用恒载荷和慢应变速率应力腐蚀试验方法研究了Ni和Ni-P合金镀层对不锈钢在MgCl_2溶液中和对碳钢在NaOH溶液中应力腐蚀的防护作用,并考察了应力和电位的影响。完整的镀层能完全防止应力腐蚀产生。当镀层存在缺陷或裂纹时,镀层的电位对其防护性能有重要影响。在利用金属镀层控制应力腐蚀时,镀层应有良好的延展性,同时对应力腐蚀应具有电化学保护功能,
The effect of Ni and Ni-P coatings on the SCC behaviour of stainless steel in boiling 42%MgCl_2 solution and that of mild steel in 100℃, 35%NaOH solution was investigated. A perfect Ni or Ni-P coating prevented these two steels from SCC under the test conditions. In the presence of defects or cracks in the coating, the SCC behaviour of the steels would depend on the potential of the coating. SCC can be effectively controlled by metallic coating when the potential of the selected coating is located in the region in which the base metal is insensitive to SCC.
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