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

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Failure Analysis on Natural Gas Pipeline of 20 Steel and 16Mn Steel
The failure analysis for a natural gas pipeline, composed of pipes of 20 steel and 16Mn steel, was performed by means of examination of macro-morpholopy, metallograph, inclusion analysis as well as scanning electron microscope examination and chemical analysis for the relevant materials. Results sho. . .
Corrosion Science and Protetion Technology, 2018 Vol. 30 (2): 195-201    DOI: 10.11903/1002.6495.2017.115
 
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The Development Status of the Field Signature Method at Domestic and Foreign PDF (388KB)
2018-07-05
Effect of Pre-strain on Stress Corrosion Cracking of 2297 Al-Li Alloy in the Temper of Peak Ageing PDF (668KB)
2018-07-05
Corrosion evolution characteristics of Q235B steel in the O3/Cl– composite atmosphere PDF (979KB)
2018-07-05
Microbiological Influenced Corrosion and Microbiological Influenced Corrosion Inhibition --Overview and A case application in oilfield produced water PDF (460KB)
2018-07-05
PDF (311KB)
2018-07-05
Current Issue More>>
      20 July 2018, Volume 30 Issue 4 Previous Issue   
    Pitting Corrosion of Several Super Stainless Steels in a Simulated Water Environment of Low Temperature Multi Effect Desalination Unit
    Changgang WANG, Lin ZHAO, Liping WU, Fang XUE, Xuehui HAO, Junhua DONG, Wei KE
    Corrosion Science and Protetion Technology. 2018, 30 (4): 339-345.   DOI: 10.11903/1002.6495.2017.207
    Abstract   HTML   PDF (2702KB)

    The pitting corrosion behavior of stainless steels 316, 904L, 2507 and 254sMo in a twofold condensate sea water at different temperature was investigated, which aims to simulate the water environment encountered in low temperature multi effect desalination unit, by means of electrochemical cyclic polarization test and SEM. Results show that the increase of temperature can reduce the stability of passivation films of stainless steels 316, 904L, 254sMo and 2507 and increase their pitting sensitivity. Serious pitting corrosion occurred on the surface of 316 stainless steel at different temperatures, while no obvious pitting corrosion was found on stainless steels 254sMo and 2507. At low temperature, the stainless steel 904L presented higher pitting potential, smaller pitting size and lower pitting tendency. However, at high temperature, its pitting potential decreased significantly, pitting size increased and pitting corrosion tendency became larger.

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    Influence of Polarization Potential on Electrochemical Behavior of X70 Steel in Marine Environment with SRB
    Xu CHEN, Bing WANG, Xiaoyi REN, Wenjing CHEN, Ming WU, Dejie CHEN, Chunhua WANG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 346-352.   DOI: 10.11903/1002.6495.2017.255
    Abstract   HTML   PDF (1265KB)

    During the service of submarine oil and gas pipeline, the applied cathodic protection and microorganisms are inescapable coexistence in the marine environment. Cathodic protection has significant influence on the microbial activity, thus affecting the corrosion process of the oil and gas pipeline. In this work, optical density method and electrochemical impedance spectra were adopted to investigate the effect of polarization potential on the growth circle of sulfate reducing bacteria and the electrochemical behavior of X70 pipeline steel in simulated sea water. Results showed that by open circuit potential, the growth cycle of SRB could be differentiated into two stages: logarithmic phase and decline phase. The amount of SRB reached the peak value by the ninth day, then the bacteria entered the decay phase. Under the effect of applied anodic electric field, SRB propagation was inhibited and died rapidly after entering the logarithmic growth phase. While under the cathodic electric field, the mitotic cycle of SRB was shortened and the rate of cell division was increased, which promoted the propagation of SRB. However, the cathodic electric field also accelerated the death of SRB. In the growth period of SRB, the optimum cathodic protection potential of X70 steel in the marine environment was -0.85 V (SCE), while SRB entered the death period, the cathodic polarization promoted the hydrogenation reaction instead.

