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

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Failure Analysis on Natural Gas Pipeline of 20 Steel and 16Mn Steel
The failure analysis for a natural gas pipeline, composed of pipes of 20 steel and 16Mn steel, was performed by means of examination of macro-morpholopy, metallograph, inclusion analysis as well as scanning electron microscope examination and chemical analysis for the relevant materials. Results sho. . .
Corrosion Science and Protetion Technology, 2018 Vol. 30 (2): 195-201    DOI: 10.11903/1002.6495.2017.115
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Study of Correlation of Aging Behaviour of Protective Coating on High-Strength Aluminum Alloy in Area with High Temperature and Humidity and Indoor Accelerated Environment PDF (335KB)
Corrosion resistance of polydopamine/hydroxyapatite composite coating on AZ31 magnesium alloy PDF (425KB)
Corrosion behavior of Ni and Ni-Dy alloys in molten LiCl-5 wt.% Li2O at 937 K PDF (1613KB)
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The study on high temperature oxidation resistance of Pt/Zr co-modified aluminide coating PDF (725KB)
Current Issue More>>
      20 May 2018, Volume 30 Issue 3 Previous Issue   
    Orginal Article
    Research Progress of Sulfate-reducing Bacteria Induced SCC
    Fuping XIONG, Junlei WANG, Abbas Fadhil AHMED, Chaoyang FU, Tingyue GU, Yulong HU, Hongfang LIU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 213-221.   DOI: 10.11903/1002.6495.2017.142
    Abstract   HTML   PDF (3391KB)

    Microbiologically influenced corrosion is one of the main hazards for buried pipelines,which is often initiating corrosion damages on the inner- and outer-surface of pipelines. The corresponding microorganisms are anaerobic sulfate-reducing bacteria (SRB) and aerobic iron oxidizing bacteria (IOB) etc. The pipeline is generally subjected to pressure, stray current, cathodic over-protection or absence of protection, as well as seasonally changing environmental factors during service. The synergy of these operation- and environment-factors with microbiological factors may lead to microbiologically influenced stress corrosion cracking (SCC), hydrogen induced cracking (HIC) or crevice corrosion and under-deposit corrosion induced by biomineralization on particular sites of pipelines, which seriously affect the safety of pipelines. This paper emphatically reviews stress corrosion cracking produced by synergistic effect of stress and SRB, as well as the relevant protective measures for ensuring the safe operation of pipelines.

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    Phosphate Process and Performance of Manganese Phosphate Film on Mg-alloy Mg-Gd-Y-Zr
    Haijing SUN, Kexiu CUI
    Corrosion Science and Protetion Technology. 2018, 30 (3): 222-228.   DOI: 10.11903/1002.6495.2017.149
    Abstract   HTML   PDF (3288KB)

    Phosphate film was prepared on Mg-alloy Mg-Gd-Y-Zr by chemical conversion process. The composition, pH value and temperature of the phosphate solution were adjusted based on orthogonal experiment design so that to acquire the phosphate film with outstanding anticorrosion performance. The electrochemical corrosion behavior of the phosphate film and the film formation mechanism were assessed by means of spot corrosion test, polarization curve measurement, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and X-ray diffractometer (XRD). It is found that the optimal formula of the solution composed of 50 g/L manganous dihydrogen phosphate, 40 g/L manganous nitrate (50% concentration), 4 g/L nickel sulfate, 2 g/L ethylene diamine tetra acetic acid (EDTA) and 3.5 g/L citric acid, while the pH value of the solution is adjusted to 2.2 and the phosphating process was conducted at 60 ℃ for 40 min. The phosphate film prepared by the optimal process has a smooth and dense surface with small grain size. The main components of the film are Mg- and Mn-oxides MgMnO3, Mg2MnO4 and Mg6MnO8, as well as crystal water containing-Mg3(PO4)2 and -MnHPO4. The phosphate film inhibits the corrosion tendency of the Mg-alloy and decreases its corrosion rate remarkably.

