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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Failure Analysis on Natural Gas Pipelines of 20 and 16Mn Steels PDF (799KB)
2017-10-19
Development of Erosion-corrosion Resistant Steel for Dredging and the Research of Erosion-corrosion Resistance PDF (283KB)
2017-10-19
Influence of Al Content on Corrosion Resistance of Mg-xAl-2Ca-2Nd Alloy PDF (1374KB)
2017-10-19
Electrochemical Corrosion Behavior of 254SMo Stainless Steel in Simulated Condensate of Blast Furnace Gas PDF (344KB)
2017-10-19
Synergistic Effect of Sulfadiazine and Sodium Thiocyanate for Q235 Steel in Sulphuric Acid Medium PDF (659KB)
2017-10-16
Current Issue More>>
      25 October 2017, Volume 29 Issue 5 Previous Issue    Next Issue
    Corrosion Evaluation of Cement Mortar Lining in High Quality Reclaimed Water Pipes
    Rufang ZHANG, Yimei TIAN, Bo ZHENG, Yarong SONG, Hanchao LU
    Corrosion Science and Protetion Technology. 2017, 29 (5): 469-475.   DOI: 10.11903/1002.6495.2017.053
    Abstract   HTML   PDF (1767KB)

    Corrosion performance of cement mortar lining of reclaimed water pipe network in high quality reclaimed water was assessed in terms of water quality stability index, which was adopted to assess the corrosivity of the yielding water of reclaimed water plant, while four parameters of water, such as alkalinity, hardness, Cl- and SO42- were selected to design the four-factor three-level orthogonal test. Besides, the corrosion morphology of the lining was also characterized by means of SEM and other micro-morphology analysis methods. The results show that: (1) the reclaimed water with poor quality stability can be corrosive to the cement mortar lining; (2) the impact of the four parameters on the corrosion of cement mortar lining can be ranked as: hardness>Cl->alkalinity>SO42-; (3) the impact on the corrosion of cement mortar lining of hardness and Cl- are relatively significant, that of alkalinity is not obvious, while that of SO42- is little; (4) the corrosion is more serious when the high alkalinity (HCO3-) and low hardness exist simultaneously.

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    Pitting Corrosion Resistance of Ag-bearing Duplex Stainless Steel
    Qing SI, Hongliang XIANG, Dong LIU
    Corrosion Science and Protetion Technology. 2017, 29 (5): 476-484.   DOI: 10.11903/1002.6495.2016.248
    Abstract   HTML   PDF (5494KB)

    Ag-bearing antibacterial duplex stainless steels were prepared by adding Cu-Ag alloy particles into the master alloy of CD4MCu. The microstructure and Ag-rich phase of the steels after solution treatment at 1150 ℃ were characterized by SEM, XRD and EDS. The pitting corrosion resistance of the steels in different solutions was assessed by electrochemical means in comparison with CD4MCu duplex stainless steel. The results indicated that the Ag-rich phase of Ag-bearing steels can not be fully dissolved into the matrix so that the physical and chemical properties of the steel surface are not consistent; the pitting corrosion resistance of the Ag-bearing steels differs from the CD4MCu to some extent in different solutions. In comparison with the CD4MCu, The Ag-bearing steel exhibits lower pitting corrosion resistance, higher corrosion current density and weaker stability of the formed passive film in 3.5%NaCl solution and sterile liquid culture medium. In the contrast, which exhibits better resistance, lower corrosion current density and higher stability of the formed passive film in Cl- containing 30% acetic acid solution and Escherichia coli solution respectively.

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    Corrosion Behavior of Q235 Steel in Sour Water
    Jidong WANG, Xu CHEN, Zhibin WANG, Yugang ZHANG
    Corrosion Science and Protetion Technology. 2017, 29 (5): 485-491.   DOI: 10.11903/1002.6495.2016.265
    Abstract   HTML   PDF (1330KB)

    Corrosion behavior of Q235 steel in solutions with different concentrations of S2-, Cl- and NH4+ was studied by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization technology etc. It is found that the anodic polarization process of Q235 steel was passivatedin the solution with NH4+ or S2-, and it was actively polarized in the solution with Cl-. The corrosion current density of Q235 steel increased with the increasing concentration of Cl- or NH4+, but it decreased with the increasing concentration of S2-. The protective passivation film formed on Q235 steel in the alkaline sulfide environment. The Cl- and S2- were adsorbed at the defect of the passive film and there with the formation of the passive film was blocked, which resulted in the steel being activated under the film and the corrosion process was accelerated.

