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电化学  2011 

阵列参比电极法研究316不锈钢焊缝腐蚀行为

, PP. 373-379

Keywords: 316不锈钢,焊缝,腐蚀,阵列参比电极

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Abstract:

应用自行研制的阵列参比电极技术,原位测量316不锈钢焊接样品在12%FeCl3溶液中的腐蚀电位分布,观察分析金相结构,同时利用电化学极化曲线、交流阻抗技术和扫描Kelvin探针对316不锈钢焊缝腐蚀作跟踪检测,并与阵列参比电极技术测量结果进行比较。结果表明,经焊接的316不锈钢样品在12%FeCl3溶液中,最初时刻焊缝区发生优先腐蚀,而母材区保持钝化状态;随着测量时间的延长,焊缝区域电位不断负移,局部腐蚀加剧,并达到最大值;经45min浸渍后,母材个别区域电位也发生负移,并发生腐蚀。阵列参比电极检测的结果与扫描Kelvin探针(SKP)检测的结果具有可比性,金属焊接过程产生的材料组织和成分的变化是导致316不锈钢焊接样品发生局部腐蚀的主要原因。

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