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

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Failure Analysis on Natural Gas Pipelines of 20 and 16Mn Steels
The failure analysis for a natural gas pipeline, made of 20 and 16Mn steels, 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 show that the areas w. . .
Corrosion Science and Protetion Technology, 0 Vol. (): 0-0    DOI: 10.11903/1002.6495.2017.115
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Microstructure and corrosion behavior in 5%NaCl solution of welded joints of 10Cr13Ni2 martensitic stainless steel PDF (578KB)
Study on Chemical Conversion of Al Alloy Extrusion Profile Based on the Bath Containing Tungstate and Titanate PDF (815KB)
Effects of stray current induced by trams on buried gas pipelines PDF (270KB)
Corrosion Inhibition of N80 Steel in HCl Acid Medium by Bis-Schiff Base PDF (761KB)
Failure Analysis of Enamel Coatings on Air Pre-heater in One Power Plant PDF (968KB)
Current Issue More>>
      20 January 2018, Volume 30 Issue 1 Previous Issue   
    Orginal Article
    Preparation of Cu-Co Spinel Coatings on 430 Stainless Steel by Electro-deposition and Post-oxidation
    Xue ZHANG, Chaoliu ZENG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 1-7.   DOI: 10.11903/1002.6495.2017.054
    Abstract   HTML   PDF (3143KB)

    Cu-Co alloy coatings can be prepared on ferritic stainless steel by electro-deposition in Co- and Cu-sulfate bath with citrate as complex agent. The effect of pH value of the electrolyte and the electrodeposition potential on the deposition process and microstructure of the coatings was investigated. In a range of pH value 4~6, Cu2+ can coordinate with citrate almost completely, while Co2+ remains to exist as simple ions. Since the deposition potential of the complexing Cu2+ is similar to that of the simple Co2+, co-deposition of Cu-Co alloy can be realized in the electrolyte with pH value within the above range. Coatings with a more stable chemical composition are obtained at pH value of 4. At pH=4 and deposition potential of -0.9~-1.1 VSCE, the Co/Cu (atomic fraction) increases with the increasing deposition potential. An optimal composition with Co/Cu of about 2 is acquired at pH=4 and deposition potential of -1 VSCE. After oxidation at 800 ℃ in air for 2 h, the Co-Cu alloy coating was converted into an adherent and compact three-layered scale composed of an external thinner CuO layer, a middle thicker Cu0.92Co2.08O4 layer and an inner Co3O4 layer.

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    Influence of Mg and Ti on Corrosion Behavior of A7N01 Al-alloy
    Cui HUANG, Shufang ZHANG, Jie HU, Xin WANG, Xiaomin WANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 8-14.   DOI: 10.11903/1002.6495.2017.046
    Abstract   HTML   PDF (6288KB)

    The influence of addition of Mg and Ti on the corrosion behavior of Al-alloy A7N01 was studied by means of electrochemical corrosion test and stress corrosion cracking test, as well as observation of microstructure of the two plates of the A7N01 with different Mg and Ti content. The results showed that the corrosion resistance of the plate 2# with low Mg content and high Ti content was worse in comparison with the plate 1# with high Mg content and low Ti content. The pits on surface of the plate 2# constantly grown and connected with each other, and the length of stress corrosion cracks of the plate 2# was longer than that of the plate 1#. While the corrosion potential was lower, and the corrosion current was higher for the plate 2#. The tow plates all showed fiber-like microstructure composed of η phase (MgZn2), Τ phase (Al2Mg3Zn3) and a phase containing Fe, Mn and Si. The plate 2# with high Ti content possessed refined grains which led to the decreasing of corrosion resistance. However, the plate 1# with high Mg content possessed lower amount second phase, thus exhibited higher corrosion resistance. Furthermore, the relatively higher amount of the phase containing Fe, Mn and Si in the plate 2# could deteriorate its anti-corrosion property due to the galvanic corrosion between that phase and the matrix.