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    Electrochemical Corrosion Behavior and Inter-granular Corrosion Mechanism of 6082 Al-alloy
    Jiqiang SHAN, Dandan HOU, Jinjie ZHANG, Xiucheng XIN, Guohua CAO, Genzhe HUANG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 353-361.   DOI: 10.11903/1002.6495.2017.256
    Abstract   HTML   PDF (7374KB)

    ABSTRUCT The inter-granular corrosion behavior and the relevant corrosion mechanism of 6082 Al-alloys subjected to different homogenization treatments were investigated. Results show that, with the rising temperature and/or time of the homogenization process, the corrosion product Al(OH)3 increases, and thus the scale thickens gradually while the corrosion current density decreases, which implies the enhancement of the corrosion resistance of the alloy. In addition, the corrosion current density of the forged alloy is much smaller than that of the extruded one, accordingly its corrosion resistant performance is better. There are two kinds of second phase particles, Si- and AlMnFeSi-phase, homogeneously distributed within the plastic deformation streamline of the alloy. When the alloy with second particles of Si-phase was immersed in a corrosive solution, the matrix around particles dissolved preferentially and corrosion cracks form as the matrix serves as anode and Si particles serve as cathode, i.e. they form micro-galvanic cells. Meanwhile, corrosion cracks develop into networks due to the existence of electro-chemical corrosive coupling between β ?-Mg2Si and PFZ along the grain boundaries.

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    Comparison of Crevice Corrosion Susceptibility of 2205 Duplex Stainless Steel and 304 Stainless Steel in Hydrofluoric Acid Solution
    Xuguang PANG, Yier GUO, Jiapeng CHI, Ping LIANG, Yanhua SHI, Yan ZHAO
    Corrosion Science and Protetion Technology. 2018, 30 (4): 362-368.   DOI: 10.11903/1002.6495.2017.200
    Abstract   HTML   PDF (2387KB)

    The crevice corrosion behavior of 2205 duplex stainless steel (2205DSS) and 304 stainless steel (304SS) in 5% (mass fraction) HF solution was comparatively investigated by means of immersion test, cyclic polarization curve, electrochemical impedance spectroscopy, electrochemical noise and potentiostatic test methods. The results showed that the two stainless steels all suffered from crevice corrosion, but the corrosion pits of 2205DSS was relatively shallow, while that of 304SS was deeper with larger corroded area. In comparison to 304SS, 2205DSS exhibits higher critical potential (Ecrev) and repassivation potential for (Erp) crevice corrosion, while smaller area of hysteresis loop, as well as larger charge transfer resistance and film resistance. The white noise level of 2205DSS was smaller, indicating a slower corrosion reaction for crevice corrosion. Meanwhile, by the same applied potential, 2205DSS presents longer induction period for crevice corrosion and smaller crevice corrosion current density. Therefore, 2205DSS exhibited better crevice corrosion resistance than 304SS, which was mainly related to the difference in compositions and properties of the passive films formed on the surface of the two materials.

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    Comparative Study of Measurement Accuracy of Corrosion Mass Loss for Corroded Pure Copper Pickled with Three Kinds of Pickling Solutions
    Xingchen LIU, Kun LI, Zhuoyuan CHEN, Xiaoying SUN, Jiarun LI
    Corrosion Science and Protetion Technology. 2018, 30 (4): 369-374.   DOI: 10.11903/1002.6495.2018.027
    Abstract   HTML   PDF (4486KB)

    The identical specimens of corroded pure copper were pickled with three kinds of pickling solutions in accordance with the international standard (ISO 8407) and then the relevant corrosion mass loss was measured. It follows that the mass loss acquired after pickling with these solutions is distinctively different due to the disproportionation reaction of cuprous ions. The subsequent comparison shows that the corrosion mass loss of samples pickled with hydrochloric acid are quite close to the actual ones. This's because the chloride ions in the hydrochloric acid solution would complex with the cuprous ions and therewith prevent them from the disproportionation reaction during the pickling process. Finally, in view of easy operation and measurement accuracy, the non deoxygenated hydrochloric acid solution is recommended as removal liquor to clean away the corrosion products on copper for determining the corrosion mass loss.

