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

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Corrosion Behavior of Nickel-based Alloy 718 at the Simulated H2S/CO2 Environments
As the exploration and development of oil and gas fields continue to deepen, the acidic oil and gas fields are rich in CO2, H2S, Cl- and other corrosive media, which makes the production environment increasingly severe, and puts higher requirements on the performance of the service components.Nickel. . .
Corrosion Science and Protetion Technology, 0 Vol. (): 0-0    DOI: 10.11903/1002.6495.2018.219
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The Detection and Law Analysis of Beijing Subway Stray Current Interference on buried Gas Pipelines PDF (609KB)
Study on Corrosion Resistance Modification of Phosphate Conversion Coating on AZ91D Magnesium Alloy by Ammonium Metavanadate PDF (647KB)
Progress in graphene anticorrosive coating PDF (399KB)
Current Issue More>>
      20 November 2018, Volume 30 Issue 6 Previous Issue   
    Orginal Article
    Corrosion Properties of HVOF Sprayed Coatings of WC-12Co and WC-10Co4Cr on TC18 Ti-alloy
    Feng DING, Pingze ZHANG, Dongbo WEI, Xiaohu CHEN, Cheng WANG
    Corrosion Science and Protetion Technology. 2018, 30 (6): 563-569.   DOI: 10.11903/1002.6495.2018.187
    Abstract   HTML   PDF (2872KB)

    Coatings of WC-12Co and WC-10Co4Cr were fabricated on TC18 Ti-alloy via high velocity oxygen fuel process. Their microstructure and phase composition were characterized by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The surface microhardness and plasticity-toughness of the coated alloys were measured with microhardness tester and dynamic ultra microhardness tester respectively. While the corrosion behavior of TC18 alloy without and with coatings of WC-12Co and WC-10Co4Cr respectively was comparatively assessed by means of electrochemical test and salt spray test. The results showed that the microhardness and elastic modulus of WC-12Co coating (HV0.31177.2, 355 GPa) and WC-10Co4Cr coating (HV0.31258.8, 391 GPa) were significantly higher than that of TC18 substrate (HV0.3336.4, 102 GPa). Both WC-12Co coating and WC-10Co4Cr coating were able to effectively improve the corrosion resistance of TC18 substrate, and the WC-10Co4Cr coating exhibited better corrosion resistance.

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    Chemical Conversion Coating on Extruded Profile of Al-alloy Prepared with Tungstate- and Titanate-containing Bath
    Yongjun ZHANG, Chunyang LI, Jian'an LI, Zongchuang WU, Zhiyong XIAN
    Corrosion Science and Protetion Technology. 2018, 30 (6): 570-576.   DOI: 10.11903/1002.6495.2018.007
    Abstract   HTML   PDF (1880KB)

    Taking the surface density of chemical conversion coating and its corrosion protectiveness as the main evaluation indexes, the optimal process parameters of chemical conversion treatment with tungstate- and titanate-containing bath for 6063 Al-alloy extrusion were determined by single factor experiment: i.e. H3PO4 10.0 mL/L, NaF 3.5 g/L, K2TiF6 1.1 g/L, Na2WO4 1.0 g/L, 5-Sulfosalicylic acid 1.5 g/L, pH=2.40, solution temperature 40 ℃ and treatment time 10 min. The prepared conversion coating is intact, uniform and grayish white, of which the life-time before corrosion occurence by dropping test with copper sulfate solution is up to 62 s. The surface morphology and composition, as well as, corrosion performance of the coating were examined by SEM with EDS and dynamic polarization measurement. Results indicate that W- and Ti-containing conversion films are complex compounds composed of P, Ti, W, F,O and Al. The Ecorr of the conversion treated alloy is -0.688 V, which is 303 mV higher than that of the bare Al-alloy substrate, suggesting that the chemical conversion coating is cathodic. The Icorr of the conversion treated alloy is 4.02×10-3 μA/cm2, which is three orders of magnitude lower than that of the contest alloy, manifesting the significant improvement of the corrosion resistance.

