Galvanic Corrosion of a Carbon Steel-Stainless Steel Couple in Sulfide Solutions
Galvanic Corrosion of a Carbon Steel-Stainless Steel Couple in Sulfide Solutions
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DOI：
10.1007/s11665-011-9839-x
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发表时间：
2011-02
影响因子：
2.3
通讯作者：
C. Dong;K. Xiao;X. G. Li;Y. F. Cheng
中科院分区：
文献类型：
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作者：
C. Dong;K. Xiao;X. G. Li;Y. F. Cheng
通过电化学测试、浸泡试验和表面表征，研究了不同阴阳极面积比的碳钢-不锈钢电偶在与空气平衡的S2-−溶液中的电偶腐蚀行为。结果表明，碳钢阳极的电偶腐蚀效应随阴/阳极面积比的增大而增大，随溶液中S2-−浓度的增加而减小。碳钢表面形成一层硫化物薄膜，保护其免受腐蚀。当阴阳极面积比为1：1时，动电位极化曲线法与失重法测得的电偶腐蚀效应一致。随着阴阳极面积比的增大，电化学法可能不能准确地确定电偶效应。碳钢的阳极溶解电流密度不能简单地用电流密度来近似。
The galvanic corrosion behavior of carbon steel-stainless steel couples with various cathode/anode area ratios was investigated inS2−-containing solutions, which were in equilibrium with air, by electrochemical measurements, immersion test, and surface characterization. It is found that the galvanic corrosion effect on carbon steel anode increases with the cathode/anode area ratios, and decreases with the increasing concentration of S2−in the solution. A layer of sulfide film is formed on carbon steel surface, which protects it from corrosion. When the cathode/anode area ratio is 1:1, the potentiodynamic polarization curve measurement and the weight-loss determination give the identical measurement of the galvanic corrosion effect. With the increase of the cathode/anode area ratio, the electrochemical method may not be accurate to determine the galvanic effect. The anodic dissolution current density of carbon steel cannot be approximated simply with the galvanic current density.