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运用极化曲线、循环极化曲线等电化学方法研究了17-4PH钢经不同工艺热处理后的耐海水腐蚀性能,并对腐蚀形貌和显微组织进行了观察和分析。结果表明:该不锈钢经固溶+调整处理后,在520℃时效4 h时可获最佳的耐海水腐蚀性能,且综合力学性能优良。在一定的温度和时间区间内,随着时效温度的升高及时效时间的延长,马氏体板条呈逐步细化的趋势且晶间析出物逐渐增多。在不同温度及时间的时效处理过程中,富Cu沉淀相的析出、长大及逆转变奥氏体的产生是导致其耐蚀性产生差异的主要原因。
The seawater corrosion resistance of 17-4PH steel after heat treatment was studied by polarization curves and cyclic polarization curves. The corrosion morphology and microstructure were observed and analyzed. The results show that the stainless steel can get the best seawater corrosion resistance after aging treatment at 520 ℃ for 4 h, and the comprehensive mechanical properties are excellent. In a certain temperature and time interval, with the aging temperature and aging time, martensite lath gradually refined and intergranular precipitates increased gradually. During aging treatment at different temperature and time, the precipitation, growth and reverse transformation of Cu-rich precipitate phase are the main reasons leading to the difference of corrosion resistance.