Ca2+对X65钢腐蚀产物膜保护性能的影响
Effect of Ca2+ Concentration on Protection Properties of X65 Steel Corrosion Scale
摘 要
采用在腐蚀介质中添加Ca2+的方法,利用高温高压釜对X65钢进行了四组在不同Ca2+浓度下的腐蚀试验,测量了腐蚀速率.用扫描电镜(SEM)观察了腐蚀产物膜的微观形貌并统计了晶粒大小,对在不同Ca2+浓度下成膜的X65钢进行了电化学极化曲线和交流阻抗谱(EIS)分析.结果表明Ca2+可以吸附在基体表面,在成膜过程中加速了介质中反应物的反应速率,从而在阳极区形成阻碍Fe2+扩散的膜,使阳极极化、阳极电位升高,最终导致Ecorr升高,从而增加腐蚀产物膜的致密性.但Ca2+并没有使腐蚀机理发生变化.Ca2+浓度升高后,拟合电路中出现了Warburg阻抗,此时电化学反应主要受扩散控制.
腐蚀产物膜
Ca2+浓度
交流阻抗谱(EIS)
极化曲线
X65 pipe steel
corrosion scale
Ca2+ concentration
EIS
polarization curve
Abstract
The effect of Ca2+ on the electrochemical protection of X65 pipeline steel was studied by the way of adding Ca2+ to the simulated solution.The corrosion rate and grain size were measured and SEM was used to get the micromorphology of the corrosion scales.The electrochemical impedance spectroscopy (EIS) and polarization curves were used to investigate the corrosion scales formed in different Ca2+ concentration.The results showed that Ca2+ could adhere to the matrix and accelerate corrosion rate.The corrosion scales in anodic region could restrain Fe2+ diffusing and improve anodic potential,and raise Ecorr.Ca2+ did not change the corrosion mechanism.When Ca2+ concentration increased,Warburg impedance appeared in the fitting circuit,and the electrochemical reaction was controlled by diffusion.
中图分类号 TG174.1
所属栏目 试验研究
基金项目
收稿日期 2008/9/4
修改稿日期 2008/9/24
网络出版日期
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引用该论文: DING Chen,GAO Ke-wei,CHEN Chang-feng. Effect of Ca2+ Concentration on Protection Properties of X65 Steel Corrosion Scale[J]. Corrosion & Protection, 2009, 30(10): 693～696
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参考文献
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【2】Linter B R,Burstein G T.Reaction of pipeline steels in carbon dioxide solutions[J].Corros Sci,1999,42:117.
【3】Wu S L,Cui Z D,Zhao G X,et al.EIS study of the surface film on the surface of carbon steel from supercritical carbon dioxide corrosion[J].Applied Surface Science,2004,228(1-4):17.
【4】Palacios C A,Shadley J R.Characteristics of corrosion scales on steels in CO2-saturated NaCl brine[J].Corrosion,1991,47(2):122-127.
【5】Xia Z,Chou Szklarska-Smialowska Z K C.Pitting corrosion of carbon steel in CO2-containing NaCl brine[J].Corrosion,1989,45(8):636.
【6】Rushing J C,McNeill L S,Edwards M.Some effects of aqueous silica on the corrosion of iron[J].Water Research,2003,37:1080-1090.
【7】张国安,陆民旭,吴荫顺.CO2腐蚀产物膜的微观形貌和结构特征[J].材料研究学报,2005,19(5):537-548.
【8】陈长风,陆民旭,赵国仙,等.N80钢CO2腐蚀电极过程交流阻抗分析[J].金属学报,2002,38(7):770-774.
【9】Jiang X,Zheng Y G,Qu D R,et al.Effect of calcium ions on pitting corrosion and inhibition performance in CO2 corrosion of N80 steel[J].Corrosion Science,2006,48:3091-3108.
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