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    Correlation of Aging Behaviour Exposed in Hot and Humid Environment and Assessed by Indoor Accelerated Test for Protective Coating on Al-alloy Used for Rail Transit
    Huaqiang LIN, Min ZHAO, Wenchao DUAN, Tao WEI, Hongwei SHI, Changsheng LIU, Fuchun LIU, En-Hou HAN
    Corrosion Science and Protetion Technology. 2018, 30 (4): 375-380.   DOI: 10.11903/1002.6495.2018.053
    Abstract   HTML   PDF (850KB)

    The correlation of aging behaviour of protective coating on Al-alloy used for rail transit in the area of hot and humid (such as Guangzhou area) was studied comparatively with that assessed by indoor accelerated test. The combination of aging induced by Xenon lamp radiation, humidity cabinet test and salt spraying test was used as an indoor accelerated aging method. While the evolution of gloss, colour difference and infrared spectrogram of the coatings were monitored in the two test processes. After 6 cycles of indoor accelerated aging and outdoor exposure for 2 a, the results indicate that the change of colour difference presents the best correlation between the two tests methods, and it takes the second place for gloss. No correlation could be found from the change of infrared spectrograms . It can be peculiarly concluded that the change of colour difference induced by 1 cycle indoor test corresponding to an equivalent environment spectrum designed for Guangzhou area is close to that induced by the real outdoor exposure in Guangzhou area for 10 months.

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    Influence of pH Value on Pitting Corrosion Behavior of 304 Stainless Steel Used for High Salinity Wastewater
    Huijuan MA, Yan NIU, Yanhong GU, Jie ZHAO, Juntie CHE, Xiaoyan CHE
    Corrosion Science and Protetion Technology. 2018, 30 (4): 381-388.   DOI: 10.11903/1002.6495.2017.249
    Abstract   HTML   PDF (4929KB)

    Pitting corrosion behavior of 304 stainless steel (304SS) in high salt wastewater with pH values such as pH=3 (acidic), pH=6.8 (neutral) , pH=12.6 (alkaline), was studied by means of cyclic polarization curve, Motty-Schotty curve (M-S) and scanning vibrating electrode technique (SVET) measurements. Results show that the hysteresis loop area on the cyclic polarization curve in the pH=3 solution is greater than that in pH=6.8 and pH=12.6, indicating that the pitting corrosion rate of the steel in the acidic solution is greater than that in neutral and alkaline ones. Motty-Schotty experiments show that the passive film formed in acidic solution on the steel presents characteristics of P-type semiconductor, while those in neutral and alkaline solution presents characteristics of N-type semiconductor. SVET data show that the corrosion current density of the steel increases with time. Among others the corrosion current density of the steel in the acidic solution is the largest, showing the most serious corrosion. SEM morphology after corrosion rectified this conclusion.

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    Influence of Zr Content on Microstructure and Corrosion Resistance of Mg-2Zn Alloy
    Guangyan FU, Jie MENG, Huanzhang XIE
    Corrosion Science and Protetion Technology. 2018, 30 (4): 389-394.   DOI: 10.11903/1002.6495.2017.250
    Abstract   HTML   PDF (2800KB)

    Mg-2Zn alloys with different Zr contents namely Mg-2Zn, Mg-2Zn-0.5Zr and Mg-2Zn-1Zr were prepared by mechanical alloying and vacuum hot-pressing sintering method. The microstructure and corrosion behavior of the three alloys were studied by means of X-ray diffractometer (XRD) and optical microscope (OM) as well as immersion test and potential polarization curve measurement in simulated body fluid (SBF). Results show that the grain size of Mg-2Zn alloy is coarse and which was refined through Zr-alloying, the grain size of Mg-2Zn-0.5Zr alloy is the minimum about 2 μm, while that of Mg-2Zn-1Zr alloy is about 5 μm. Comparative immersion test results reveal that the corrosion rate of Mg-2Zn alloy is the largest, while that of Mg-2Zn-0.5Zr alloy is the smallest. The free-corrosion current density of Mg-2Zn alloy is the largest, while that of 0.5Zr alloy is the smallest indicating the best corrosion resistance of Mg-2Zn-0.5Zr alloy.