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    Application of Magnesium Sacrificial Anode for Mitigation of Metro Stray Current on Buried Metallic Pipeline:Field Test and Design
    Dezhi TANG, Hongjian CHEN, Yanxia DU, Yong FU, Tan GU, Minxu LU
    Corrosion Science and Protetion Technology. 2018, 30 (6): 577-584.   DOI: 10.11903/1002.6495.2017.307
    Abstract   HTML   PDF (1492KB)

    The dramaticaly developing metro system in urbans interferes with buried metallic pipelines nearby in terms of stray current. In this work, application of magnesium sacrificial anode for mitigating the interference of metro stray current to the buried metallic pipeline was investigated by field test and theoretical analysis. The results showed that the interference of metro stray current to the buried pipeline could be controlled effectively by applying magnesium sacrificial anode when the noble potential of pipeline-to-earth is below +1.5 VCSE, however, of which the effective protection range was within a range of two hundred meters. Besides, it decreased with the increasing stray current. Based on the above results and the theoretical consideration, a model was proposed for predicting the effective protection range of magnesium sacrificial anode drainage for the pipeline subjected to tray current interference.

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    Corrosion Behavior of Galvanized Steel for Power Transmission Tower in Solutions with Different Concentrations of NaCl and NaHSO3
    Renkun ZHANG, Honghong CHENG, Yuebin WU, Kaihe ZHOU, Yunhui FANG, Shuan LIU, Jibin PU, Liping WANG
    Corrosion Science and Protetion Technology. 2018, 30 (6): 585-593.   DOI: 10.11903/1002.6495.2017.305
    Abstract   HTML   PDF (2339KB)

    Electrochemical corrosion behavior of galvanized steel in liquid media with different concentration of Cl- and HSO3- was investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization, as well as scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). Results showed that in solutions with NaCl or NaHSO3, the corrosion rate of galvanized steel was accelerated and the corrosion potential of the galvanized steel electrode shifted negatively, while the corrosion current density increased with the increasing concentration of Cl- or HSO3-. In addition, the effect of the combination of Cl- and HSO3- on the corrosion of galvanized steel was more serious than that of the single Cl- or HSO3-.

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    Corrosion Inhibition of a Novel Surfactant TL-16 to Carbon Steel in HCl Medium
    Tinglan ZHANG, Zhongwen PAN, Zhenwei ZHANG, Yangyang LI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 594-600.   DOI: 10.11903/1002.6495.2018.090
    Abstract   HTML   PDF (2258KB)

    TL-16, a novel cyclohexene diester cationic gemini surfactant,is synthesized via a complex process of esterification, transesterification and quaternization, with tetrahydrophthalic anhydride, N,N-dimethylethanolamine and n-bromohexadecane as the starting materials.The corrosion inhibition effect of TL-16 and hexadecyl trimethyl ammonium bromide (CTAB) on Q235 carbon steel in 1 mol/L HCl medium was investigated by means of electrochemical and mass loss methods respectively. Results show that the corrosion inhibition efficiency of surfactant TL-16 on carbon steel increases with the increasing concentration. When the surfactant concentration was 1.0×10-5 mol/L, the corrosion inhibition efficiency of TL-16 and CTAB was 92.48% and 57.78% respectively. Both TL-16 and CTAB are mixed-type corrosion inhibitors to cathode inhibition. Their adsorption on the carbon steel surface conforms to the Langmuir adsorption isotherm.

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    Synergistic Corrosion Inhibition Effect of Hexamethy-lenetetramine and Carboxymethylcellulose Sodium
    Jiaxin WEN, Yunxia LIU, Kejian LIU, Ying LI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 601-606.   DOI: 10.11903/1002.6495.2018.001
    Abstract   HTML   PDF (2620KB)

    The synergistic corrosion inhibition effect of hexamethylenetetramine (HMTA) and carboxymethylcellulose sodium (CMC) on Q235 steel in 0.5 mol/L H2SO4 solution was studied by means of weight loss and polarization curve measurements and electrical impedance spectroscopy (EIS), while the mechanism of the synergistic corrosion inhibition effect was also discussed. Results showed that the HMTA has a certain inhibition effect for Q235 steel in 0.5 mol/L H2SO4 solution. However, the inhibition efficiency increased significantly when HMTA was compounded with CMC, which can be up to 91.63%. The compound inhibitor was a mix-type inhibitor presenting great restraint action on cathodic hydrogen evolution and retarding the corrosion through spontaneous adsorption on the surface of Q235 steel. In addition, the adsorption of CMC on the Q235 steel surface followed the Langmuir adsorption model, and the adsorption equilibrium constant was 84.027 L/g.

