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 corrosion resistance property in artificial seawater of 17-4PH steel after different heat treatment processes was investigated by electrochemical tests, and the corrosion morphology and microstructure were also analyzed. The results indicated that after solution and intermediate treatments the steel showed the best corrosion resistance property and excellent mechanical properties while aging at 520℃ for 4 hours. The microstructure became finer and the precipitation in grain boundaries increased with the increase of aging temperature and time in a certain range. The reverted austenite and copper precipitates that separated out while aging treatment were the major determinants of the corrosion resistance property of 17-4PH steel.
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