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    High Temperature Oxidation Resistance of Pt/Zr-modified Aluminide Coating
    Qixiang FAN, Tiegang WANG, Xiaoxiao TAN, Wenguo HUO
    Corrosion Science and Protetion Technology. 2018, 30 (4): 395-400.   DOI: 10.11903/1002.6495.2018.082
    Abstract   HTML   PDF (5137KB)

    A Pt/Zr-modified aluminide coating on a directionaly solidified Ni-based superalloy was prepared via a two-step process, namely a Pt thin layer was firstly electrodeposited on the alloy and then which was zirconium-aluminized through pack cementation. The isothermal oxidation behavior of the alloy with Pt/Zr-modified aluminide coating at 1000 ℃ was examined in air, and results showed that the main phase in the outer part of the Pt/Zr -modified aluminide coating was β-(Ni, Pt) Al phase with little PtAl2 and PtZr phases. There was abundant beneficial β-NiAl phase remaining in both the Pt-modified aluminide coating and Pt/Zr-modified aluminide coating indicating that the two coatings possessed good oxidation resistance. But the Pt/Zr-modified aluminide coating possessed lower oxidation rate and denser oxide scale than the Pt-modified aluminide coating, which might be due to that some strip-like oxide pegs rich in Zr formed beneath the alumina scale and which played a role in anchoring the oxide scale.

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    Corrosion Behavior of Fe-3.5B Alloy in Liquid Al at 720~800 ℃
    Jingfu LIU, Lili FENG, Guangzhu LIU
    Corrosion Science and Protetion Technology. 2018, 30 (4): 401-406.   DOI: 10.11903/1002.6495.2017.238
    Abstract   HTML   PDF (2342KB)

    Corrosion behavior of Fe-3.5B (mass fraction,%) alloy in liquid Al at 720~800 ℃ was investigated by means of static immersion test, scanning electron microscopy, energy dispersive spectrometer and X-ray diffractometer. Results indicated that Fe-3.5B alloy shows a stable corrosion behavior at different temperatures. During corrosion a layer composed of intermetallic compounds of Fe-Al and Fe2B-phase formed on the surface of Fe-3.5B, which can effectively protect the substrate from liquid Al corrosion through separating liquid Al from the matrix and hindering the inward diffusion of Al. The temperature of liquid Al has significant effect on the type of the formed Fe-Al compounds, the morphology of the residual Fe2B-phase, as well as the structure of interface layer.

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    Corrosion Behavior of Mg96.8Gd2Zn1Zr0.2 Alloy Processed by Equal Channel Angular Pressing Technique
    Guozhen WANG, Aibin MA, Jinghua JIANG, Fumin LU
    Corrosion Science and Protetion Technology. 2018, 30 (4): 407-412.   DOI: 10.11903/1002.6495.2017.206
    Abstract   HTML   PDF (4143KB)

    Ingot of Mg96.8Gd2Zn1Zr0.2 (atomic fraction,%) alloy containing long-period stacking order (LPSO) phases was melted then processed from 1 to 16 passes by equal-channel angular pressing (ECAP) technique to produce the alloy with ultra-fined grains (UFG). Results of optical microscope observation showed that the grains of the alloy were gradually refined and homogenized with increasing the ECAP pass. The coarse X-Mg12ZnGd phases went through the process of distortion, crack, broken and dispersion. Due to the reduction in defects, the UFG alloy after ECAP shows higher corrosion resistance than that of the cast ones. The corrosion resistance of the UFG alloy increases first, and then decreases with the increasing ECAP passes.

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    Electrochemical Performance of Al-Zn-In-Mg Sacrificial Anode in Cold Seawater
    Haitao WANG, Shi XU, Hui WANG, Hongren WANG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 413-418.   DOI: 10.11903/1002.6495.2017.261
    Abstract   HTML   PDF (3212KB)

    The corrosion behavior and working performance of Al-Zn-In-Mg sacrificial anode were studied in natural seawater at 3 and 20 ℃ respectively by means of gravimetric test, measurements of constant current polarization and potentiodynamic polarization, as well as electrochemical impedance spectroscopy, metallographic microscope, SEM with EDX. Results indicated that Al-Zn-In-Mg anode had good activation behavior in cold and normal temperature seawater. The Al-Zn-In-Mg anode presented uniform surface dissolution with electric capacities of 2678 and 2571 Ahkg-1 in natural seawater at 3 and 20 ℃respectively. The open-circuit potential and closed-circuit potential of the anode in cold seawater were more negative relative to that in normal temperature one. The electrochemical performance of Al-Zn-In-Mg anode in cold seawater was better than that in normal temperature seawater, which was due essentially to the decreased self-corrosion rate of the anode in cold seawater.

