用恒载荷试验、X射线结构分析、电化学测量和断口分析,研究了Ni-P化学镀层对冷拉和固溶304钢在沸腾的42％MgCl_2溶液中应力腐蚀开裂(SCC)的影响。结果表明,Ni-P镀层可显著提高冷拉304钢的SCC抗力,但对固溶304钢效果甚微。镀层晶化退火对提高304钢的SCC抗力不利;水淬处理却可进一步降低其SCC敏感性。文章探讨了Ni-P镀层的影响机制。
By means of constant load tensile test, X-ray analysis, electrochemicalmeasurement and fractography, the influence of Ni-P electroless plating on the stresscorrosion cracking (SCC) of the cold-drawn and solid solutioned 304 steel immersedin boiling 42%MgCl_2 solution at 143℃ has been investigated. The Ni-P electrolessplating may increase the resistance to SCC of cold-drawn 304 steel remarkably, yetof solid solutioned one no more. The crystallization annealing of plating is unfa-vourable for the increase of resistance to SCC of the steel, while water quenchingfrom 1050℃ may further decrease the susceptibility to SCC. The mechanism ofprotection of Ni-P electroless plating on SCC of 304 steel was discussed.
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