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    Corrosion Behavior of Micro-arc Oxidation Coatings Formed on 6063 Aluminum Alloy
    Junjie ZHUANG, Renguo SONG, Nan XIANG, Junpeng LU, Ruoxi SONG, Ying XIONG
    Corrosion Science and Protetion Technology. 2017, 29 (5): 492-498.   DOI: 10.11903/1002.6495.2016.255
    Abstract   HTML   PDF (2885KB)

    Micro-arc oxidation (MAO) coating was prepared on Al-alloy 6063 in a borate- and silicate-based alkaline solution. The microstructure and electrochemical corrosion behavior of the borate-based MAO coating were investigated by scanning electron microscopy (SEM), potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS). The results showed that the silicate-based MAO coating was of densification compared with that of borate-based MAO ones. There existed higher amount of phase Al9Si in the silicate-base MAO coating rather than in the borate-based MAO coating. The corrosion results indicated that the silicate-based MAO coating could provide superior protection for the Al-alloy 6063, while the borate-based MAO coating was of porous structure with inferior corrosion resistance. Furthermore, the EIS tests proved that the two coatings all showed appropriate corrosion resistance in 0.5 mol/L NaCl solution. However, the borate-based MAO coating could not provide sufficient protection for the Al-alloy 6063 after 72 h immersion in 1 M NaCl solution.

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    Corrosion Behavior of Al-alloy 6082-T6 in Simulated Marine Atmospheric Environment
    Deyuan LIN
    Corrosion Science and Protetion Technology. 2017, 29 (5): 499-506.   DOI: 10.11903/1002.6495.2017.120
    Abstract   HTML   PDF (6017KB)

    The corrosion behavior of Al-alloy 6082-T6 in a simulated marine atmospheric environment was investigated by salt spray tester. Results showed that the relationship between the corrosion mass loss and corrosion time followed the power exponential equation: D=0.44t 0.45. At the initial corrosion stage, pitting corrosion occurred by the action of Cl-, then corrosion product gathered and stacked gradually and as a result, the pitting corrosion turned to be general corrosion. With corrosion time going by, the corrosion product layer became thick and compact. When corrosion time was between 20~30 d, the outer corrosion product layer was thin and loose because the dissolution played the dominant role. With the increasing corrosion time, the outer corrosion products became compact stacks of flakes, while Icorr underwent increasing firstly, decreasing next, then increasing and finally decreasing again. In the meantime, capacitive reactance arc experienced shrunking firstly, expanding next, then shrunking and finally expanding again.

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    Corrosion Behavior of Al-alloys 3A21, 5A05 and 6063 in Low-conductive Ethylene Glycol Coolant
    Tianliang ZHAO, Liangjuan ZHANG, Jiyu QIAN, Zixuan PENG, Cuiwei DU, Xiaogang LI
    Corrosion Science and Protetion Technology. 2017, 29 (5): 507-514.   DOI: 10.11903/1002.6495.2016.281
    Abstract   HTML   PDF (4447KB)

    As a substitute of theconventional ethylene glycol coolant, low-conductive ethylene glycol coolant was developed to alleviate the corrosion of cooling plate and the blocking of circulation channels.However, scarce researches focus on it currently. In the present work, corrosion behavior of three Al-alloys, 3A21, 5A05 and 6063, in low-conductive ethylene glycol coolant was comparatively studied by methods of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and immersion test. The results show that 5A05 has the best corrosion resistance in the low-conductive ethylene glycol coolant, which was suffered mainly from uniform corrosion along with mild local corrosion. While Al-alloys 3A21 and 6063 were suffered from pitting corrosion. The Al-alloy 6063 has the poorest pitting-corrosion resistance with the fastest thinning rate and pitting growth rate. The different corrosion behavior of the three Al-alloys in low-conductive ethylene glycol coolant can be attributed to higher Mg content and moderate Mn content of the Al-alloy 5A05.