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    Influence of Siliconizing on High Temperature Oxidation Behavior of Mo-12Si-8.5B-(8Cr) Alloys
    Zhijun WU, Jianhui YAN
    Corrosion Science and Protetion Technology. 2018, 30 (4): 419-425.   DOI: 10.11903/1002.6495.2017.204
    Abstract   HTML   PDF (4794KB)

    In order to improve the oxidation resistance of Mo-12Si-8.5B-(8Cr) alloys at high temperature in air, silicide coatings were prepared on the surface of Mo-12Si-8.5B-(8Cr) alloys by park cementation method. Then their microstructure and high temperature oxidation behavior were assessed. Results show that continuous and dense silicide coatings were successfully prepared on the surface of Mo-12Si-8.5B-(8Cr) alloys. The growth rate of silicide coating on Mo-12Si-8.5B-8Cr alloy is about two times quicker than that on Mo-12Si-8.5B alloy. The bare alloys without silicide coating exhibited poor oxidation resistance at 800~1200 ℃. However the mass gain of Mo-12Si-8.5B and Mo-12Si-8.5B-8Cr alloys with silicide coatings oxidized at 1200 ℃ are only 0.22 and 0.24 mg/cm2, respectively. The oxidation resistance of Mo-12Si-8.5B-(8Cr) alloys was enhanced remarkably after siliconizing, which may be attributed to a continuous and dense SiO2 scale formed on the coating surface.

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    Anticorrosion Properties of Citric Acid Doped Composite Coatings of Polyaniline/silicon Sol
    Yufeng LI, Jiyu LI, Shi QI, Zheng YAO, Jingjing ZHU
    Corrosion Science and Protetion Technology. 2018, 30 (4): 426-430.   DOI: 10.11903/1002.6495.2017.203
    Abstract   HTML   PDF (980KB)

    A kind of doped polyaniline (PANI-CA) was synthesized with citric acid (CA) as dopant by using chemical oxide method. After mixed with silicon sol which prepared by sol-gel method, it was applied to the surface of Q235 steel to prepare anticorrosion composite coatings. The structure of PANI-CA and silicon sol was characterized by Fourier transform infrared spectrum (FTIR). The influence of different content of PANI-CA on the hydrophobicity, adhesion and anticorrosion performance of the composite coatings were investigated. Results showed that the composite coating with 4% PANI-CA presented better hydrophobic and anticorrosion properties with such as contact angle 115.4° to water, water absorption 5.84%, corrosion current density 2.34×10-7 Acm-2 and electrochemical impedance value up to 106 Ωcm2.

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    Effect of Process Parameters on Corrosion Behavior of SiC/Cu Co-continuous Composites in NaCl Aqueous Solution
    Fengqi LI, Xiaoming CAO, Jinsong ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 431-434.   DOI: 10.11903/1002.6495.2018.049
    Abstract   HTML   PDF (4429KB)

    The corrosion behavior of SiC/Cu Co-continuous composites in 3.5% (mass fraction) NaCl aqueous solution was investigated by means of corrosion weight-loss method and SEM. The results showed that the mass loss per unit area increased with the increase of SiC aperture when the volume fraction of SiC kept constant. The mass-loss per unit area increased with the increase of SiC volume fraction while the aperture of SiC kept constant.