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    Compositional Optimization and Field Test of Al Alloys for Active Sacrificial Anode
    Qingyang GAO, Huanhuan WANG, Chunlin LI, Min DU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 229-236.   DOI: 10.11903/1002.6495.2017.172
    Abstract   HTML   PDF (2953KB)

    Novel Al-alloys containing Sn, Mg, In and Ga were designed and prepared aiming to develop active sacrificial anode materials with active solubility, more negative free corrosion potential and high current efficiency. By 4 d accelerated test and orthogonal experimental design, the optimal composition of the alloys was acquired. Results of measurements of polarization curves and electrochemical impedance spectrum (EIS) showed that the alloys presented characteristics of active solution for longer dipping time. Furthermore, the polarization potential, output current and current efficiency of the alloys were measured-by real sea testing. It follows that the alloys exhibited much negative polarization potential, bigger initial current and high current efficiency in case that the area ratios of cathode to anode were 50∶1, 100∶1, 200∶1 and 300∶1.

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    High Temperature Corrosion of Heat-resistant Materials in Carbon Dioxide Environment
    Zhiyuan LIANG, Miao YU, Yong GUI, Qinxin ZHAO
    Corrosion Science and Protetion Technology. 2018, 30 (3): 237-243.   DOI: 10.11903/1002.6495.2017.134
    Abstract   HTML   PDF (6915KB)

    Corrosion behavior of heat resistant materials, such as steels of 12CrMoV、T24、T91 and VM12, as well as superalloy Haynes 282, in carbon dioxide at 500, 600, 700 ℃ were investigated,while the corrosion products were characterized by means of Raman spectrometer and scanning electron microscopy. Results show that the corrosion kinetics of heat resistant steels followed parabolic law. The corrosion resistance of heat resistant materials can be ranked as follows: 282>VM12>T91>T24>12CrMoV, which indicates that the Cr content in materials decided its corrosion resistance in carbon dioxide environment. Oxidation- and carburization-reaction were the main corrosion types in high temperature carbon dioxide environment. The corrosion products formed on the steels were Fe2O3, Fe3O4, (Fe, Cr)3O4 and carbon effected zone from the gas-solid interface to the substrate. Finally, a mode for description of the high temperature carbon dioxide induced corrosion was put forward.

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    In vitro Degradation and Biocompatibility of Fe-35Mn Alloy Prepared by Spray Forming
    Han LI, Yexin WANG, Zhenshan CUI, Shanyong ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 244-250.   DOI: 10.11903/1002.6495.2017.193
    Abstract   HTML   PDF (4701KB)

    At present, the low degradation rate of ferroalloy seriously hinders its application in biodegradable medical implants. In order to improve the degradation rate, spray forming method was proposed to prepare biodegradable medical Fe-35Mn alloy. Then the degradation performance of the the sprayed Fe-35Mn alloy was examined by static immersion test and electrochemical corrosion test. The results demonstrated that the degradation rate of the sprayed Fe-35Mn alloy was obviously enhanced with rather uniform corrosion morphology. The cytotoxicity test indicated Mn alloying could improve the cytocompatibility of pure iron. So, spray forming can enhance the degradation performance of medical biomaterial Fe-35Mn alloy, while maintain its excellent biocompatibility, which is inseparable from the introduction of microvoids in this process.

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    Effect of Phytic Acid Dipotassium on Corrosion Performance of Epoxy Coating on Rust Q235 Carbon Steel
    Rongxiang WANG, Yawei SHAO, Yanqiu WANG, Bin LIU, Guozhe MENG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 251-258.   DOI: 10.11903/1002.6495.2017.185
    Abstract   HTML   PDF (3897KB)

    Epoxy coatings with different additives of phytic acid dipotassium were applied on rust carbon steel Q235. The corrosion performance and adhesive strength of coatings were assessed by means of electrochemical impedance (EIS) and spectroscopy adhesion measurement. The results indicated that phytic acid dipotassium could act as corrosion-inhibitor for the rust steel. The barrier effectiveness and adhesive strength of the epoxy coatings could be enhanced by the addition of phytic acid dipotassium in the epoxy. Among others, the epoxy coating containing 5%(mass fraction) phytic acid dipotassium had the best corrosion performance.

