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 and resolution of salt pray test for metal-glass sealing packages PDF (448KB)
Corrosion Behaviors of 3A21, 5A05 and 6063 Aluminum Alloys in Low-conductivity Ethylene Glycol Coolant PDF (808KB)
A New Method to Determie the Residual Concentration of Imidazoline Inhibitors in Oilfield Produced Water PDF (294KB)
Anti-corrosion of Magnesium Phosphate Coating on Carbon Steel PDF (1814KB)
Corrosion Behavior of Q235 Steel in Sour Water PDF (452KB)
Current Issue More>>
      07 April 2017, Volume 29 Issue 2 Previous Issue   
    Orginal Article
    Effects of CO2 on SRB Influenced Corrosion Behavior of X70 Steel in Near-neutral pH Solution
    Xu CHEN,Fengjiao GAO,Wuqi SONG,Xin LI,Chuan HE
    Corrosion Science and Protetion Technology. 2017, 29 (2): 103-109.   DOI: 10.11903/1002.6495.2016.102
    Abstract   HTML   PDF (4032KB)

    The growth curve of sulfate reducing bacterial (SRB) in the near-neutral pH solution (NS4), and the effect of SRB growth cycle on the pH value and the conductivity of the solution were investigated. Then the corrosion behavior of X70 steel in CO2 containing NS4 solutions with SRB was studied by means of electrochemical impedance spectroscopy (EIS) and electro scanning microscope (SEM). The results showed that CO2 played a role as a slowly available carbon source to maintain the growth and metabolism process of SRB, which resulted in a secondary growth phase of SRB. The organic carbon was consumed by SRB metabolism, and thereby the inorganic ions were released at the same time, which resulted in the increase of solution conductivity in the logarithmic phase of SRB growth. CO2 was consumed as the inorganic carbon source in the secondary growth phase,while the inorganic ions were not emerged in the case, so the solution conductivity decreased. The growth cycle had little influence on pH value of the solution, which increased slightly with the increasing CO2 concentration and time. There were circle-shaped cracks on the X70 steel surface in the bacterial solution. With the increasing CO2 concentration in the bacterial solution, the compactness of the oxide scales formed on X70 steel surface gradually became worse, while pitting corrosion on the steel was promoted.

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    Electrochemical Measurements of Corrosion Process of Slag and Cement Mortar-lined Ductile Cast Iron Pipe for Water Supply
    Honggang TANG,Xiaobao ZUO,Yujuan TANG,Linfeng QIU,Yuxiang FENG
    Corrosion Science and Protetion Technology. 2017, 29 (2): 110-116.   DOI: 10.11903/1002.6495.2016.107
    Abstract   HTML   PDF (2959KB)

    Corrosion behavior of ring-shaped segment of ductile cast iron pipe with liner of slag and cement mortar was monitored by means of linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements in disturbed ordinary purified water and 6 mol/L ammonium chloride solution, respectively. The change of polarization resistance, corrosion current density and double-electric-layer capacitance with the corrosion time is acquired, and then the corrosion degree of the test specimen is evaluated. Results show that, the resistance of the slag and cement mortar liner and the charge transfer resistance of the ductile cast iron surface all show a little decrease, while its corrosion current density is far less than the critical value for depassivation for the specimen being immersed in the disturbed purified water for 120 d, so the specimen is almost no corroded. However, the related parameters all show obvious decrease for the specimen being immersed in the disturbed 6 mol/L ammonium chloride solution for the same period, while its corrosion current density is far greater than the critical value for depassivation, thus, the specimen suffers from heavey corrosion. In addition, the corrosion degree of the specimens evaluated by LPR is basically in agreement with that obtained by EIS.

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    Corrosion Behavior of 316L and HR-2 Stainless Steels in Ferric Chloride Solution
    Liuqing YANG,Daoxin LIU,Chaoyang XIE,Zhengliang WANG,Xingchen XU,Zuoyan YE
    Corrosion Science and Protetion Technology. 2017, 29 (2): 117-124.   DOI: 10.11903/1002.6495.2016.105
    Abstract   HTML   PDF (5015KB)

    The corrosion behavior of stainless steels 316L and HR-2 in ferric chloride solution was investigated by immersion method, electrochemical test, scanning electrochemical microscopy (SECM) , slow strain rate tensile test (SSRT) and stress corrosion cracking (SCC) test. The results demonstrate that the corrosion resistance of both HR-2 SS and 316L SS without stress is better, only 316L SS is slight sensitive to pitting. However, under dynamic tensile stress, the SCC susceptibility of the two steels is high. This is because dynamic tensile stress promotes the rupture of surface passive film, and accelerates the initiation and propagation of SCC crack. 316L SS exhibited more sensitive to SCC than HR-2 SS, which is due to the pitting susceptibility of 316L is higher, thereby, the passive film on 316L can be destroyed easily under dynamic tensile loading.