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    Anti-corrosion Performance of Magnesium Phosphate Coating on Carbon Steel
    Yinghao DONG, Jie ZHOU, Haiyan YANG, Jie YANG, Ke DUAN, Bo FENG, Jie WENG
    Corrosion Science and Protetion Technology. 2017, 29 (5): 515-520.   DOI: 10.11903/1002.6495.2016.283
    Abstract   HTML   PDF (2229KB)

    A magnesium phosphate cement coating (MPC) of ~500 μm in thickness was prepared on 45# carbon steel. The coated steels were characterized by scanning electron microscopy, X-ray diffraction, linear polarization resistance and electrochemical impedance spectroscopy, as well as salt fog test and potentiodynamic polarization. It was found that, the coating consisted of MgKPO46H2O, MgO, and Al2O3 with microcracks on its surface. The coated steels showed a stable polarization resistance and charge transfer resistance during immersion in 3.5%NaCl solution for 12 d. After salt fog test for 1440 h, no evidence of corrosion was observed on the coated steels. Meanwhile, the adhesive strength of MPC is (4.8±0.7) MPa. Polarization test indicated that, the bare steel produced a reduced anodic current and increased Ecorr when immersed in a filter liquor of the suspension of 3.5%NaCl with 10% MPC powders. These results demonstrate that, the MPC coating can provide a stable and satisfactory anti-corrosive effect for 45# steel.

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    Corrosion Behavior of Copper in Cyclic Dry-wet Environment with Gas Mixture of SO2 and H2S
    Xiandi ZUO, Zhiping ZHU, Jie CAO, Deng WANG, Jianfeng XIAO
    Corrosion Science and Protetion Technology. 2017, 29 (5): 521-526.   DOI: 10.11903/1002.6495.2016.260
    Abstract   HTML   PDF (1754KB)

    Accident of power supply system due to corrosion of metallic materials in substation induced by industrial atmospheric emissions has become an important problem, which affects the network security. Among others, the corrosion of copper T2 was the most serious. In this paper, with a home-made setup as indoor accelerated corrosion test means, the corrosion behavior of copper in cyclic dry-wet environment with gas mixture of SO2 and H2S was investigated by means of electrochemical measurement and microscopic characterization. While a BP neural network model was established, of which the forecast dependability was evaluated. The results indicate that the weight increase rapidly at initial stage, but slowly at later stage. The copper T2 suffered from pitting corrosion. The corrosion products with cracks consisted of Cu2Cl(OH)3, Cu2S and Cu4SO4(OH)6. The error of the predicted model is less than 10%, thus the model has good prediction dependability.

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    Corrosion Resistance Property of Electroless Plated Ni-Cu-P Alloy Coatings on NdFeB Magnets Material
    Hanying WANG, Zhaohua WANG, Hongying JIN, Huanming CHEN
    Corrosion Science and Protetion Technology. 2017, 29 (5): 527-532.   DOI: 10.11903/1002.6495.2017.101
    Abstract   HTML   PDF (1759KB)

    Aimed at improving corrosion resistance, four Ni-Cu-P alloy-coatings with different Cu- and P-content were electroless plated on NdFeB magnets material. The open circuit corrosion potential and corrosion current density of Ni-Cu-P coatings were determined by electro-polarization curve, and their corrosion mass loss in HNO3 solution was also examined. Results show that depending on the variation of Cu- and P-content, the coating was crystalline, amorphous or the mixture of the two. The corrosion resistance of Ni-Cu-P coatings varied with their microstructure, among them the amorphous coating possessed the best corrosion resistance, and the crystalline coating was the worst.

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    Formation Mechanism and Properties of Cr-free Double Silane Passivation Film on Hot-dip Galvanizing Steel Sheet
    Taixiong GUO, Changsheng LIU, Quan XU, Lei WANG, Yilin ZHOU
    Corrosion Science and Protetion Technology. 2017, 29 (5): 533-539.   DOI: 10.11903/1002.6495.2016.292
    Abstract   HTML   PDF (2784KB)

    The Cr-free double-silane passivation film prepared on hot-dip galvanizing steel sheet was characterized by means of infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and electrochemical test. While the corrosion resistance, anti-degrease-cleaning and paintability of the passivation film were verified by electrochemical test, neutral salt spray test, hot alkali spraying test and electrostatic powder spraying test. The results show that instead of simple physical adsorption there exist Si-O-Zn bonds between the passivation film and the galvanizing steel. The silane film (the main component of the passivation film) formed on the surface of the hot-dip galvanizing steel sheet presents three-dimensional net structure, the inorganic corrosion inhibitors containing F, Zr and V are filled in the gap within the silane film, thereby the passivation film is very dense. The Cr-free passivation film has strong adhesive strength with the galvanized steel, as well as high alkali-resistance, corrosion-resistance and appropriate paint-ability.