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    Influence of Nitrate Concentration on Corrosion of Reclaimed Water Pipe Network
    Yajun ZHANG, Jingjing LV, Lihua SUN, Qiwei ZHANG, Tingting DU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 259-265.   DOI: 10.11903/1002.6495.2017.229
    Abstract   HTML   PDF (1356KB)

    The effect of nitrate concentration on the corrosion of carbon steel in reclaimed waters were studied in terms of corrosion rate, iron release, corrosion product composition and the distribution of corrosion bacteria etc. by means of corrosion rate calculation, spectrophotometry and XRD, as well as bacteria detections with adenosine-triphosphate (ATP) and heterotrophic plate counts (HPCs). By comparison of results with four different concentration of C(NO3-): 0, 10, 100 and 1000 mg /L, it is found that nitrate has inhibition effect on the corrosion and iron release, and among others, the concentration of C(NO3-) 10 mg/L is the optimal, therewith the corrosion product α-FeOOH on carbon steel disappeared, while a dense corrosion scale formed, thus suppressing the corrosion. Meanwhile, due to the effect of nitrate concentration on the among of nitrifying bacteria, nitrogen reducing bacteria, iron oxidizing bacteria and acid-producing bacteria, thereby the formation of dense corrosion fouling, γ-Fe2O3 protective film and biofilm are all beneficial to the inhibition effect on the corrosion of carbon steel in the reclaimed water with C(NO3-) 10 mg/L.

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    Corrosion Resistance of Different Tube Coatings for Low-temperature Economizers
    Shuai WANG, Xin WU, Qingguo ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 266-272.   DOI: 10.11903/1002.6495.2017.138
    Abstract   HTML   PDF (5358KB)

    The corrosion performance of heat exchange tube of cupper without and with different coatings, such as Ni-P, Ni-P-Cu and polytetrafluoroethylene (PTFE) in simulated flue gas solution of 3.5% (mass fraction) NaCl+3.5% H2SO4 at 25 ℃ was studied by means weigh change methods,X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy spectrometer (EDX). It is found that the corrosion resistance of Ni-P and Ni-P-Cu coated tubes are superior to that of the plain copper tube, and among others PTFE coated tubes have the optimal corrosion resistance. Besides, the Ni-P and Ni-P-Cu coatings present partially amorphous (mainly amorphous structure) and fully amorphous structure respectively, while the later shows better corrosion resistance. In general, the PTFE coated heat exchange tube is the optimal choice for the low-temperature economizer in terms of corrosion resistance.

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    Oxidation Behavior of Al-Si Coating Modified TP347H FG in Saturated Steam at 650 ℃
    Yongli ZHOU, Jintao LU, Zhen YANG, Yingying DANG, Xinbao ZHAO, Jingbo YAN, Yong YUAN
    Corrosion Science and Protetion Technology. 2018, 30 (3): 273-278.   DOI: 10.11903/1002.6495.2017.166
    Abstract   HTML   PDF (5429KB)

    Al-Si coating was prepared on austenitic steel TP347H FG using slurry aluminizing process. The oxidation behavior of TP347H FG without and with Al-Si coating in saturated steam at 650 ℃ was studied by means of weight change method, scanning electron microscope and X-ray diffractometer (XRD), while taking high chromium HR3C alloy as reference. The results show that the oxidation resistance of the plain TP347H FG steel was poor, which formed bi-layered oxide scale with an outer layer of nodular-typed Fe3O4 and an inner layer of oxides FeCr2O4, whilst serious spallation of the outer oxide scale occured after oxidation for 1000 h. Al-Si coating significantly improved the oxidation resistance of TP347H FG steel, thus the Al-Si coated steel presented almost the same oxidation resistance as that of HR3C alloy, which can form a dense and continuous Cr2O3 oxide scale within a relatively short time in saturated steam at 650 ℃.

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    Initial Corrosion Behavior of Grounding Materials in Three Typical Soils in Shaanxi Province
    Yaoguo SU, Benling FANG, Pinghai LV, Cuiwei DU, De DING, Bei CAO, Lei LIU, Zhiyong LIU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 279-284.   DOI: 10.11903/1002.6495.2017.189
    Abstract   HTML   PDF (6399KB)

    The initial corrosion behavior of two grounding materials, i.e. carbon steel Q235 and copper plated steel was investigated in soils of three selected test sites (i.e. Qianyang-, Jingbian- and Yichuan-districts) in Shanxi Province by means of macro-morphology examination, pit depth measurement, SEM, EDS and Raman Spectrum. The results of 5-month burying test show that the corrosion resistance of the copper plated steel in the three soils is better than that of Q235 carbon steel. According to the corrosion rates of Q235 steel in soils, the corrosivity of the three soils can be ranked as follows: Qianyang district>Jingbian district>Yichuan district. While the corrosion mechanism in the three soils were similar. The corrosion products of Q235 steel composed mainly Fe2O3, FeOOH and Fe3O4, but that of the copper plated steel were mainly Cu2O and CuCO3Cu(OH)2.