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    Preparation of Graphene Coatings on Carbon Steel by Electrophoretic Deposition and Their Corrosion Performance in NaCl Solution
    Taoming JIANG,Feng HUANG,Qian HU,Jing LIU,Wenwei QIAO
    Corrosion Science and Protetion Technology. 2017, 29 (2): 125-131.   DOI: 10.11903/1002.6495.2016.223
    Abstract   HTML   PDF (2508KB)

    Coatings of C750 graphene were deposited on carbon steel by electrophoretic deposition technology. They were characterized by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and Raman spectroscopy (Raman). The corrosion performance of Q235 carbon steel with C750 graphene coating in 3.5%NaCl solution was assessed by electrochemical methods. The result showed thatC750 graphene coating could be applied on Q235 carbon steel substrate by electrophoretic deposition. With the increasing of the concentration of H+-C750 in the electrolyte, the corrosion resistance of C750 graphene coating increased first and then decreased. The well corrosion resistance of the C750 graphene coatings may be ascribed to that the presence of graphene changed the cathodic polarization behavior of the electrode.

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    Experimental on Optimal Selection of Anticorrosion Coating for Urban Gas Riser
    Sixi ZHA,Kang CEN,Junying TANG,Gang XU,Min LUO
    Corrosion Science and Protetion Technology. 2017, 29 (2): 132-138.   DOI: 10.11903/1002.6495.2016.148
    Abstract   HTML   PDF (3785KB)

    Due to the inappropriate application of anticorrosive coating, severe external corrosion of urban gas riser always occurred. Four kinds of anticorrosion coatings, i.e. conventional antirust paint, fusion bonded epoxy coating, polyethylene coating and 3-layer polyethylene coating with tinfoil, were applied on pipe samples, and then their corrosion performance was comparatively evaluated by mean of artificial accelerated aging tests, electrochemical impedance measurement, pulse electric spark leak detector and scanning electron microscope (SEM). Besides, their quality, convenience in construction & repairing, cost of manufacture and maintenance were also assessed. The results show that fusion bonded epoxy coating has the best price/performance ratio, while the conventional antirust paint is the worst. It is a recommendation that the anticorrosion coating for urban gas riser should adopt fusion bonded epoxy coating to replace the conventional antirust paint.

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    Corrosion Resistance of Organic Composite Coatings on 2A12 Aluminum Alloy
    Peixiang ZHENG,Yi LI,Konglin ZHANG,Deyuan LIN,Yunxiang CHEN,Yong ZHENG
    Corrosion Science and Protetion Technology. 2017, 29 (2): 139-144.   DOI: 10.11903/1002.6495.2016.279
    Abstract   HTML   PDF (2954KB)

    Organic composite coatings were prepared on the surface of 2A12 aluminum alloy with fluorocarbon paint, acrylic polyurethane paint, epoxy glass flake paint, acrylic polyurethane paint, anti-corrosion primer and aluminum alloy-specific paint as ingredients according to different combinations of paints. The corrosion behavior of the prepared organic composite coatings was assessed by means of neutral salt spray accelerated corrosion test, polarization curve measurement, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results showed that the adhesion between the organic composite coatings and the Al-alloy substrate was excellent as well as the adhesion between each layer of organic composite coating. After 30 d neutral salt spray corrosion, every organic composite coating still kept the surface gloss fairly well, and there was no cracking and spalling to be detected on the coating surface. The organic composite coating consisted of fluorocarbon paint, epoxy glass flake paint and anti-corrosion primer had the best corrosion resistance, and the corrosion current density decreased by 3 orders of magnitude, the polarization resistance increased by 3 orders of magnitude and the impedance value roughly enhanced by 2 orders of magnitude, compared with 2A12 aluminum alloy.