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    Preparation of Super Hydrophobic Surface Film for Rust Bronze by Direct Immersion Method
    Bihan SHI, Ying YAN, Hao ZHOU, Laiming WU, Xuewei WU, Yiliang ZHU, Lankun CAI
    Corrosion Science and Protetion Technology. 2017, 29 (5): 540-546.   DOI: 10.11903/1002.6495.2016.242
    Abstract   HTML   PDF (2449KB)

    In order to protect bronze relics from further corrosion, it is essential to apply a super hydrophobic film on its surface. Super hydrophobic film on the surface of the simulated rust bronze (with mixed rust and powdery rust) was prepared by direct immersion method with n-dodecyl mercaptan(CH3(CH2)10CH2SH) and myristic acid (C14H28O2) mixed solution as hydrophobic agent. The prepared super hydrophobic surface films were characterized by scanning electron microscope, contact angle measuring instrument and Fourier transform infrared spectroscopy. Then the corrosion resistance of the rust bronze with super hydrophobic surface films was assessed by electrochemical workstation. Experimental results show that a ca 0.1 μm compact super hydrophobic film was formed on the surface of the bronze with the above two type rusts, of which the contact angle can reach 157.32° and 151.76° respectively. For the bronze with mixed rust, its free-corrosion current density was reduced from 8.5 mAcm-2 to 2.94×10-1 mAcm-2 due to the applying super hydrophobic surface film, and correspondingly the corrosion inhibition efficiency reached 96.54%. Similarly, for the bronze with powdery rust, the free-corrosion current density was reduced from 5.91 mAcm-2 to 2.89×10-2 mAcm-2, and the corrosion inhibition efficiency reached 99.51%.

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    A New Method to Determine Residual Concentration of Imidazoline Inhibitors in Oilfield Produced Water
    Congyun ZHANG, Yuntian ZHANG, Yang ZHAO, Haibin CUI, Xinshi WANG, Jingmao ZHAO
    Corrosion Science and Protetion Technology. 2017, 29 (5): 547-550.   DOI: 10.11903/1002.6495.2016.282
    Abstract   HTML   PDF (456KB)

    Based on the awareness of limitations concerning the application of ultraviolet spectrophotometric method for the concentration determination of quaternary ammonium salt cationic surfactants, a noveld etermination method was proposed with help of a new-type chromogenic reagent, which is simple, fast and low determinative error for measuring the concentration of imidazoline inhibitor in oilfield produced water.

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    Research Progress of Synergistic Effect on Inhibitors for Copper
    Yanhua ZHANG, Xiuning CHEN, Shuping WANG, Zhiqi HUANG, Jinghua HUANG, Chengxiang HE
    Corrosion Science and Protetion Technology. 2017, 29 (5): 551-560.   DOI: 10.11903/1002.6495.2016.290
    Abstract   HTML   PDF (737KB)

    The synergistic effect of corrosion inhibitors was introduced. The research progress of mixed inhibitors for copper, the synergistic effect and synergistic mechanism of them were summarized in recent years at home and abroad. Further more, the future research directions on synergistic effect of inhibitors for copper were prospected as well.

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    Research Progress Effect of Cathodic Polarization on Microorganism Influenced Corrosion
    Xia LI, Min DU
    Corrosion Science and Protetion Technology. 2017, 29 (5): 561-566.   DOI: 10.11903/1002.6495.2016.263
    Abstract   HTML   PDF (645KB)

    Microorganism influenced corrosion (MIC) in marine environments was always a role. It has been found that cathodic polarization could inhibit the MIC, but the relevant mechanism was not clearly understood yet. Meanwhile, the formation and the existence of biofilm have great influence on the corrosion. Most of the studies implied that cathodic polarization could effectively inhibit the attachment of bacteria,but it didn't achieve a very good effect on the biofilm. The potential of polarization was also a big problem that cannot be ignored. Due to the complexity of environment and the diversity of microorganisms, there was a great difference in the choice of cathodic polarization potential.