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    Atmospheric Corrosion of Zn in Fujian Province and Prediction of Its Corrosion Rate
    Qingzhao NI, Deyuan LIN, Xiaolv ZHOU, Yunxiang CHEN, Nianwei DAI, Junxi ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 15-20.   DOI: 10.11903/1002.6495.2017.060
    Abstract   HTML   PDF (1297KB)

    Two kinds of Zn specimens with flat- and helix-shape respectively were exposed in atmospheres at 16 test sites in Fujian province for 1 a. The corrosion rates of Zn specimens in different atmospheric environments were collected, in the meanwhile the relevant corrosion rates of Zn were predicted by using a zinc coating life predictor (ZCLP) by taking the meteorological and environmental parameters of each test site into account. The results show that the corrosion rate of Zn is directly related to the atmospheric environment parameters. Except for the test sites in areas of Fuqing, Xiamen and Nan'an, the predicted values of corrosion rate of Zn are consistent with the measured values for the other 13 test sites. Finally, the reliability of corrosion rate of Zn obtained by atmospheric corrosion exposure test was analyzed in conjunction with the corrosion mechanism of Zn.

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    Inhibition Performance of N-cinnamylidene Methylamine Schiff-base for Q235 Steel in Sulfamic Acid
    Yongchang ZENG, Chaoyang FU
    Corrosion Science and Protetion Technology. 2018, 30 (1): 21-26.   DOI: 10.11903/1002.6495.2017.044
    Abstract   HTML   PDF (1682KB)

    The corrosion inhibitor N-cinnamylidene methylamine Schiff-base was synthesized. The synthetic product was qualitatively detected by Fourier transform infrared spectroscopy (FTIR). The inhibition performance of N-cinnamylidene methylamine Schiff-base on the corrosion of Q235 steel in 5% (mass fraction) sulfamic acid solution was studied by weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and scanning electron microscope (SEM). The results showed that the Schiff-base had a good inhibition effect at 70 ℃, and it was a mixed-type corrosion inhibitor. The adsorption of the Schiff-base on Q235 steel surface obeyed Langmuir adsorption isotherm, and was mainly chemical adsorption.

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    Electrochemical Corrosion Behavior of Q235B Carbon Steel Induced by Iron-oxidizing Bacteria and Sulfate Reducing Bacteria Biofilm Inreclaimed Water
    Haiya ZHANG, Yimei TIAN, Haolin CHEN, Rufang ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 27-34.   DOI: 10.11903/1002.6495.2017.080
    Abstract   HTML   PDF (2994KB)

    Corrosion behavior of Q235B carbon steel in the presence of iron-oxidizing bacteria (IOB) and sulfate reducing bacteria (SRB) biofilm in reclaimed water was studied by means of most probable number (MPN) method, scanning electron microscopy (SEM) and electrochemical testing technology. Results showed that: the simultaneous existence of iron-oxidizing bacteria and sulfate reducing bacteria biofilm could inhibit the corrosion process throughout the experiment course, while the corrosion mechanisms varied with the bacteria growth cycle. In contrast to the corrosion products of the steel formed in sterile water, the mixed film composed of iron-oxidizing bacteria and sulfate reducing bacteria, their metabolites and the corrosion products on the steel formed in the reclaimed water exhibits greater blocking effect, which induced the positive shift of open circuit potential, increase in corrosion current density, higher impedance value and suppress of corrosion process in the initial 20 d of immersion. After 20 d, the corrosion products suffered from spallation due to the large viscosity of the metabolites and the cathodic depolarization effect of SRB was weakened due to the decay of them, which all make the cathode Tafel slope βc larger and the charge transfer resistance higher than their counter parts in the sterile water, therefore, the corrosion process continues to be inhibited.

