Scholarlink

<p>The combined effect of alternating current (AC) and cathodic protection (CP) was investigated in a weakly alkaline soil-simulated solution, and the joint mechanism has been illustrated. The results reveal that the superimposition of AC and CP has a dual effect on corrosion and SCC of pipeline steel. Appropriate CP potential range can effectively protect steel from corrosion under AC interference. However, either insufficient or over-protected potentials may cause severe pitting corrosion and increase the risk of SCC. The reason is ascribed to the potential fluctuation range and electrochemical state on steel surface. In this work, large and deep corrosion pits were observed at − 775&#xa0;mVSCE and − 1200&#xa0;mVSCE under 10&#xa0;mA/cm<sup>2</sup> AC interference, and the SCC susceptibility was considerably increased. In contrast, the application of CP potentials between − 950&#xa0;mVSCE and − 1050&#xa0;mVSCE largely reduced the corrosion and SCC risk under AC interference.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Combined Effect of Alternating Current Interference and Cathodic Protection on Stress Corrosion Cracking Behavior of X80 Pipeline Steel

  • 期刊论文

  • 发表日期：

    2025年8月18日

查看全文
  • Mengfei Pan,
  • Chao Liu,
  • Ningning Li,
  • Hongchi Ma,
  • Zhiyong Liu

摘要

The combined effect of alternating current (AC) and cathodic protection (CP) was investigated in a weakly alkaline soil-simulated solution, and the joint mechanism has been illustrated. The results reveal that the superimposition of AC and CP has a dual effect on corrosion and SCC of pipeline steel. Appropriate CP potential range can effectively protect steel from corrosion under AC interference. However, either insufficient or over-protected potentials may cause severe pitting corrosion and increase the risk of SCC. The reason is ascribed to the potential fluctuation range and electrochemical state on steel surface. In this work, large and deep corrosion pits were observed at − 775 mVSCE and − 1200 mVSCE under 10 mA/cm2 AC interference, and the SCC susceptibility was considerably increased. In contrast, the application of CP potentials between − 950 mVSCE and − 1050 mVSCE largely reduced the corrosion and SCC risk under AC interference.