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 behavior of Mg96.8Gd2Zn1Zr0.2 (at.%) alloy processed by ECAP PDF (472KB)
2018-01-03
Internal Corrosion Cause Analysis of a Products Pipeline before Commissioning PDF (5504KB)
2018-01-03
Pitting corrosion of several super stainless steels in the simulated desalination environment of low temperature multi effect PDF (3283KB)
2018-01-03
Influence of pH value on pitting corrosion behavior of 304 stainless steel used in high salinity wastewater PDF (1140KB)
2018-01-10
Research progress of MEA capture CO2 corrosion PDF (641KB)
2018-01-03
Current Issue More>>
      10 December 2017, Volume 29 Issue 6 Previous Issue   
    Performance of a New Type Polyester Modified Acrylic Polyurethane Coating
    Qingfei MA, Hui HE, Lin JIANG, Qingchang WEN, Xiaolin WEI, Xingyue YONG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 591-596.   DOI: 10.11903/1002.6495.2017.004
    Abstract   HTML   PDF (2038KB)

    The corrosion process and failure mechanism of a new type polyester-modified acrylic polyurethane organic coating in simulated marine environment were studied by accelerated-test. The results show that the gloss loss rate of the polyester-modified acrylic polyurethane coating increased with the accelerated-test cycles. Before and after accelerated-test its adhesion was not obviously changed. During the test, the porosity of the coating gradually increase with time, resulting in the increment of its dielectric constant because of the penetration of the corrosive media into the coating. Finally, the electrochemical impedance decreased with the accelerated-test cycles. However, the electrochemical impedance kept about 108 Ωcm2 after the coated specimens was subjected to eight-cycle acceleration test. It was demonstrated that this coating had better corrosion-resistance and stronger adhesive strength.

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    Corrosion Inhibition of 2-mercaptopyrimidine for Cold Rolled Steel in Citric Acid Solution
    Shuduan DENG, Xianghong LI, Guanben DU
    Corrosion Science and Protetion Technology. 2017, 29 (6): 597-602.   DOI: 10.11903/1002.6495.2016.298
    Abstract   HTML   PDF (903KB)

    The inhibition of 2-mercaptopyrimidine (MP) on the corrosion of cold rolled steel in 0.2 mol/L citric acid (H3C6H5O7) was studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The results show that MP acts as a good inhibitor, and the inhibition efficiency increases with the increase of inhibitor concentration and temperature. The adsorption of MP on the steel surface follows Langmuir isotherm, and is an endothermic process accompanied with the increase of entropy. MP acts as a mixed-type inhibitor, and the inhibition effect may be ascribed to geometry blocking-effect. EIS spectra exhibits the depressed capacitive loop with only one time constant, and the charge transfer resistance increases with the concentration of MP.

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    Microstructure Characterization of Oxides Formed on Stainless Steel with Attachments of Fe-Zn Intermetallics in High Temperature Water
    Yan ZHAO, Jianjun GUAN, Feng LIU, Ping LIANG, Congqian CHENG, Jie ZHAO
    Corrosion Science and Protetion Technology. 2017, 29 (6): 603-608.   DOI: 10.11903/1002.6495.2016.301
    Abstract   HTML   PDF (3633KB)

    The corrosion behavior of 304 stainless steel with attachments of Fe-Zn intermetallics was investigated in high temperature water. The microstructure of oxide scales was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and synchrotron radiation-grazing incidence X-ray diffraction (SR-GIXRD). The influence of the attachment of Fe-Zn intermetallics on the corrosion performance of 304 stainless steel was discussed. The results show that tiny Fe2O3 oxides and nubbly or sheet-like Fe3O4 particles grow on the stainless steel surface after corrosion in 300 ℃ water. When the stainless steel with the attachment of Fe-Zn intermetallics is corroded in high temperature water, the Fe-Zn intermetallics could transform into ZnO oxides gradually with time, while the formed oxide scales gradually spalled off resulting in the increment of mass loss. When the corrosion time increases to 360 and 480 h, the tiny Fe2O3 oxides are observed, while the mass loss has little change. The thin Fe2O3 oxide film can be characterized using SR-GIXRD instead of XRD.

