| 引用本文: | 王莹,俞宏英,程远,孙冬柏.X80钢在伊川土壤模拟溶液中的腐蚀行为[J].材料科学与工艺,2013,21(3):129-136.DOI:10.11951/j.issn.1005-0299.20130320. |
| WANG Ying,YU Hong-ying,CHENG Yuan,SUN Dong-bai.Corrosion behavior of X80 steel in simulated solution of ichuan soil[J].Materials Science and Technology,2013,21(3):129-136.DOI:10.11951/j.issn.1005-0299.20130320. |
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| X80钢在伊川土壤模拟溶液中的腐蚀行为 |
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王莹1,2,俞宏英2,程远1,2,孙冬柏1,2
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（1. 北京科技大学 国家材料服役安全科学中心,北京100083;
2. 北京科技大学 腐蚀与防护中心,北京100083）
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| 摘要: |
| 采用失重法、阳极极化曲线、光学显微镜、扫描电镜（SEM）及X射线衍射（XRD）等方法研究了X80钢在伊川土壤模拟溶液中的腐蚀行为.结果表明,X80钢在模拟溶液中的腐蚀行为与HCO3-、CO32-、SO42-和Cl-离子的浓度有关.随HCO3-或CO32-浓度增加,X80钢的阳极溶解电流密度都呈现出先增加后减小的趋势；X80钢钝化的临界HCO3-或CO32-浓度分别为0.008 mol/L或0.005 mol/L.在低于临界HCO3-或CO32-浓度下,SO42-和Cl-浓度的增加都促进了X80钢的阳极活性溶解；而在高于临界HCO3-或CO32-浓度下,X80钢的钝化性能随SO42-或Cl-浓度的增加而减弱.在90 d浸泡期内,X80钢在模拟溶液中的腐蚀形态为全面腐蚀；其腐蚀速率随浸泡时间的增加而呈逐渐增大的趋势.
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| 关键词: X80钢 土壤模拟溶液 离子浓度 腐蚀机理 |
| DOI：10.11951/j.issn.1005-0299.20130320 |
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| Corrosion behavior of X80 steel in simulated solution of ichuan soil |
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WANG Ying1,2, YU Hong-ying2, CHENG Yuan1,2, SUN Dong-bai1,2
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(1.National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083 China; 2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083 China)
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| Abstract: |
| Corrosion behavior of X80 steel immersed in simulated solution of Yichuan soil was investigated using Weight Loss, Anodic Polarization Curve, Optical Microscopy, Scanning Electron Microscopy and X-ray Diffraction methods. The results indicate the corrosion behavior of X80 steel in simulated solution is related to the concentration of HCO3-, CO32-, SO42- and Cl-. The anodic dissolution current density of X80 steel increased first and then decreased with the increasing concentration of HCO3- or CO32-; critical concentrations forming passive films of HCO3- and CO32- were 0.008 and 0.005 mol/L, respectively. When increasing concentrations of SO42- and Cl-, the anodic active dissolution of X80 steel would be accelerated with HCO3- or CO32- concentration lower than the critical value, while weakened with HCO3- or CO32- concentration higher than that. Uniform corrosion occurred on the X80 steel surface exposed in simulated solution for 90 days, and corrosion rate of X80 steel gradually increased with the time. |
| Key words: X80 steel, soil simulated solution, ions concentration, corrosion mechanism
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