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    Corrosion Problems Related with Molten Nitrate Salts for Heat Transfer and Thermal Storage
    Hua SUN, Peng ZHANG, Jianqiang WANG
    Corrosion Science and Protetion Technology. 2017, 29 (5): 567-574.   DOI: 10.11903/1002.6495.2016.258
    Abstract   HTML   PDF (1096KB)

    The type, property and application of molten nitrate salts for heat transfer and thermal storage were reviewed. The corrosion mechanism, the corrosion influence factors and the corrosion issues for the in-service structure materials in molten nitrate salts were summarized. The relevant corrosion protection methods were also proposed. The coming possible research topics and directions about molten nitrate salts and its corrosion problems are also disscussed.

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    Research Progress of Coking Mechanism and Prevention Measures for Ethylene Cracking Furnace Tubes
    Xiaoru SUN, Limin SHEN
    Corrosion Science and Protetion Technology. 2017, 29 (5): 575-580.   DOI: 10.11903/1002.6495.2017.034
    Abstract   HTML   PDF (1230KB)

    The known coking mechanisms of ethylene cracking furnace tubes are introduced such as catalytic coking, free radical coking and gas coking. Then, the development of coking-prevention technology at home and abroad is summarized, such as the improvement of the cracking material and the furnace tube material, the optimization of cracking process and structure of cracking unit, the application of coking-inhibitor and surface coating etc. Finally, suggestions are made on relieving coking and enhancing the service life of furnace tubes. The integrated use of a variety of coking-prevention measures can effectively reduce the amount of coke, such as the combination of coating- and metallurgical-technology, the coating- and optimized cracking material etc.

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    On-line Monitoring Atmospheric Corrosion of Metal Materials by Using a Novel Corrosion Electrochemical Sensor
    Dahai XIA, Shizhe SONG, Jian LI, Weixian JIN
    Corrosion Science and Protetion Technology. 2017, 29 (5): 581-585.   DOI: 10.11903/1002.6495.2016.246
    Abstract   HTML   PDF (4058KB)

    A novel electrochemical sensor is designed for on-line atmospheric corrosion monitoring of metal materials, and the atmospheric corrosion behavior of Q235B and T91 steels are studied by the sensor with electrochemical noise (EN) technique. The atmospheric corrosion process is characterized by using the standard deviation of electrochemical potential noise (EPN) and electrochemical current noise (ECN) together with noise resistance. Experimental results indicate that the designed sensor can be successfully used to monitor atmospheric corrosion of metal materials. For uniform corrosion, there is a direct correlation between the corrosion rate and noise resistance. For localized corrosion, the standard deviation of ECN can reflect corrosion resistance, however, there is no direct relationship between noise resistance and corrosion rate.

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    Field Practice of Down-hole Coupon Corrosion Detect Device for CQQT-III-type for Gas Wells in Sulige Gas Field
    Xiaogang CHEN, Haitao LAI, Xiaojian XU, Zhijuan RU, Lin LI
    Corrosion Science and Protetion Technology. 2017, 29 (5): 586-590.   DOI: 10.11903/1002.6495.2017.050
    Abstract   HTML   PDF (1935KB)

    Measures related with the delivery and salvage were introduced for the down-hole coupon corrosion detect device for CQQT-III type gas wells. Details of the device configuration, corrosion rate calculation and analysis of corrosion products were also introduced. The device was exclusively designed with pullback mass and coupon positioning. The down-hole survey could be taken place in Harsh industrial environment with pullback weight. The coupon positioning allows 30 coupons in one down-hole survey. The device can accurately evaluate the extent of down-hole corrosion for gas well X as an example in Sulige gas field. It is dependable and easy in operation, for the moment which has been successfully carried out more than 40 operations without any defeat. The newly designed device satisfied with the requirements of Harsh down-hole survey terms of Sulige gas field, which has a good applicable prospect in the future.

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