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采用失重法、常规电化学测试和扫描开尔文探针(SKP)技术研究了X56钢焊接接头在海水中的腐蚀,从而得到X56钢焊接接头在海水中的电偶腐蚀特点。结果表明,试样的腐蚀产物分两层。腐蚀速率由大到小的排序为焊缝>母材>热影响区。焊缝的腐蚀电流密度最大,电荷转移电阻最小;电偶电流随时间的增加逐渐稳定。另外,母材作为阳极得到了保护。随着浸泡时间的增加,SKP图中偶接界面处越来越明显。
The corrosion of X56 steel welded joint in seawater was investigated by weight loss method, conventional electrochemical test and scanning Kelvin probe (SKP) technique. The galvanic corrosion of X56 steel welded joint in seawater was obtained. The results show that the corrosion product of the sample is divided into two layers. The corrosion rates are descending order of weld> base metal> HAZ. The corrosion current density of the weld is the largest and the charge transfer resistance is the smallest. The galvanic current gradually stabilizes with time. In addition, the base metal is protected as an anode. With the increase of immersion time, the coupling interface in SKP map becomes more and more obvious.