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    Effect of Chloride Ion Concentration on Corrosion Resistance of Nickel-based Alloy 718 in H2S and CO2 Containing Environment
    Rui ZHANG, Chenliang RUAN, Huibo YIN, Dapeng LI, Hongqian LIAO, Minxu LU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 285-290.   DOI: 10.11903/1002.6495.2017.175
    Abstract   HTML   PDF (4891KB)

    Nickel-based alloy 718, as a metallic material for downhole-tools and -facilities, is commonly used in high acid oil and gas wells. In this paper, the effect of chloride ion concentration on the corrosion behavior of nickel-based alloy 718 in a simulated corrosion environment with high H2S/CO2 partial pressure at high temperature and high pressure was studied by means of weight loss measurement, scanning electron microscopy (SEM) and X-ray energy spectrum analysis (EDS). The results show that in high acidic environment with 3.5 MPa partial pressure of CO2 and H2S respectively at 205 ℃, the corrosion rate increases with the increase of chloride ion concentration and the pitting susceptibility is significantly increased as well. When the chloride ion concentration reaches to 180 g/L, the surface of the nickel-based alloy 718 begins to suffer from pitting corrosion. Pitting corrosion originates from sulfureting induced damages of the surface passivation film, once the chloride ion concentration reaches a critical value and passes through the passivation film, the pitting corrosion may initiate. Although the stress corrosion cracking did not occur at chloride ion concentration of 200 g/L, however, groove-like pitting occurred when it reaches to 180 g/L, which may be the risk of stress corrosion cracking for long-term service.

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    Passivation Behavior of Ductile Iron in Simulated Cement-mortar Pore (SCMP) Solution with Different pH Value
    Wenyun HUANG, Xiaobao ZUO, Guangji YIN, Shuai ZOU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 291-296.   DOI: 10.11903/1002.6495.2017.165
    Abstract   HTML   PDF (1190KB)

    The passivation behavior of ductile iron in the simulated cement-mortar pore (SCMP) solution with different pH value was evaluated by Tafel polarization (TP), electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS), while the influence of pH value of SCMP solution on the stability and chemical compounds of passive film formed on the surface of ductile iron was analyzed. Results show that, the pH value of the SCMP solution is the main factor influencing the formation of passive film on the surface of ductile iron. When its pH value is above 12.5, a stable passive film can form on the surface of ductile iron, and the time of passive film formation increases with the decrease of pH value, while the corrosion potential, charge-transfer resistance (Rct) and electric capacity (Qdl) are stable, but in the SCMP solution with pH of 11.5, the passive film cannot form on the surface of ductile iron. The main chemical compounds of the passive film are FeO, Fe2O3 and FeOOH, and the ratio of Fe2+/Fe3+ increases with the pH value; the higher Fe2+/Fe3+ ratio can provide the passive film with higher stability, which results in higher corrosion resistance of ductile iron.

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    Effect of WC/Co Content on Corrosion Behavior of Nanocomposite Coatings of Ni-WC/Co
    Wanglin GUI, Ji CHEN, Xiao CUI
    Corrosion Science and Protetion Technology. 2018, 30 (3): 297-301.   DOI: 10.11903/1002.6495.2017.132
    Abstract   HTML   PDF (1016KB)

    Nanocomposite coatings of Ni-WC/Co were prepared by pulsed electrodeposition. The effect of WC/Co content on the crystallographic structure, grain size and hardness, as well as the electrochemical corrosion behavior in 3.5% (mass fraction) NaCl solution of the coatings were investigated. Results show that with the increase of WC/Co content in the plating bath in a range of 0~50 g/mol, the average grain size of the composite coatings decreases first and then increases, while their hardness and corrosion resistance increases first and then decreases respectively. Among others, the prepared coating with the bath containing 30 g/L WC/Co, showed the smallest average grain size, the highest hardness and the best corrosion resistance.

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    Research Status of Vapor Deposition Technology for Making Coatings on Mg-alloys
    Jiao XIONG, Anshan YU, Hualan JIN, Xiangjie YANG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 302-310.   DOI: 10.11903/1002.6495.2017.157
    Abstract   HTML   PDF (4135KB)

    The advantages and disadvantages of the surface coating technologies for Mg-alloys and the research status of vapor deposition technology are reviewed in this article, especially the physical vapor deposition (PVD) and chemical vapor deposition (CVD) are mainly concerned. The application of atomic layer deposition (ALD) technique to the surface treatment of Mg-alloy was also put forward. Finally, the problems of vapor deposition technology are pointed out, and the development trends of surface treatment technology for Mg-alloys are discussed.