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    Corrosion Behavior of Weld Joints of Dissimilar Steels T91 and 12Cr1MoVG
    Wei XU, Xiaoguang WANG, Weirui ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (6): 607-612.   DOI: 10.11903/1002.6495.2018.140
    Abstract   HTML   PDF (3797KB)

    Pipe steels of T91 and 12Cr1MoVG were jointed by TIG welding. The corrosion behavior of T91 steel, 12Cr1MoVG steel and weld joint T91/12Cr1MoVG in 3.5% (mass fraction) NaCl solution was studied by means of EIS, polarization curve measurement and soaking corrosion tests. The heat affected zone of 12Cr1MoVG steel presents a microstructure of coarse ferrite and pearlite and which suffered from the most severe corrosion degree after soaking in 3.5%NaCl solution. Electrochemical results showed that in the 3.5%NaCl solution, the alloy steels present typical anode active dissolution without any sign of passivation, while T91 steel had the highest corrosion potential and the best corrosion resistance. The corrosion potential of the welded joint is in between those of T91 steel and 12Cr1MoVG steel. The radius of the capacitive arc of T91 steel is the highest, the radius of the capacitive arc of the welded joint is the smallest. It follows that the main factors affecting the corrosion resistance of weld joint may include the coarsening and the composition variation of the heat affected zone.

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    Corrosion Inhibition of a Bis-schiff Base for N80 Steel in HCl Acid Solution
    Hong LIU
    Corrosion Science and Protetion Technology. 2018, 30 (6): 613-619.   DOI: 10.11903/1002.6495.2018.002
    Abstract   HTML   PDF (2111KB)

    The corrosion inhibition of a Bis-schiff base (PCBD) for N80 steel in 1 mol/L HCl solution was investigated by means of mass loss methods, electrochemical measurements and scanning electron microscopy. Results show that PCBD presents excellent inhibition effect for N80 steel in solution of 1 mol/L HCl, of which the inhibition efficiency increases with the increase of PCBD concentration, while decreases with the increase of temperature. The inhibition efficiency reaches 96% in solution with the inhibitor concentration of 1.0 mmol/L PCBD at 298 K. The adsorption of PCBD on the metal surface follows the Langmuir isotherm. It is found that PCBD acts as mixed-type inhibitor, which can be adsorbed on N80 steel surface, leading to the formation of a protective film to decrease the corrosion rate. The addition of PCBD in HCl solution can enhance the apparent activation energy of the corrosion reaction on carbon steel, resulting in the significant corrosion inhibition effect. Accordingly, the relevant thermodynamic and kinetic parameters were calculated and discussed.

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    Microstructure and Corrosion Behavior of 10Cr13Ni2 Mar-tensitic Stainless Steel Welded Joints in 5%NaCl Solution
    Junhua ZHANG, Ruifeng NIU, Honggang ZHAO
    Corrosion Science and Protetion Technology. 2018, 30 (6): 620-624.   DOI: 10.11903/1002.6495.2018.012
    Abstract   HTML   PDF (6090KB)

    Plates of a new-type 10Cr13Ni2 martensitic stainless steel were welded via multilayer- and multipass-butt welding with G232 welding rod by three different pre- and post-treatment processes. The microstructure and corrosion behavior in 5% (mass fraction) NaCl solution of the welded joints were examined by means of optical microscope as well as measurements of polarization curve and electrochemical impendence spectrum. Resluts show when the pre-heating temperature rises from 150 ℃ to 250 ℃, the original dispersed ferrite-phase with irregular block-like shape in the area nearby the superheated zone transformed into ones with regular block-like shape and distributed along the fusion line,while the coarse columnar grains in the weld zone decreased and the size of martensite leth grew obviously. The martensite microstructure transformed into tempered bainite microstructure after post welding heat treatment. Correspnodingly, the pitting corrosion resistance of the heat affected zone was greatly improved, hewever the tempering carbide in the weld zone results in the decreasing pitting corrosion resistance after tempering at 610 ℃.

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    Critical Pitting Temperature of High Nitrogen Austenitic Stainless Steel and Effect of Cl- Concentration on It
    Yier GUO, Ping LIANG, Jiapeng CHI, Xuguang PANG, Yanhua SHI, Hua QIN, Fei LI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 625-629.   DOI: 10.11903/1002.6495.2018.021
    Abstract   HTML   PDF (1171KB)

    In order to determine the critical pitting temperature (CPT) of high nitrogen austenitic stainless steels (HNS) in 3.5% (mass fraction) NaCl solution, the CPT range of HNS in NaCl solution was measured by electrochemical impedance spectroscopy and potentiodynamic polarization curves, and the specific temperature of CPT was determined by potentiostatic polarization method, and the effect of Cl- concentration on CPT was also investigated, and the accuracy of CPT was further verified by optical microscope. The results showed that there was a large decrease of the capacitive arc diameter and the charge transfer resistance Rct at the range of 70~75 ℃. The break potential from the potentiodynamic polarization curve also displayed a significant decrease at 70~75 ℃. The CPT determined from potentiostatic polarization curve was 71.2 ℃, and at the same time, it was found that the CPT decreased from 71.2 ℃ to 66.5 ℃ as the NaCl concentration increased from 3.5% to 20%.