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    Seasonal Optimization of Sacrificial Anode Protection for Pipelines in Regions with Soil of High Resistivity
    Yanan WANG, Zili LI, Jianguo LIU, Gan CUI
    Corrosion Science and Protetion Technology. 2018, 30 (1): 35-40.   DOI: 10.11903/1002.6495.2017.076
    Abstract   HTML   PDF (2712KB)

    It usually assumes that soil medium is uniform in conventional cathodic protection numerical model. However, there is not any design computation model according to practical soil surroundings. In this paper, soil resistivity was used to characterize the soil heterogeneity, then the potential distribution model of cathodic protection for pipeline in heterogeneous regions soil was established. The simulation computation was carried out by BEASY. The results show that the pipeline will be under protection when Mg sacrificial anode sets are laid uniformly according to the current standard of sacrificial anode design. Due to the variation of relevant factors with the seasons change, the cathodic potential of the whole pipeline cannot be maintained within the reasonable level by adding more Mg sacrificial anode sets, instead laying Mg ribbon sacrificial anodes will enable the pipeline to be reliably protected in the region with soil of high resistivity.

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    Corrosion Characteristics of 20# Steel and Al-alloy 3004 Under Simulated Conditions for Air-cooled Condenser Tubes
    Jianfeng XIAO, Zhiping ZHU, Yue QIAO, Jie CAO, Longbiao TIAN
    Corrosion Science and Protetion Technology. 2018, 30 (1): 41-48.   DOI: 10.11903/1002.6495.2017.056
    Abstract   HTML   PDF (1017KB)

    A device was set up to simulate the actual operation environment of ACC, and then with which, the corrosion behavior of Al-alloy 3004 and carbon steel 20# steel was comparatively studied with the emphasis in the influence of temperature, dissolved oxygen, pH and flow rate of the media on the corrosion of the two materials. After corrosion test, the surface of the two materials was characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The results show that the corrosion rate of 20# steel steel is 10~100 times higher than that of Al-alloy 3004, in other words, the protectiveness of the oxide scale formed on Al-alloy 3004 is better than that on the 20# steel, the former oxide scale is uniform and compact, while the later one is loose and apt to spalling. In general, Al-alloy 3004 has a better application prospect.

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    Effect of Humic Acid on Corrosion Performance of Cast-iron Pipe in Reclaimed Water
    Cuimin FENG, Xinyue AN, Xinrui ZHANG, Xiaoxing YIN, Ziyu GUO, Xinyue LI
    Corrosion Science and Protetion Technology. 2018, 30 (1): 49-54.   DOI: 10.11903/1002.6495.2017.088
    Abstract   HTML   PDF (2662KB)

    Effect of humic acid on the corrosion performance of cast-iron in the yielding water of a reclaimed water plant in North China was studied in terms of corrosion mass loss, phase constituents of corrosion products and corrosion morphology evolution by means of mass change measurement, X-ray diffractometer (XRD) and scanning electron microscopy (SEM) etc. Results indicate that humic acid retards the corrosion in the early reaction period due to the formation of a stable adsorption film on the surface of cast iron, however, as time goes by it was destroyed gradually by growing corrosion fouling. It is noted that with the increasing amount of humic acid in the reclaim water, the corrosion rate of the cast-iron decreases first and then increases, while a minimum corrosion rate is observed in the reclaim water with a humic acid dose of 6 mg/L.

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    Corrosion Evolution of Q235B Steel in a Simulated High-temperature and High-humidity Coastal Atmosphere
    Gang PAN, Wenjuan CHEN, Ying WANG, Feihong WANG, Haining YAO
    Corrosion Science and Protetion Technology. 2018, 30 (1): 55-60.   DOI: 10.11903/1002.6495.2017.055
    Abstract   HTML   PDF (878KB)

    Evolution of the Q235B steel corrosion in a simulated high-temperature and high-humidity coastal atmosphere was investigated by dry/wet cyclic corrosion test, X-ray diffraction (XRD) and polarization curves measurements. The results indicate that, in the simulated coastal atmosphere, the corrosion rate of low carbon steel is greatest in the early stage. Then the corrosion keeps stable in the middle stage, while decreases rapidly in the later stage. Otherwise, the corrosion rate of the steel increases with growing Cl- content. Besides, the simulated coastal atmosphere promotes the formation of Fe3O4, while the formation of Fe3O4 in the rust layer decreases with the increasing Cl- content.