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    Recent Advances in Testing and Risk Assessment of AC Interference with Buried Piplines
    Dezhi TANG, Yanxia DU, Minxu LU
    Corrosion Science and Protetion Technology. 2018, 30 (3): 311-318.   DOI: 10.11903/1002.6495.2017.171
    Abstract   HTML   PDF (969KB)

    The matter of AC interference with buried pipelines from overhead power lines or AC electric traction systems has attracted much attention in recent decades. However, the testing technologies and risk assessment methods have not been well-understood. In this work, the latest acquisition on effective measurements of AC interference parameters, such as AC voltage, AC current density and real polarization potential of the interfered-pipelines, was reviewed. Also, AC risk assessment methods were summarized. After that, current problems in AC parameters measurements and AC risk assessment were discussed. Finally, several comprehensive suggestions were proposed for the future research.

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    Research Progress of Hg Induced Corrosion
    Yanling LI, Hong JIANG, Xiaoyu CHEN
    Corrosion Science and Protetion Technology. 2018, 30 (3): 319-323.   DOI: 10.11903/1002.6495.2017.159
    Abstract   HTML   PDF (1080KB)

    This paper discusses the mechanism of elemental Hg induced corrosion of Al, Cu, carbon steel and alloyed steel. The mechanism of elemental Hg induced corrosion of metals may involve amalgamation-corrosion and liquid metal embrittlement. Hg induced corrosion of Al is typical synergy of amalgamation corrosion and liquid metal embrittlement. Hg induced corrosion of Cu is mainly liquid metal embrittlement. Carbon steel is not easily corroded by Hg. The sensitivity to Hg induced embrittlement of alloyed steels varied due to their different alloying elements. Titanium is not easy to be embrittled by Hg. Cu-Ni alloy is easily embrittled by Hg, but high-phosphorus containing Cu-Ni alloy can resist Hg induced embrittlement. Hg induced corrosion mainly involves two aspects: first, the replacement reaction led to dissolution of active metal, and second, elemental Hg can form via reduction of Hg ions on the metal surface resulting in elemental Hg corrosion. On the other hand, methylmercury can easily decompose to release elemental Hg and mercury salt, which then attack metals.

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    Review of Downhole Tubing Corrosion of Water/Gas Injection Well and Anti-corrosion Measures
    Pengli GE, Gang LIN, Xiaolong ZHANG, Shuhong GAO, Wenwen XIAO, Anqing FU, Zhihong ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 324-330.   DOI: 10.11903/1002.6495.2017.273
    Abstract   HTML   PDF (3675KB)

    The corrosion status of downhole tubings for water- and gas-injection wells in China was reviewed. Anti-corrosion technologies including metallic coating, non-metallic coating, nonmetallic liner, chemical treatment, nitriding treatment, and sacrificial anode were systemically analyzed. Finally, the future development trend and evaluation methodology of antic-corrosion measures for water- and gas- injection wells were discussed.

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    Review on Research Progress of Technologies for Corrosion Protection and Monitoring of Grounding Grid of High Voltage Transformer Substation
    Nanzhan FENG, Zhizhong LI, Hengte LI, Yafeng LI, Yiliang YU, Yingqi LI, Zehua DONG
    Corrosion Science and Protetion Technology. 2018, 30 (3): 331-338.   DOI: 10.11903/1002.6495.2017.248
    Abstract   HTML   PDF (686KB)

    Grounding grid of high voltage transformer substation often suffer from severe soil corrosion, leading to increasing risk of tripping for power supply equipment and resulting in large-scale blackouts. In this paper, we reviewed the research progress on service safety and anti-corrosion of the underground steel grid of high-voltage transformer substation, including the material selection of grounding grid, anti-corrosion methods and non-destructive corrosion monitoring techniques. In addition, the types of corrosion and the main influence factors relevant to the grounding grid, as well as the advantages and disadvantages of different corrosion inhibition methods are also concerned. As an efficient evaluation measurement, several methods of defect diagnosis and corrosion monitoring techniques used in grounding grid are also reviewed. Finally, we prospect for the development about the health diagnosis methods of grounding grids, as well as the anti-corrosion strategy.

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