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    Effect of σ Phase on Selective Corrosion of 2205 Duplex Stainless Steel
    Yingxi LV
    Corrosion Science and Protetion Technology. 2017, 29 (6): 609-614.   DOI: 10.11903/1002.6495.2017.081
    Abstract   HTML   PDF (6456KB)

    The microstructure,corrosion resistance properties and corrosion morphology of the 2205 duplex stainless steel aged at 850 ℃ for different time were characterized by means of optical microscope and scanning electron microscope, as well as potentiodynamic polarization measurement and electrochemical impedance spectroscopy. The result showed that: the trace amount of σ phase-precipitates is not obvious harmful to the corrosion resistance of the steel; however, with the increasing σ phase precipitation, it is difficult to form stable passivation film on the steel surface, thus its corrosion resistance decreases obviously; the corrosion pits firstly appeared at the interface of σ phase and matrix, and then expanded to ferrite phase. Besides that, σ phase could also change the electrochemical corrosion morphology characteristics, i.e. the morphology of pits changed from hemispherical pit to seriously destroyed pit with small mouth but large cavity, then transformed into wide- and shallow-bowl like pit.

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    One-step Preparation and Corrosion Behavior of Polydopamine Coatings on Mg-alloy AZ31
    Guofei QIU, Xuan ZHAO, Xiaoming JIA, Wei RONG, Xiaohong LIANG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 615-620.   DOI: 10.11903/1002.6495.2017.017
    Abstract   HTML   PDF (2315KB)

    Polydopamine coatings were applied on Mg-alloy AZ31 through immersion the alloy into appropriate solutions of polydopamine for a period of time. The surface morphology, chemical composition and adhesive strength to the substrate of coatings were characterized by SEM and AFM, XPS and tensile test respectively. Then their corrosion performance in a simulated body fluid (SBF) solution was assessed by means of potentiodynamic polarization curves. Results demonstrate that the coating showed not only compact structure, but also high bonding strength; the prepared polydopamine coatings can effectively protect the Mg-alloy from corrosion in the simulated body fluid. The approach presented here would be a simple and effective alternative for Mg-alloy surface modi?cation.

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    Effect of Temperature on Cracking of Cr2O3 Oxide Scale of Super304H Alloy
    Hao LI, Dongqiang GAO, Zhen YANG, Jingbo YAN, Wu LIU, Chuanzhi ZHU
    Corrosion Science and Protetion Technology. 2017, 29 (6): 621-627.   DOI: 10.11903/1002.6495.2017.039
    Abstract   HTML   PDF (5933KB)

    The formation of an intact and dense Cr2O3 scale on the surface of super304H alloy has important influence on its oxidation resistance. It has been found that temperature has a significant effect on the stability of the Cr2O3 scale on super 304H alloy during the steaming process at 620~650 ℃. During oxidation at 620 ℃, the formed Cr2O3 scale covered the matrix completely, while microcracks occurred on the surface of Cr2O3 scale for long term, which facilitated the formation of nodular Fe3O4. When the oxidation temperature reaches 650 ℃, the growth rate of Fe3O4 increased obviously and finally covered the whole alloy surface.

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    Research on Industrial Application of Corrosion Monitoring Technology Based on Field Signature
    Bin PANG, Shengli JIANG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 628-932.   DOI: 10.11903/1002.6495.2017.049
    Abstract   HTML   PDF (1698KB)

    The article has compared the results measured by field signature method (FSM) and ultrasonic thickness method respectively, whilst a trial industrial application of FSM was carried out for corrosion monitoring of a gathering line. The results show that the thickness of the pipeline wall measured by FSM is credibility and consistent with that by ultrasonic. The corrosion tendency of most parts of the pipeline in the monitoring range is very small, and the maximum corrosion sites of pipeline are random in different periods; and of which the majority occurred on the lower parts of the pipeline. Finally, suggestions for further applications of FSM in corrosion monitoring and corrosion detection are put forward.

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    Corrosion Failure Analysis of Al-alloy Flange in Current Transformer for Power Sub-station
    Wenkui HAO, Bingkun YANG, Yun CHEN, Guang MA, Xielin SHEN, Deyuan LIN, Xin CHEN, Yunxiang CHEN
    Corrosion Science and Protetion Technology. 2017, 29 (6): 633-639.   DOI: 10.11903/1002.6495.2017.135
    Abstract   HTML   PDF (5483KB)