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    Survey on Fouling of Steam Generators in Nuclear Power Plants
    Jinna MEI, Yaolei HAN, Pingping CHU, Fei XUE, Qunjia PENG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 435-440.   DOI: 10.11903/1002.6495.2017.201
    Abstract   HTML   PDF (1580KB)

    During the operation of nuclear power plants, fouling occurs on tube sheets, heat transfer tubes, support plates and crevices between tubes and tube support plates in steam generator. The fouling in steam generator not only aggravates the corrosion of the steam generator itself, but also leads to a steam outlet pressure decrease, which then affects the safe, economic and highly efficient operation of nuclear power plants. The fouling problem of steam generators was reviewed in terms of the relevant formation mechanisms and key influencing factors, as well as the detrimental effect of the fouling (including scale and sludge) on the steam generator. Finally, detection methods, cleaning- and control-measures for the fouling were also introduced.

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    Current Status of Research on Anticorrosion Mechanism and Vapor Phase Preparation Technique of Uperhydrophobic Film on Metallic Materials
    Kai ZHANG, Bangwei WEN, Yong TAN
    Corrosion Science and Protetion Technology. 2018, 30 (4): 441-448.   DOI: 10.11903/1002.6495.2017.153
    Abstract   HTML   PDF (3934KB)

    More and more researchers have focused on superhydrophobic film in the recent two decades for its advantages such as self-cleaning, non-wetting, antifouling and anti-biological fouling, which could effectively protect metal from corrosion. Anticorrosion mechanism of superhydrophobic films was reviewed, in terms of the relation between micro/nano dual coarse-structure and surface energy, the hydrophobicity, air cushion effect and capillary effect of the superhydrophobic film. The research status on the relevant anticorrosion- and corrosion failure-mechanism was also expounded. Since the vapor phase preparation presents advantages such as the superiority of simple operation, low cost, environment friendly, wide applicable scope, good reproducibility and film homogeneity, the current status of the vapor phase preperation methods of superhydrophobic film for corrosion and protection was reviewed, such as CVD by ambient-pressure and -temperature, PECVD and AACVD with their advantages and drawbacks. In view of the existing insufficient, corresponding research direction were put forward.

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    Technology Status and Problems Analysis of Pre-embedded Electrochemical Sensors for Rebar Corrosion Monitoring
    Yanbing TANG, Zhihong LIU, Yanxin QIAO, Pingyi GUO, Gang LIU, Baigong WU, Hao GUO
    Corrosion Science and Protetion Technology. 2018, 30 (4): 449-453.   DOI: 10.11903/1002.6495.2017.224
    Abstract   HTML   PDF (2087KB)

    Corrosion monitoring of rebar could reflect the durability condition of the concrete structures real-timely and non-destructively. Monitoring technique based on electrochemical principle is proven, which is used in many important engineering projects all over the world. Herein, the technology status of the pre-embedded electrochemical sensors for corrosion monitoring of rebar was introduced. The problems of the application of sensors in practical engineering projects were analyzed, which could be useful for popularization and application of the sensors and also for improvement of their accuracy in application.

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    Research Progress on Corrosion of Carbon Steel During Process of Capture CO2 with Monoethanolamine Solution
    San HE, Chaoyang GAO, Ling ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (4): 454-458.   DOI: 10.11903/1002.6495.2017.226
    Abstract   HTML   PDF (625KB)

    This paper analyzes the corrosion mechanism of carbon steel during the process of capture CO2 with monoethanolamine (MEA) solution in terms of the effect of O2 concentration, MEA concentration, solution temperature, CO2 concentration and heat stable salts on the corrosivity of the MEA-CO2 solution. The results show that there exist electrochemical reactions in the MEA-CO2 solution, the anode reaction is that iron losses electrons to generate iron ions, the cathodic reaction results in free water, hydrated hydrogen ions, bicarbonate ions and oxygen gaining electrons. The main corrosion products are FeCO3, Fe(OH)2, Fe(OH)3. The rise of O2 concentration, MEA concentration, solution temperature and CO2 concentration will increase the corrosivity of the solution. Different types of heat stable salts have different effect on the corrosivity of the solution, among which the oxalate has the greatest effect on the corrosivity of the solution. The corrosion problem in the CO2 capture process is usually alleviated by adding corrosion inhibitor. Inorganic corrosion inhibitor presents good corrosion inhibition effect, but with high toxicity. Organic corrosion inhibitor toxicity is low, but with poor corrosion inhibition effect.

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