chuanbao GONG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 271-274.   DOI: 10.11903/1002.6495.2016.306
    Abstract   HTML   PDF (1311KB)

    The causes of leakage invalidation of a long-distance natural gas pipeline was analyzed. After excluding the mechanical damage and external factors, much emphasis was placed on the research on how corrosion and perforation could occur inside the pipeline. Various measures were taken to analyze the cause of corrosion and perforation, such as corrosion examination of coatings, chemical components analysis and microstructure observation of the pipe steel, detection of natural gas components and XRD analysis of corrosion products. The result showed that the occurrence of corrosion and perforation inside the pipeline was due to the synergistic action of oxygen corrosion, carbon dioxide corrosion and sulfate reducing bacteria corrosion. The air gathered inside after the pipeline was laid underground, carbon dioxide contained in natural gas during operation, water and dirt inside the pipeline, these played a critical role in the pipeline corrosion. To avoid further corrosion, several effective methods must be adopted, for instance, excavation and detection, replacing corroded pipe, impressed current method, pigging operation as well as internal inspection, using corrosion inhibitor, etc.

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    Preparation and Performance of GMA Modified Waterborne Alkyd Resin
    Zhiqin LI,Jinbo WEI,Mingliang YANG,Yali SU,Shuai FU,Daqing FANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 275-281.   DOI: 10.11903/1002.6495.2017.028
    Abstract   HTML   PDF (3508KB)

    Waterborne alkyd resin was prepared via molten salt process with soybean oil, benzoic acid, phthalic anhydride, trimellitic anhydride and trimethylolpropane as raw materials, and then modified with glycidyl methacrylate (GMA). The prepared alkyd resin was characterized by FT-IR, DSC and SEM. The result showed that the water absorption of the alkyd resin decreased after GMA modification. A kind of waterproof waterborne alkyd coating was prepared based on GMA modified alkyd resin, which can withstand a long term salt spray test up to 2000 h.

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    Research Status and Progress of Molten Salts Corrosion for Concentrated Solar Thermal Power
    Hua SUN,Xingzhi SU,Peng ZHANG,Jianqiang WANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 282-290.   DOI: 10.11903/1002.6495.2016.168
    Abstract   HTML   PDF (1056KB)

    The application and corrosion issues of molten salts in concentrated solar thermal power (CSP) were reviewed. The present state and progress in study of molten salt corrosion for salts of nitrate, Carbonate, chloride, fluoride and hydroxide were summarized. The main problems about the study of molten salt corrosion in CSP have been discussed. The coming possible research topics and directions in this area are also proposed.

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    Application of Techniques for Analysis of Biofilm Micro-environments on Pipe Corrosionin Water Distribution System
    Fan YANG,Nana WU,Haixue LIU,Nan WU,Baoyou SHI
    Corrosion Science and Protetion Technology. 2017, 29 (3): 291-300.   DOI: 10.11903/1002.6495.2016.166
    Abstract   HTML   PDF (2059KB)

    Pipe corrosion is one of the most important issues responsible to the safety of the water supply system in terms of transportation and distribution. Pipe corrosion is close related with the vital activity of microorganism in the water distribution system. The biofilm formed commonly on the inner wall of water distribution system plays a vital role on the corrosion occurred on the interfaces of aqueous phase/biofilm and biofilm/pipe substrate. Therefore, to study the dynamics of the corrosion process in combination with the structure and composition of the biofilm, and the microbial community structure in the biofilm related micro-environment is a useful way to reveal the pipe corrosion mechanism and develop corrosion protection measures. Herewith, several techniques for characterizing the biofilm related micro-environment were introduced,namely laser scanning microscopy, electron microscopy, atomic force microscopy, fourier transform infrared spectroscopy, raman spectroscopy and microelectrode techniques, which were rapidly developed in recent years,were introduced with emphasis on their advantages, disadvantages and application prospect in corrosion study. At last, future research direction for those techniques on pipe corrosion study have also been discussed.

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    Research Status of New-type Eco-friendly Zn-Al Alloy Coating
    Bin LIU,Zhifeng LIN,Xudong CHENG,Honglun WANG,Quanqiang REN
    Corrosion Science and Protetion Technology. 2017, 29 (3): 301-306.   DOI: 10.11903/1002.6495.2016.162
    Abstract   HTML   PDF (2418KB)

    The technology for chromium-free Zn-Al coatings was reviewed in terms of the corrosion mechanism and the formation mechanism of the protective film of Zn-Al alloy coatings. It focused also on the application of chromium-free Zn-Al alloy coatings by taking the traditional chromium-free coatings with mixed powder of Zn and Al as reference. Finally, the development trend of chromium-free Zn-Al alloy coatings was prospected.