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    Semiconductor Properties of Passive Film Formed on γΝ-phase Layer in 3.5%NaCl Solution
    Guangyu LI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 630-634.   DOI: 10.11903/1002.6495.2018.032
    Abstract   HTML   PDF (686KB)

    A high-nitrogen face-centered-cubic phase (γΝ) layer was prepared on the AISI 304L austenitic stainless steel surface via plasma source nitriding process. The anodic polarization curves and Mott-Schottky plots of the γN-phase layer in 3.5% (mass fraction) NaCl aqueous solution was assessed by electrochemical measurements. The donor and acceptor density, the flat band potential, the diffusivity of point defect in the passive film on the γN phase layer were calculated by point defect model (PDM). The results show that the anodic polarization curves of the γΝ-phase layer underwent a typical spontaneous passivation-transpassive dissolution process, the free-corrosion potential of the γΝ-phase layer increases by 323 mV (SCE), the passivation current density deduces one order of magnitude, in comparison with the original stainless steel. The passive film on the γΝ-phase layer exhibits p-type semi-conductive characters in the potential region lower than the flat band potential, and n-type semi-conductive characters in the potential region higher than the flat band potential. The passive film on γΝ-phase layer has much lower donor- and acceptor-density and more negative of the flat band potential. On the base of a point defect mode, the diffusivity of point defect, which is caused by oxygen vacancy, in original stainless steel and γΝ-phase layer were calculated to be of 1.22×10-16 and 7.96×10-17 cm2/s, respectively. So in contrast to the original stainless steel, the passive film of γΝ phase layer presents higher insulativity.

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    A Survey of Effect of Stray Current of Light-rail on Buried Gas Pipelines
    Hao WU, Kuichang WANG, Wensheng ZHANG, Zhuokuan ZHAO, Man AO, Cheng SUN, Jin XU, Changkun YU
    Corrosion Science and Protetion Technology. 2018, 30 (6): 635-640.   DOI: 10.11903/1002.6495.2018.005
    Abstract   HTML   PDF (1147KB)

    A survey of the effect of stray current of light rail on two buried gas pipelines in Hunnan distric of Shenyang is carried out at four selected test sites. Results show that there exists serious effect of stray currents on the buried pipeline nearby. The maximum positive shifts of the pipe-to-ground potential reach 188, 233, 180 and 187 mV, respectively for the four test sites. The positive shifting of the potential of pipe results in the increase of the anodic dissolution of the buried pipeline steel where the coating is broken, which for long may lead to perforation and leakage of the pipeline. The polarity drainage and negative potential drainage are used to protect the pipeline from the interference of DC stray current. After the application of the drainage measures, the effect of DC stray current on the buried pipeline may effectively be eliminated.

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    Failure Analysis of Enamel Coating on Air Pre-heater in a Power Plant
    Chong CUI, Yiwen ZHANG, Risu NA, Yongjun DONG, Deming XIAO
    Corrosion Science and Protetion Technology. 2018, 30 (6): 641-645.   DOI: 10.11903/1002.6495.2018.023
    Abstract   HTML   PDF (2869KB)

    Enamel coatings are widely used on the cold end of air pre-heaters to prevent particles erosion and sulfuric acid dew point corrosion. During an overhaul of a 300 MW power plant, it was found that there existed heavy damages and spallation of enamel coating on the cold end plates. Therefore, the chemical composition, thickness, microstructure, resistance to hot sulfuric acid and corrosion products of the enamel coating were examined. Results show that the coating thickness is about 150 μm, its main components are Al, Si, Na, K, Ca, Li and O, and the corrosion depth is about 22 μm. Clusters of bubbles with diameters of 10~120 μm inside the coating could be observed, the diameter of 20% bubbles is above 80 μm. Large bubbles can significantly reduce the effective thickness of the coating and decrease the service life. The sharp corners in the wall of the bubbles can result in stress concentration and become the origin of cracks during operation. The micro-cracks gradually expand under the alternate fields of temperature and stress. When it expands transversely, the coating may be suffered from spallation. While it expands longitudinally to penetrate the coatings, so that the substrate will easy be suffered from sulfuric acid dew point corrosion.

