在850 ℃下，对2209双相不锈钢堆焊试样进行不同时间(15 min，30 min，1 h，2 h)的敏化处理. 通过浸泡试验和交流阻抗试验研究了敏化时间对2209双相不锈钢堆焊层耐点蚀性能的影响. 结果表明，对于不同时间敏化处理的试样，点蚀均起源于铁素体相；点蚀速率与敏化时间相关，敏化处理时间小于30 min时，堆焊层的点蚀失重不明显，当敏化时间大于30 min时，点蚀失重量明显上升. 阻抗谱结果显示容抗弧曲率半径随着敏化时间的增加呈不断减小的趋势，说明钝化膜的稳定性下降，耐点蚀性能下降，与浸泡试验的结果吻合.
The sensitization of 2209 duplex stainless steel surfacing layer was processed in different time (15 min, 30 min, 1 h, 2 h) under 850 ℃, and the influence of sensitization time on the pitting resistance of 2209 duplex stainless steel surfacing layer was studied by immersion experiment and EIS. These results showed that pitting corrosion originated from the ferrite phase in different time sensitized sample. Moreover, the pitting corrosion rate was correlated with the sensitization time, if sensitizing processing time was less than 30 min, pitting corrosion weightlessness of surfacing layer was not obvious, while it longer than 30 min, pitting corrosion weightlessness would increase obviously. The EIS supported, with the increasing of sensitization time, capacitive reactance curvature radius would decrease continuously. Which indicated that both the stability of the passive film and pitting resistance were decreased, being similar with the result of immersion experiment.
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