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    Preparation and Performance of Silane Coating on 2024 Aluminum Alloy
    Shilei ZHOU,Yu DONG,Wenjuan CAI,Shaoyi LIU,Yonglian QIAO,Qingpeng LI,Jianguo LIU,Chuanwei YAN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 145-150.   DOI: 10.11903/1002.6495.2016.111
    Abstract   HTML   PDF (2359KB)

    A novel Cr-free silane film on 2024 aluminum alloy was prepared with the hydrolysate of silane A-187 as precursors. The corrosion resistance, as well as the composition and morphology of the coatings were characterized by means of potentiodynamic measurement, NSS test and AC impedance spectra, as well as by EDS, XPS and SEM respectively. The results showed that the Cr-free silane coating had excellent corrosion resistance and there were no obvious corrosion observed after 168 h salt spray test. The silane coating enables the corrosion potential (Ecorr) increased of the alloy to be shifted positively ca 154 mV, while the resistance of the coating increased gradually with the immersion time. It follows that the silane coating can provide effectively good protection for 2024 aluminum alloy.

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    Anticorrosion Performance of Environmental Friendly Self-healing Coatings
    Chengbao LIU,Zuwei SONG,Junfeng REN,Bei QIAN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 151-157.   DOI: 10.11903/1002.6495.2016.104
    Abstract   HTML   PDF (1742KB)

    Nanocontainers were prepared through layer by layer (LbL) self-assembly technology with nano-sized SiO2 as a core and natural polyelectrolyte chitosan, sodium alginate and polyaspartic acid inhibitor as shell materials, which were further characterized by menas of Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). Then bionic self-healing epoxy coatings were prepared by blending the nanocontainers with epoxy resin. The corrosion performance of coating/Q235 steel in 3.5%NaCl solution was investigated by electrochemical impendence spectroscopy (EIS). Results show that the corrosion resistance of self-healing epoxy coatings is better than that of blank coatings, which have the ability of self-healing after damaging.

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    X-ray Photoelectron Spectroscopy Characterization of Oxide Scale Formed on an Angle Steel SS400 after Long Term Service by High-voltage Transmission Tower
    Yidong ZHU,Dawei HU,Yisong ZHAO,Weigang ZHENG,Shenggang WANG,Kang LONG
    Corrosion Science and Protetion Technology. 2017, 29 (2): 158-162.   DOI: 10.11903/1002.6495.2016.116
    Abstract   HTML   PDF (628KB)

    SS400 angle steel has served for more than 80 a in the high-voltage transmission tower in Liaoning power network. It did not suffer from evident uniform- and localized-corrosion, which indicates its good anti-corrosion resistance. In this work, the electronic structures and valence bands of main elements of the oxide scale formed on SS400 angle steel were characterized by X-ray photoelectron spectroscopy (XPS). The results demonstrate that the binding energies of Zn2+2p3/2 and Fe3+2p3/2 were (1022.10±0.08) and (710.72±0.09) eV respectively as a constant binding energy during the Ar+ sputtering, the atomic percentages of Fe, Cr and Mn were less than 10%. The main components of the oxide scale on SS400 angle steel were Zn oxide and C-O chemical compounds. The reasons for good anti-corrosion resistance of the SS400 angle steel were analyzed with the XPS results of its oxide scale and its chemical composition.

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    Performance of Ni-P Alloy Coatings Prepared by Ultrasonic Assisted Electroless Plating on 316L Stainless Steel
    Jianzhang GUO,Jia ZHAO
    Corrosion Science and Protetion Technology. 2017, 29 (2): 163-167.   DOI: 10.11903/1002.6495.2016.109
    Abstract   HTML   PDF (1873KB)

    Coatings of Ni-P alloy were deposited on 316L stainless steel by electroless plating assited without and with ultrasonic respectively, then their performance was characterized by means of SEM and EDS in terms of surface morphology and composition of the coatings. The hardness of two coatings before and after heat treatment was examined, while their electrochemical behavior was also tested in 2%HCl solution. The results indicated that the coatings obtained by the ultrasonic assisted electroless plating gained a higher hardness, better surface quality and corrosion resistance than those by the ordinary electroless plating.

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    Failure Analysis of a 12Cr13 Steel Impeller in Hot Alkali Pump
    Yanhua SHI,Qingsong YE,Zuobao HE,Ping LIANG,Ling WANG
    Corrosion Science and Protetion Technology. 2017, 29 (2): 168-172.   DOI: 10.11903/1002.6495.2016.134
    Abstract   HTML   PDF (1627KB)

    Serious deformation induced failure occurred for a hot alkali pump made of 12Cr13 steel after a short term service. Then the damaged pump parts were analyzed by means of SEM, EDS and XRD etc. in terms of corrosion morphology, phase component and composition of corrosion products. The results revealed that serious erosion-corrosion occurred on impeller surface, and the corrosion product scale with small amount of microcracks was porous and loose,which composed of Cr2O3 as well as other compounds of Fe, Mg and Zn, the later ones destroyed the continuity and the compactness of the Cr2O3 passivation film, and thereby led to losing protectiveness. It is also found that high speed erosion promoted the spalltion of corrosion products and the probability of localized corrosion of the steel. As a result, the impeller gradually became thinner and finally led to deformation failure. The factors affected the corrosion rate of 12Cr13 steel may be ranked in a descending order as follows: flow rate, temperature, time and concentration, successively.