    The actual corrosion failure of Al-alloy flanges of pressure relief diaphragm for current transformer (CT) in a coastal power sub-station was investigated in terms of the composition analysis of the failure Al-alloy flange, corrosion morphology observation and analysis of corrosion product as well as the survey of actual service environment characteristics and the examination of electrochemical corrosion behavior the alloy. The results show that the corrosion and stress corrosion cracking (SCC) of the Al-alloy flange of CT pressure release diaphragm did occur in the coastal industrial environment, the corrosion products are mainly aluminum chloride. Cl- and S2- are important environmental factors that cause corrosion failure, and the synergy of Cl- and stress lead to SCC of the Al-alloy flanges. Therefore, flanges should be made of Al-alloys with good resistance to Cl- and S2- induced corrosion as well as to SCC. In addition, the surface anti-corrosion measures should be strengthened. Furthermore, it follows that Al-alloy 7A05 should not be adopted for making the flange in the absence of appropriate protective measures.

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    Rsearch Progress on Application of Graphene for Anti-Corrosion Coatings
    Shengrong WANG, Jianping CAO, Jianwei YANG, Lijun GAO
    Corrosion Science and Protetion Technology. 2017, 29 (6): 640-644.   DOI: 10.11903/1002.6495.2017.026
    Abstract   HTML   PDF (674KB)

    Graphene modified coatings possess advantages such as long-term high temperature resistance, good weather ability as well as good resistance tosalt-spray fog aging, acid, alkali and light agingetc. Graphene can be used to improve the impact resistance, friction resistance, thermal conductivity,weathering resistance and corrosion resistance of coatings used in a variety of extreme environments. In this paper, the properties of graphene, the preparation methods of graphene coatings, the mechanism of anticorrosion and the application of graphene anticorrosion coatings are reviewed.

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    Influence of Environment and Coating Defects on AC Corrosion of Pipeline Steel
    Yingwu XIAO, Yanxia DU, Li OU, Haiming SUN
    Corrosion Science and Protetion Technology. 2017, 29 (6): 645-650.   DOI: 10.11903/1002.6495.2017.014
    Abstract   HTML   PDF (1862KB)

    Researches for the effect of environment and coating defects on AC corrosion of pipeline steel were summarized. The environmental factors include anions and cations, pH, soil resistivity, temperature, while coating defects e mainly concern their size and shape. Based on the researches status, the existing problems and possible research directions were analyzed, which could enrich the knowledge of AC corrosion, and provide reference for the study of AC corrosion mechanism and the establishment of the criterion of AC corrosion.

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    Corrosion-detection and Assessment Methods for Abradable Sealing Coatings
    Bing LEI, Shengnan HU, Zuhua WANG, Ying LI, Fuhui WANG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 651-656.   DOI: 10.11903/1002.6495.2016.172
    Abstract   HTML   PDF (2770KB)

    Assessment methods of performance for abradable sealing coatings, especially those related with corrosion detection and corrosion-assessment were reviewed. The indexes of wear resistant ability and anti-erosion are sensitive parameters to presenting the overall corrosion performance, therefore can be adopted as comprehensive assessment indexes. Thus, single pendulum impacting scratch test and sand slurry erosion test are considered assuitable lab test methods, while the consumed energy and mass loss are sensitive parameters for the assessment of wear and erosion resistance of abradable sealing materials respectively. Finally, topics of further study in the field are also pointed out.

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    Research Progress on Corrosion and Protection of Welded Joints of Pipeline Steels
    Rui CAO, Yun DING, Xiaokang ZHAO, Weiqiang ZHONG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 657-663.   DOI: 10.11903/1002.6495.2017.038
    Abstract   HTML   PDF (659KB)

    The current status of the study on corrosion behavior of welded joints of pipeline steel was reviewed, while the corrosion testing methods including stress corrosion test, salt spray test, immersion test and electrochemical test were discussed in detail in terms of their advantages and disadvantages as well as the range of application for each method. At the same time, the research progress on corrosion of welded joints of pipeline steels such as stress corrosion, salt spray corrosion and CO2 corrosion as well as the relevant mechanism were introduced. The methods for improving the corrosion resistance of welded joints of pipeline steels were also summarized.

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    Influence of Biofouling on Performance of Marine Monitoring Instruments and Anti-biofouling Technique
    Xiangfeng KONG, Yuanqing JIANG, Jing ZHANG, Jing LV, Dongzhi CHU, Yan ZOU, Xin PENG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 664-668.   DOI: 10.11903/1002.6495.2017.099
    Abstract   HTML   PDF (644KB)

    Marine instruments are important tools for marine related investigation, research, development, environmental protection and other marine activities. The characteristics and quality of marine instruments may directly affect the quality and benefit of these activities. Marine biofouling does greatly damage marine monitoring instruments and has a substantial and widely dispersed impact on the instrument performance. Since the maintenance cycle of most marine monitoring instruments is usually from 10 d to 60 d. Marine biofouling has been a major factor in restricting the application of marine instruments. This article introduced the influence of biofouling on the performance of marine monitoring instruments, and also summarized methods for anti-biofouling of the marine monitoring instruments. In the end, the necessity and prospect of anti-biofouling measures for marine monitoring instruments were also discussed.