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    Advances in Extracellular Electron Transfer Mechanism of Electrical Microbial Influenced Corrosion
    Ping XU,Yujia ZHAI,Fei GAO,Changzheng WANG,Yajun ZHANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 307-312.   DOI: 10.11903/1002.6495.2016.232
    Abstract   HTML   PDF (792KB)

    Electrical microbial influenced induced corrosion (EMIC) is recognized to be widespread in many environments related with such as water, oil, gas pipelines and marine engineering etc. Compared with other microbial corrosions, during the EMIC process the relevant microorganisms can directly capture electrons from metals, thereby which causes higher corrosion rate. In this paper, three kinds of extracellular electron transfer mechanisms of EMIC were summarized on the basis of introducing the electrochemical active microorganisms which can induce EMIC, and the relationship between EMIC extracellular electron transfer and microbial metabolism was discussed. The future direction in the research of EMIC was also pointed out.

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    Research Progress on Corrosion and Aging of Materials in Deep-sea Environment
    Weimin GUO,Mingxian SUN,Ri QIU,Jian HOU,Lin FAN,Kun PANG,Likun XU
    Corrosion Science and Protetion Technology. 2017, 29 (3): 313-317.   DOI: 10.11903/1002.6495.2016.288
    Abstract   HTML   PDF (1246KB)

    Luoyang Ship Material Research Institute (LSMRI) is the only institute in China to carry through the study on the corrosion of materials exposed in the deep sea environment. The institute has developed the key techniques related to the deep-sea test, such as low power standby design, optimization of the testing assembly, underwater force state analysis, and in situ corrosion monitoring. Using the near bottom suspension installation for the deep-sea test, LSMRI has successfully conducted the deep-sea corrosion tests in the South China Sea, and obtained fruitful data of corrosion and aging of over 40 materials deployed with different exposure periods. The tested materials include low alloy steel, stainless steel, copper alloys, aluminum alloys, titanium alloys, coupling components, non-metallic materials, organic coatings, metallic coatings, and fasteners. The number of acquired corrosion data is over 13000. LSMRI has also built the first database of deep-sea corrosion and aging of materials for the country. The relationship between the material corrosion and the environmental factors is also revealed. The basic data are of great significance for the development of deep sea equipment and structures.

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    Research and Development of Hydrogen Embrittlement of Pipeline Steel
    Hui FENG,Qiang CHI,Lingkang JI,He LI,Kun YANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 318-322.   DOI: 10.11903/1002.6495.2016.154
    Abstract   HTML   PDF (630KB)

    The present status on research and development of hydrogen embrittlement of pipeline steel was discussed by illustrating the hydrogen embrittlement phenomenon, influence factors, the relevant mechanism,and techniques for the study of hydrogen embrittlement. In the meanwhile some new technologies, which were adopted in other areas for characterizing the influence of hydrogen on the performance of materials, were introduced with the hope that such new technologies could be a good reference for the researchers and engineers in the study of hydrogen embrittlement of pipeline steel. Thus, precautionary solutions for hydrogen embrittlement of pipelines could be derived subsequently, so that to be beneficial to insure the safe operation of the pipelines.

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    Corrosion Survey for Field Joints of Long-distance Thermal Insulated Pipeline
    Youwen JIANG,Meng LIU,Wei ZHANG,Wei LAN,Jiannan GAI,Aiping REN,Yanhua JIANG
    Corrosion Science and Protetion Technology. 2017, 29 (3): 323-327.   DOI: 10.11903/1002.6495.2016.152
    Abstract   HTML   PDF (2979KB)

    A survey on corrosion of field joints for along-distance thermal insulated pipeline revealed that, the field joints exhibited clear tendency to corrosion damage due to the relatively poor quality of construction and the decay of sealing performance of their outer coating during long term service. The causes for the corrosion failure of coatings may be ascribed to that the ground water permeated into the insulating layer to produce the enclosed corrosion environment. The applied cathodic protection current could not reach the insulated metallic surface in sufficient quantity to establish adequate protection, and there also existed microbiological corrosion.

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    Analysis of Internal Corrosion Perforation of Electrical Insulating Devices for Cathodic Protection
    Xunji LI,Wenwen SONG,Lizhi ZHOU,Zhongqiang MAO,Peng TIAN
    Corrosion Science and Protetion Technology. 2017, 29 (3): 328-332.   DOI: 10.11903/1002.6495.2016.155
    Abstract   HTML   PDF (1298KB)

    The corrosion process of the electrical insulating device is revealed by examining the morphology, location, and perforation rate of the internal corrosion. The causes, the influence factors, and necessary and sufficient conditions required for the internal corrosion are analyzed by equivalent circuit method as well. Finally, the theoretical basis and the technical measures for the prevention of the internal corrosion perforation are put forward.

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