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    Recent Progress in Ceramic Conversion Treatment for Metals
    Zhiping SUN, Yi JI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 646-652.   DOI: 10.11903/1002.6495.2017.285
    Abstract   HTML   PDF (674KB)

    This review focused on recent achievements on the development of ceramic conversion agents and the formation mechanism of ceramic conversion coatings for metallic materials. The fundamentals of ceramic conversion treatment are also briefly described and some of the future research challenges are discussed.

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    Research Progress in Corrosion of Buried Pipeline under Dynamic DC Stray Current Interference from Urban Rail Transit
    Huimin QIN, Yanxia DU, Minxu LU, Wuxi BI, Anqing FU
    Corrosion Science and Protetion Technology. 2018, 30 (6): 653-660.   DOI: 10.11903/1002.6495.2018.013
    Abstract   HTML   PDF (700KB)

    With the rapid development of energy- and transport-industry, it happens often in the practice that the urban rail transit and the buried pipeline system may intersect or parallel with each other. Therefore, the dynamic DC stray current of the urban rail transit interferes with the buried pipeline more and more seriously. The paper introduced the following aspects related with the effect of dynamic DC stray current on the pipeline: namely the regularity and mechanism of pipeline corrosion induced by the stray current, the judgment standard for evaluating corrosion risk, and the research status and research progress on dynamic DC interference of urban rail transit on the buried pipeline. At last, the research trend on the effect of the dynamic DC stray current interference was discussed.

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    Research Progress on Corrosion of Welded Joints
    Jing ZHANG, Haixin LI, Ziqiang YIN, Zhenlin YANG, Yongpeng DU, Xiangfeng KONG, Xin YUAN, Shoubiao LI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 661-670.   DOI: 10.11903/1002.6495.2018.083
    Abstract   HTML   PDF (692KB)

    Different corrosion types and the relevant corrosion research methods are summarized and analyzed. The research status of the corrosion of welded joints is introduced, namely the uniform corrosion, intergranular corrosion, pitting, galvanic corrosion, stress corrosion, crevice corrosion and weld hydrogen damage. While the application of array electrode technology, electrochemical scanning probe technique and numerical simulation technology in the corrosion research of welded joints is presented.

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    Application of Atmospheric Corrosion Monitoring Technique for Atmospheric Corrosion of Al-alloys
    Xiaohe WANG, Mingqiu WANG, Bowen LI, Chuang TAI
    Corrosion Science and Protetion Technology. 2018, 30 (6): 671-675.   DOI: 10.11903/1002.6495.2018.025
    Abstract   HTML   PDF (1785KB)

    The corrosion behavior of several Al-alloys in an accelerated atmospheric corrosion environment was studied by means of ACM technique, and the correlation between the corrosion coupon method and the ACM technique was also examined. Results show that ACM technique can effectively reveal the corrosion characteristics of Al-alloy in the accelerated test environment and response to environmental changes with very high sensitivity. The results obtained by ACM technology and corrosion coupon method are basically consistent when the corrosion of 2A12 aluminum alloy is studied in salt spray environment, and the two measurement methods exhibit good correlation.

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    Case Study on Inspection and Optimization of Cathodic Protection for Gathering Pipelines in Sulige Gas Field
    Pengxin FENG, Kaoping SONG, Shuzhen YU, Zhijuan RU, Xiaohu ZHANG, Shiying HOU
    Corrosion Science and Protetion Technology. 2018, 30 (6): 676-682.   DOI: 10.11903/1002.6495.2018.028
    Abstract   HTML   PDF (2954KB)

    The cathodic protection (CP) system for a typical production block in Sulige gas field was surveyed for the purpose of systematic diagnosis. The operation situation of CP was thoroughly inspected along the current path from the rectifier via the environment to the pipeline system, and then optimized accordingly. Results show that the main factors, which led to CP inadequacy, were related to current loss caused by the insulation failure and the increased resistance of anode bed to earth, and the limited output of the rectifier. Moreover, it is found that the CP operation management for gathering pipelines were facing series of challenges, for instance, one cathodic protection facility was sheared simultaneously by several pipelines. The detection of a pipeline was disturbed by neighbor cathodic protection facilities, which results in difficulties for carrying out conventional manual testing and dissatisfied data accuracy and applicability. By taking effective measures for correcting CP anomalies, the CP system was further upgraded for the realization of intelligent management. The successful implementation of intelligent retrofit was proven to be effective to save manpower and investment, thereby to improve greatly the CP management level.

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