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    Corrosion Inhibition of Ionic Liquid Ethyl Sulfate-1-methyl-3-ethyl on Corrosion of Q235 Steel in Ca(OH)2 Saturated 3.5%NaCl Solution
    Xin ZHOU,Ren CHEN,Guoxi WU,Fuhui WANG
    Corrosion Science and Protetion Technology. 2017, 29 (2): 173-177.   DOI: 10.11903/1002.6495.2016.250
    Abstract   HTML   PDF (2836KB)

    The corrosion inhibition effect of ionic liquid of ethyl sulfate-1-methyl-3-ethyl imidazole on the corrosion of Q235 steel in Ca(OH)2 saturated 3.5%(mass fraction) NaCl solution was assessed by means of electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), atomic force microscope (AFM) and X-ray photoelectron spectrometer (XPS). Results show that the imidazole ionic liquid of ethyl sulfate-1-methyl-3-ethyl acts as a very effective inhibitor, which can significantly promote the passivation of the steel and suppress the attack of chloride ion on the surface of steel. The surface analysis of the test steel also proves the above findings.

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    Wet-dry Cyclic Corrosion Behavior of Epoxy Coating/Carbon Steel System with Local Coating Damages
    Wenliang ZHANG,Xuan ZHANG,Baigang AN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 178-182.   DOI: 10.11903/1002.6495.2016.206
    Abstract   HTML   PDF (1658KB)

    The coating/metal system served in atmosphere inevitably suffers from local degradation of coating and thus results in exposure of the metal substrate locally. When there is an electrolyte film formed on such a coating/metal system, it makes metal substrate partly covered by the open electrolyte film, but the nearby metal substrate beneath the coating is covered by an occlusive electrolyte film. Therefore, an electrochemical cell to simulate such system was designed and built up. By using this cell, the corrosion behavior of epoxy coating/carbon steel system by wet-dry cyclic test beneath a thin electrolyte film of 3%NaCl solution was investigated by means of electrochemical impedance spectroscopy, scanning electronic microscopy and Fourier transformation infrared spectroscopy. The results show that the corrosion rate of the exposed steel reaches the largest value by the 4th wet-dry cycle and then gradually decreases, however, the corrosion rate of coated steel reaches maximum by the 6th cycle and then decreases slowly to a steady-state with cycles. Because the electrolyte film on the exposed steel is an open form, but that is an occlusive for the metal beneath the coating, thus a corrosion cell of oxygen difference was formed, in which the exposed steel plays as the anode and thus its corrosion rate is always higher than that beneath coating. Owning to the diffusion and migration of ions occurred between the two type electrolyte films, the corrosion products on the exposed steel present multi-layered ladder-like morphology from the centre to its periphery. However, the corrosion product formed on the steel beneath the coating exhibits ripple morphology.

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    Corrosion Performance on Several Grounding Net Materials in Soils of Qinghai-Tibet Plateau
    Zhongzhou CAI,Yongxiang CAI,Shiyin TAO,Min WANG,Chaojun ZHAO,Zhu ZHAO
    Corrosion Science and Protetion Technology. 2017, 29 (2): 183-187.   DOI: 10.11903/1002.6495.2016.118
    Abstract   HTML   PDF (4634KB)

    Several grounding net materials such as copper, round steel, rebar and galvanized flat iron were buried in soils of 5 selecteed test sites at the Tibetan plateau for 1 a and then their corrosion performance was characterized by means of mass loss method, scanning electron microscope and X-ray diffractometer. The results indicated that regarding to corrosion resistance, the copper was the best with a corrosion rate around 0.006 mm/a, which about a quarter of rebar, and the rebar was the one with the worst corrosion resistance. The corrosion products of round steel and rebar composed mainly of Fe2O3 and Fe2O3nH2O. Corrosion products of galvanized flat iron composed of Zn5(CO3)2(OH)6, Fe2O3 and ZnO and corrosion products of copper composed mainly of CuCO3Cu(OH)2, CuO and Cu2O.

