阴极保护对高强度埋地管道应力腐蚀影响的研究进展

通过对国内外相关文献的梳理，综述了阴极保护对高强度埋地管道应力腐蚀影响的研究现状。基于对相关文献SCC试验数据的统计分析，从涂层剥离、裂纹萌生、裂纹扩展速率等方面，探讨了阴极保护对高强度埋地管道应力腐蚀的影响。分析结果表明:过负的阴极电位和过高的强制电流会大幅增加涂层剥离；在裂纹萌生阶段，阴极保护有利于抑制X80和X100在近中性环境下的裂纹萌生，随着阴极电位的负移，裂纹萌生的数量增加，但裂纹深度降低，在相同试验条件下，X100的裂纹深度较X80更深；在阴极保护对SCC裂纹稳定扩展阶段的影响还有待进一步研究；在裂纹快速扩展阶段，随着阴极电位的负移，管线钢的SCC敏感性增加，强度越高越敏感，在近中性pH环境下，

Research Progress about the Effect of Cathodic Protection on Stress Corrosion Cracking of Buried High-strength Pipeline

The research status of the influence of cathodic protection on stress corrosion cracking of buried  high-strength pipeline is reviewed by sorting out relevant literature at home and abroad. Based on the statistical analysis of SCC test data in relevant literature, the influence of cathodic protection on stress corrosion cracking of  buried high-strength pipeline was discussed from aspects of coating peeling, crack initiation and crack propagation rate. The results show that excessive negative cathode potential and excessive impressed current will greatly increase the coating stripping. At the crack initiation phase, the cathode protection is conducive to inhibiting the crack initiation of X80 steel and X100 steel in near-neutral environment. With the negative shift of the cathode potential, the number of crack initiation increases, but the crack depth decreases. Under the same test conditions, the crack depth of X100 steel is deeper than that of X80 steel. The influence of cathodic protection on SCC crack propagation needs further study. In the rapid crack propagation phase, with the negative shift of cathode potential, the SCC sensitivity of pipeline steel increases, and the higher the strength, the more sensitive it is. In the near-neutral environment, X100 steel and X120 steel have higher SCC sensitivity under the self-etching potential. Finally, some suggestions for future research are proposed.