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    Preparation of Super-hydrophobic Surface of SiC/2024Al Composite Through Chemical Etching and Its Properties
    Ruilin ZHANG, Zhongning GUO, Shuzhen JIANG, Ming WU, Hongping LUO, Guan WANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 61-66.   DOI: 10.11903/1002.6495.2017.068
    Abstract   HTML   PDF (1252KB)

    Super-hydrophobic surface of SiC/2024Al composite was prepared firstly via a simple chemical etching method and then finishing with fluoroalkyl silane. The surface morphology of the etched SiC/2024Al composite was characterized by means of FSEM. Results show that after chemical etching, the polished surface of SiC particulates within SiC/2024Al composite becomes a surface with composite structures both in micro- and nano-scales, which was highly similar to that of the lotus-leaf surface. The optimal etching parameters were acquired that the concentration of etchant was 15% (mass fraction) HCl solution and the etching time was 2 min. After the post finishing with, the prepared super-hydrophobic surface exhibits a water contact angle of 157.02° and a tilting angle of 5°. The super-hydrophobic surface possesses comprehensive performance such as good stability and wear-resistance, as well as acid- and alkali-resistance. In addition, results of potentiodynamic polarization measurement reveal that the super-hydrophobic surface can obviously enhance the corrosion resistance of the composite material in 3.5%(mass fraction) NaCl aqueous solution.

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    Corrosion Resistance of Ion Assisted Deposition of Al-films on Mg-alloy AZ91D
    Fuda LIAO, Huijun HOU, Qian SHI, Fang HU, Songsheng LIN, Hezhong PEI, Guoliang ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 67-73.   DOI: 10.11903/1002.6495.2017.051
    Abstract   HTML   PDF (1337KB)

    In order to improve the corrosion resistance of Mg-alloy, single layered Al-film of 100 μm, and double layered Al-films of (25+25) and (50+50) μm were deposited on Mg-alloy AZ91D surface with ion assisted magnetron sputtering technology, which then were further treated by shot peening and chemical conversion treating. The microstructure and corrosion performance of the films were characterized by SEM, salt spray test and electrochemical means. Results show that the prepared films exhibit more or less the same surface morphology with fine broccoli-like grains. The cross-section of the double layered Al-films shows obvious an interface between the two layers. After shot peening and chemical conversion processing, the Al-film became denser with a chemical conversion film on top. The salt spray test results showed that the life time of the single layered Al-film of 100 μm was 6 h, however, that of the double layered Al-films of (25+25) and (50+50) μm were 72 and 460 h respectively. While the free corrosion current densities the double layered Al-films of (25+25) and (50+50) μm were 3.86×10-6 and 4.3×10-7 A/cm2 respectively, which are 2~3 orders of magnitude lower than that of the bare substrate.

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    Erosion-corrosion Performance of New Developed Erosion-corrosion Resistant Steel for Dredging
    Fengming SONG, Linxiu DU, Guosheng SUN, Jian NIU
    Corrosion Science and Protetion Technology. 2018, 30 (1): 74-78.   DOI: 10.11903/1002.6495.2017.071
    Abstract   HTML   PDF (1438KB)

    A new erosion-corrosion resistant steel with hardness of 450 HBW was developed via heat treatment and micro-alloying technology by taking its corrosion resistance into account. Then the free-corrosion potential and erosion-corrosion resistance of the steel in sea-water slurry was measured in comparison with those measured through the field-testing during dredging works. All the tested steel samples were characterized in terms of components of the mass loss due to erosion-corrosion. Experimental results indicate that the addition of Cr in steel is beneficial to reduce its free-corrosion potential i.e. to enhance the corrosion-resistance of the steel, in turn, its erosion-corrosion resistance was improved. The erosion-corrosion results measured by rotation method were consistent well with those acquired from practical applications. The weight loss is mainly caused by erosion, with a percentage of 68%. The corrosion alone contributed 1.6% percentage in erosion-corrosion weight loss, and the contribution of synergy of erosion and corrosion was more than 30%. So, the combination of higher erosion-resistance with appropriate lower corrosion-rate was a way to develop erosion-corrosion resistant steel for dredging pipes.

