The relationship between microstructure and alternating current (AC) corrosion behavior of X80 pipeline steel was systematically studied in CO₃²⁻/HCO₃⁻ solution using corrosion tests and surface analysis technology. The results show that AC prevents the formation of passive film and decreases its stability. AC generates a different damage effect to the passive film on steels with various microstructures. The passive film of normalized microstructure steel has a relatively high stability, followed by the hot-rolled steel, and that of the annealed sample is the most unstable. The influence of AC on passive film of steels with various microstructures causes a difference in the corrosion resistance. The corrosion form of steels with different microstructures applied with AC displays the obvious characteristic of localized corrosion. The normalized microstructure has the optimum corrosion resistance, followed by the hot-rolled steel, and the annealed steel possesses the worst corrosion resistance. The difference in the AC corrosion behavior of X80 steels may be related to the microstructure.

中文翻译：

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交流电对碳酸盐/碳酸氢盐溶液中不同组织的管线钢钝化膜和腐蚀行为的影响

微观结构和X80管线钢的交变电流（AC）的腐蚀行为之间的关系进行了系统研究在CO ₃ ^2- / HCO ₃ ^-解决方案使用腐蚀测试和表面分析技术。结果表明，AC阻止了钝化膜的形成并降低了其稳定性。AC对具有各种微观结构的钢上的钝化膜产生不同的损伤作用。正火微结构钢的钝化膜具有相对较高的稳定性，其次是热轧钢，而退火样品的钝化膜最不稳定。AC对具有各种微观结构的钢的钝化膜的影响导致了耐蚀性的差异。交流电对不同组织的钢的腐蚀形式表现出明显的局部腐蚀特征。正火组织具有最佳的耐腐蚀性，其次是热轧钢，退火钢具有最差的耐腐蚀性。