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    Comprehensive Approach of Inspection and Assessment of External Corrosion of Aged Pipelines in Oil/Gas Field
    Wenjin TAO,Zhiwei YANG,Xiuquan WU,Changying HU,Maocheng YAN,Changkun YU,Jin XU,Cheng SUN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 188-194.   DOI: 10.11903/1002.6495.2016.117
    Abstract   HTML   PDF (2316KB)

    A comprehensive evaluation of the external corrosion situation for the aged Sanhua crude oil pipeline in Xinjiang oilfield was carried out by combined techniques of alternating current attenuation method (PCM), DC potential gradient (DCVG) and close interval potential survey (CIPS). The evaluation includes such as soil corrosion survey, coating integrity survey, effectiveness of cathodic protection (CP), DC/AC stray current interference and site excavation. Results revealed that coatings are aged with total 592 of serious damaged spots along the piprline; the potential of 39.2 km pipeline does not meet CP potential standard. Based on the comprehensive evaluation results, measures related with coating restoration and CP adjustment were proposed.

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    Corrosion Failure Analysis on a Wastewater Pipeline for a Gas Gathering Station
    Xiu JIANG,Yan LIU,Juzhong FAN,Xiaoliang SONG,Qiaoping LIU,Jing QI,Guangbin SHAN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 195-198.   DOI: 10.11903/1002.6495.2016.144
    Abstract   HTML   PDF (4487KB)

    Corrosion failure of a waste water pipeline for a gas gathering station was analyzed by means of corrosion morphology observation, corrosion product analysis by using SEM, XRD and EDS, as well as analysis of wastewater. Experiments were also carried out to simulate the working condition in order to understand the corrosion behavior of waste water pipeline. The results showed that a lot of sulfate reducing bacteria (SRB) and a small amount of saprophytic bacteria (TGB) and iron bacteria were detected in the wastewater, by which the formation scaling on the pipeline might be facilitated. The corrosion failure of the wastewater pipeline was due to the microbiological influenced corrosion (MIC) and underdeposit corrosion. The Cl- in the wastewater accelerated the corrosion process.

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    Research Progress of Coatings Used on Marine Propeller
    Xuzhong SHI
    Corrosion Science and Protetion Technology. 2017, 29 (2): 199-203.   DOI: 10.11903/1002.6495.2016.238
    Abstract   HTML   PDF (955KB)

    Marine propellers face severe service conditions, such as cavitation erosion and marine biofouling etc. This paper reviews the research progress of coatings used on marine propellers. The research and application cases of metal coating, ceramic coating, organic coating and composite coating on propellers in the world are introduced respectively. The summary and analysis are put forward at the end of the paper.

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    Research Progress in Zn-rich Silicate Inorganic Anti-corrosion Coatings
    Shuhua ZHAO,Yu CHEN,Shuli WANG,Yongchao RAO,Feifei LIU,Hong CHEN,Xiaojun SHI,Jiahua DAI
    Corrosion Science and Protetion Technology. 2017, 29 (2): 204-208.   DOI: 10.11903/1002.6495.2016.149
    Abstract   HTML   PDF (538KB)

    Based on the research at home and abroad in recent years, reviewed progress of silicate inorganic zinc-rich coating from anti-corrosion mechanism, membrane material, zinc powder and nano additives four aspects respectively and summed up its construction characteristics combined with the construction site situation. Finally, the existing problems and future developing trends of the coating were also put forward.

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    Analysis on Pipeline Corrosion Perforation of Auxiliary Cooling Water System at Fuqing Nuclear Power Plant
    Ze QIAO,Xingbao ZHAO,Ping CHEN,Jiankang LIN
    Corrosion Science and Protetion Technology. 2017, 29 (2): 209-212.   DOI: 10.11903/1002.6495.2016.231
    Abstract   HTML   PDF (1985KB)

    There are many seawater pipelines in a nuclear power plant. As seawater with high corrosive property, in spite of anti-corrosion measures such as coating, rubber lining and sacrificial anode have already applied to pipelines since the design, but corrosion occurs endlessly, especially perforation of the pipelines. An analysis on the case history of the corrosion induced perforation of pipeline of the auxiliary cooling water system at Fuqing nuclear power plant has been made, and it follows that the corrosion case may be ascribed to the poor construction quality, the insufficient protection supplied by sacrificial anode and the galvanic corrosion induced by the coupling of the perforated pipe with the conjoint heat exchanger. The findings and conclusions may be a useful reference for the selection of corrosion protection countermeasures as well as the further design and construction of the seawater pipeline.

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