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    Oxidation of Nano Cr-particles and Its Effect on Preparation and Performance of Composite Coatings of Ni/nano Cr-particles
    Lijuan QIN, Yuanchao HUANG
    Corrosion Science and Protetion Technology. 2018, 30 (1): 79-83.   DOI: 10.11903/1002.6495.2017.082
    Abstract   HTML   PDF (3345KB)

    The variation of surface structure of Cr nano-particles with increasing soaking time in Ni-Cr plating bath and its sequent effect on electrodeposition and performance of the composite coatings of Ni/nano Cr-particles were investigated. Transmission electron microscopy (TEM) results show that the oxide shell developed on the Cr nanoparticles thickened with time, and then after long term soaking in the electrolyte an amorphous oxide film grown on top of the crystalline one already existed on the as received nano Cr-particles. This leads to the decrease of Cr content from 9.6% (mass fraction) to 4.1% for the plated composite coatings of Ni/nano Cr-particles, and which then induces the transformation of the oxide scale formed on the composite coating from the protective Cr2O3 scale to the less-protective scale composited mainly of NiO during high-temperature oxidation.

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    Research Status and Existing Problems of Regional Cathodic Protection Technology in Oil and Gas Transmission Stations
    Danping LU, Yanxia DU, Dezhi TANG, Wei DUAN
    Corrosion Science and Protetion Technology. 2018, 30 (1): 84-93.   DOI: 10.11903/1002.6495.2017.254
    Abstract   HTML   PDF (1020KB)

    In recent years, with the developing requirements for safety, regional cathodic protection technology has been widely used in oil and gas transmission station. For regional cathodic protection technology, four technical aspects including the determination of current demand for cathode protection, selection of CP methods and ground bed types, effects of grounding system on CP effectiveness and the numerical simulation technology were surveyed, summarized and discussed in this paper. Besides, corresponding problems existing in the four aspects were pointed out, which could provide reference for the application and development of regional cathodic protection technology in oil and gas stations.

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    Analysis of Interference of High-speed Rail Current with Cathodic Protection of Pipeline and Countermeasures
    Bo LIU, Yonggang ZHAO, Shuhua ZHAO, Shuli WANG, Lei CHEN
    Corrosion Science and Protetion Technology. 2018, 30 (1): 94-98.   DOI: 10.11903/1002.6495.2017.062
    Abstract   HTML   PDF (598KB)

    With the rapid development of high-speed railway (HSR) and oil-gas pipeline, more and more railways cross or parallel with pipelines, the interference of high-speed rail current with the pipeline cathodic protection system is becoming serious. DC- and AC-voltage were measured on the pipeline which is crossed with railway. It is found that when a pipeline is under cathodic protection with parameters within the designed range, such pipeline is less affected by DC, but AC voltage and AC density are out-of-range, which is belong to the strong level. To avoid possible corrosion due to the interference of HSR current, countermeasures such as solid coupler and remission line were proposed as discharge protection means.

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    A Comprehensive Cost Analysis Related to Anti-corrosion Design and Total Life Cycle of Coastal Engineering Constructions Assigned for Different Length of Service Life
    Pengsheng WANG, Shengnian WANG, Jianbo XIONG, Zhihong FAN
    Corrosion Science and Protetion Technology. 2018, 30 (1): 99-104.   DOI: 10.11903/1002.6495.2017.085
    Abstract   HTML   PDF (562KB)

    A cross-river engineering in coastal region of South China is concerned, where the engineering construction should encounter high temperature, high humidity and water of high salinity. To ensure the durability of constructions assigned for different length of service life, the relevant corrosion risks are assessed in different marine corrosion environments. Correspondingly, proper anti-corrosion measures are applied. By means of life cycle cost analysis, the anti-corrosion and economic performance of the anti-corrosion measures is evaluated comprehensively.

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