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[目的]不锈钢包钢复合材料在接地工程中应用广泛，但其焊缝区的腐蚀失效是影响构件寿命的主要隐患，因此要通过可靠的方法对焊缝区的腐蚀失效行为进行研究。[方法]采用扫描电镜、显微硬度计、电化学工作站等手段，对比分析焊缝区与非焊缝区的微观组织、显微硬度及电化学腐蚀行为。[结果]不锈钢包钢由母材区、热影响区(HAZ)和焊缝区3个典型区域构成。焊缝热影响区存在晶粒粗化及晶界铬元素贫化现象，显微硬度显著高于母材。电化学测试表明，去除腐蚀产物后焊缝区的本征电荷转移电阻比母材低5个数量级，腐蚀电流密度较母材高2个数量级。点蚀试验与酸性氯化物加速腐蚀试验进一步证实，腐蚀优先发生在焊缝区并快速发展为宏观裂纹。[结论]本研究证明了焊缝区是不锈钢包钢构件的腐蚀薄弱部位，对该类材料的耐久性评价与工程应用具有一定的指导意义。
Abstract：[Objective] Stainless steel-clad steel composite materials are widely used in grounding engineering, but the corrosion failure in its weld zone remains a critical threat to the service life of components. Therefore, it is necessary to study the corrosion failure behavior of the weld zone using reliable methods. [Method] The microstructure, hardness, and electrochemical corrosion behavior of the weld zone and non-weld zone were compared and analyzed using scanning electron microscope(SEM), microhardness tester, and electrochemical workstation. [Result] The stainless steel-clad steel consists of three typical regions such as the base metal zone, the heat-affected zone(HAZ), and the weld zone. Grain coarsening and chromium depletion at grain boundaries were observed in the HAZ, where the microhardness was significantly higher than that of the base metal. Electrochemical tests revealed that after corrosion product removal, the intrinsic charge transfer resistance of the weld zone was five orders of magnitude lower than that of the base metal, while the corrosion current density was two orders of magnitude higher. Pitting corrosion tests and accelerated corrosion experiments in acidic chloride solutions further confirmed that corrosion preferentially initiates in the weld zone and rapidly develops into macroscopic cracks. [Conclusion] This study demonstrates that the weld zone is the corrosionvulnerable region in stainless steel-clad steel components, providing valuable insights for durability assessment and engineering applications of such materials.
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基本信息:
DOI：10.19289/j.1004-227x.2026.02.006
中图分类号:TG172
引用信息:
[1]裴锋,贾蕗路,刘书君,等.不锈钢包钢焊缝区的腐蚀失效行为研究[J].电镀与涂饰,2026,45(02):43-51.DOI:10.19289/j.1004-227x.2026.02.006.
基金信息:
国网江西省电力有限公司重点科技项目(521820250008)