采用SEM方法研究不同温度固溶处理的690合金组织结构,利用动电位极化、电化学阻抗和局部电化学交流阻抗（LEIS）等方法研究了其在NaOH溶液中的电化学行为。SEM结果表明,固溶处理温度1095℃的690合金的晶粒较大,晶界上分布着连续的碳化物。极化曲线结果表明,固溶处理温度1090℃的690合金在氢氧化钠溶液中的电流密度最大;电化学阻抗表明,固溶处理温度1100℃的690合金在氢氧化钠溶液中的阻抗模值较大。局部电化学交流阻抗谱表明,不同温度固溶处理的690合金在氢氧化钠溶液中的电化学阻抗具有明显不同的分布特征。
Microstructure of alloy 690 solid-solutioned at different temperatures was investigated by SEM.Electrochemical behavior of alloy 690 in NaOH solution was examined by means of potentiodynamic polarization,electrochemical impedance spectroscopy（EIS） and localized electrochemical impedance spectroscopy（LEIS）.SEM result shows that grain size of alloy 690 solution-treated at 1095 ℃ is larger than that of the alloy treated at 1090 ℃ and 1100 ℃.Carbides at grain boundaries are observed in the alloy solution-treated at different temperatures.It is shown that the alloy 690 solutioned at 1090 ℃ exhibits the largest corrosion current density in NaOH solution.EIS result indicates that the impedance value of alloy 690 solutioned at 1100 ℃ in NaOH solution is higher than other specimens.LEIS results demonstrate that the surface localized electrochemical impedance spectroscopy of alloy 690 heat treated at different temperatures presents different distribution feature.
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