固溶处理对ZG40Cr25Ni20Si2耐热钢耐蚀性能的影响

采用动电位极化曲线、电化学阻抗谱、中性盐雾试验、光电子能谱研究了固溶处理(固溶温度1080℃,保温时间90 min)对ZG40Cr25Ni20Si2不锈钢耐腐蚀性能的影响.结果表明:在此固溶处理参数下,处理后的试样腐蚀电位下降,腐蚀电流密度升高,容抗弧尺寸明显低于铸态,耐腐蚀性能降低.中性盐雾试验中在96 h内固溶态和...

Effect of solution treatment on corrosion resistance of ZG40Cr25Ni20Si2 heat-resistant steel

Effect of solution treatment(solution temperature of 1080 ℃, holding time of 90 min) on corrosion resistance of the ZG40Cr25Ni20Si2 stainless steel was studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy, neutral salt spray test and photoelectron spectroscopy. The results show that under this solution treatment parameter, after the solution treatment, the corrosion potential of the steel decreases, the corrosion current increases, the capacitance arc size is obviously lower than that of the as-cast one, and the corrosion resistance decreases. In neutral salt spray test, there is no obvious corrosion morphology in the as-cast and solution treated specimens within 96 h. After 144 h, the mass loss of the solution treated specimens is slightly larger than that of the as-cast one, and corrosion is more likely to occur.