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    Development and Application of Corrosion Resistance Probe Monitoring Technology
    Fengqin CHEN, Dongmei FU, Ke ZHOU, Junwei WU, Cuiwei DU, Yuangang LIU
    Corrosion Science and Protetion Technology. 2017, 29 (6): 669-674.   DOI: 10.11903/1002.6495.2016.300
    Abstract   HTML   PDF (1276KB)

    The development of resistance probe corrosion monitoring technology in recent decades was comprehensively reviewed. The principles and the development process of the technology were mainly introduced, with the relevant products. The characteristics and performance of different brand products were compared and analyzed. The applications of the resistance probe in the field of industry corrosion monitoring were summarized, as well as the situation and demand of the resistance probe technology applications in the domestic market. Finally, based on the comparison of the resistance probe development and application domestically and overseas, we predicted the development space and put forward the development trends of the resistance probe technology in domestic market.

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    Detecting Corrosion Induced Damage Within Bearing with Infrared Thermal Imaging Technology
    Chunhua WANG, Xuan ZHANG, Qiang ZHANG, Tong GUO
    Corrosion Science and Protetion Technology. 2017, 29 (6): 675-679.   DOI: 10.11903/1002.6495.2016.309
    Abstract   HTML   PDF (3132KB)

    In order to detect corrosion-induced damages in an operating bearing, the real time temperature field image of which was obtained by using infrared thermal imager. By comparison the theoretical image of bearing temperature field with the measured one, the abnormal areas on the temperature field images could be differentiated, which then may be considered as the locations of the corrosion-induced damage within the bearing. The feasibility of bearing temperature field image for detecting the groove-like corrosion induced damages within the bearing is finally confirmed by results of comparative experiments.

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    Research on Corrosion Diagnosis of Motor Stator Windings Based on Infrared Thermal Imaging Technology
    Qiang ZHANG, Tong GUO, Yi LIU, Xuan ZHANG, Haijian WANG
    Corrosion Science and Protetion Technology. 2017, 29 (6): 680-686.   DOI: 10.11903/1002.6495.2016.294
    Abstract   HTML   PDF (1939KB)

    A motor load test rig was set up for the study of accurate diagnosis of corrosion defects appeared in motor stator coil. With the test rig, the infrared thermal images of a three-phase asynchronous motor under different operation conditions are shot by infrared thermography. The temperature field data and the temperature-frequency curve of the motor stator coil are obtained. By analyzing the data, the defects and insulation changes in the stator winding of the motor induced by corrosion may be acquired in terms of the relevant infrared characteristic and the temperature field variation regulation. The experimental results show that the proposed technique can be used to diagnose whether the stator coil of the three-phase asynchronous motor did suffer from corrosion or not. The results provide a direct and effective method for the fault diagnosis and prediction of stator coils.

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    Analysis on Corrosion Induced Leakage of Low Oil Heat Exchanger in Diesel Hydrogenation Unit
    Hongjie MA
    Corrosion Science and Protetion Technology. 2017, 29 (6): 687-690.   DOI: 10.11903/1002.6495.2017.015
    Abstract   HTML   PDF (1665KB)

    An analysis on corrosion induced leakage of low oil heat exchanger in reaction system of hydrogenation unit for coker diesel and catalytic diesel was conducted by means of visual inspection, SEM with EDS and XRD. Results indicated that the corrosion products was ferrous sulfide,and the corrosion type was wet hydrogen sulfide corrosion. The primary cause was that there existed deficiencies in the design of the impingement plate of tube bundle,in this case low oil flowing slowly and hydrogen sulfide gathering, so the tube bundle near the impingement plate was subjected to wet hydrogen sulfide corrosion. Furthermore,with the increasing temperature the reaction activity of hydrogen sulfide of the low oil in heat exchanger increased, thereby the corrosion reaction was accelerated. Finally, the prevention measures were put forward with special emphasis on the improvement of construction for the impingement plate.

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