阴极保护机理的介绍与浅议
Introduction and Discussion of Cathodic Protection Mechanisms
摘 要
对三种阴极保护机理，包括阳极溶解减缓机理、免蚀机理以及钝化机理，进行了详细的介绍。阐述了这些机理中存在的不足，指出阳极溶解减缓理论中的“开路电位”应为“平衡电极电位”，免蚀机理与阳极溶解减缓机理有相似性。针对阴极保护钝化机理的质疑，仍需通过阴极保护下金属表面状态及金属/电解液界面特性研究对该机理的适用性进行评判。
钝化
免蚀
腐蚀电池
极化
cathodic protection
passivation
immunity
corrosion cell
polarization
Abstract
Three cathodic protection mechanisms are introduced in detail, including mitigation of anodic dissolution, immunity and passivation. The deficiencies in these mechanisms are expounded. It is point out that the “open circuit potential” in the theory of mitigation of anodic dissolution should be “equilibrium electrode potential”, and the mechanism of immunity is similar to the mechamism of mitigation of anodic dissolution. In view of the doubts about the passivation mechanism of cathodic protection, it is still necessary to evaluate the applicability of the mechanism through the study of metal surface state and interface characteristics between metal and electrolyte under cathodic protection.
中图分类号 TG174 DOI 10.11973/fsyfh-202108013
所属栏目 杂散电流干扰与阴极保护
基金项目
收稿日期 2020/10/29
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引用该论文: LIU Guo. Introduction and Discussion of Cathodic Protection Mechanisms[J]. Corrosion & Protection, 2021, 42(8): 76
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参考文献
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【2】Control of external corrosion on underground or submerged metallic piping systems:NACE SP0169-2013[S]. Houston:NACE International,2013.
【3】Corrosion of metals and alloys-vocabulary:ISO 8044:2020[S]. Geneva,Switzerland:ISO,2020.
【4】MEARS R B,BROWN R H. A theory of cathodic protection[J]. Transactions of the Electrochemical Society,1938,74(1):519.
【5】HOAR T P. The electrochemistry of protective metallic coatings[J]. Transactions of the IMF,1938,14(1):33-46.
【6】HOAR T P. The electrochemical behaviour of the tin-iron couple in dilute acid media[J]. Transactions of the Faraday Society,1934,30:472.
【7】MVLLER W J. The effect of cathodic reactions on the corrosion of metals from the viewpoint of the local cell theory[J]. Transactions of the Electrochemical Society,1939,76(1):167.
【8】GUMMOW R A,FIELTSCH W,SEGALL S M. Would the real -850 mV (CSE) criterion please stand up[C]//Corrosion 2012. Houston,TX:NACE International,2012:1337.
【9】EVANS U R. Metallic corrosion,passivity and protection[M]. 2nd ed. London:Edward Arnold & Co.,1946.
【10】BARLO T J,BERRY W E. An assessment of the current criteria for cathodic protection of buried steel pipelines[J]. Materials Performance,1984,23:9(9).
【11】KOBAYASHI T. Effect of environmental factors on the protective potential of steel[C]//Proceedings of the 5th International Metallic Congress. Tokyo:[s.n.],1972.
【12】GUMMOW R A,SEGALL S,FINGAS D. An alternative view of the cathodic protection mechanism on buried pipelines[J]. Materials Performance,2017,56(3):32-37.
【13】LEEDS S. A Review of what happens at the metal/electrolyte interface when cathodic protection is applied[C]//CEOCOR International Congress and Exhibition. [S.l.]:CEOCOR,2013.
【14】LEEDS S,LEEDS J. What Factors Influence The criteria for protection of structures subject to an impressed current cathodic protection system[C]//CEOCOR International Congress and Exhibition. [S.l.]:CEOCOR,2015.
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