研究了激光熔凝—稀土扩渗复合处理工艺对GCr15钢耐腐蚀 性能及微观组织的影响.结果表明，与单纯经过扩渗稀土表面处理试样对比，复合处理试样 耐腐蚀性能明显改善.在酸性介质中，极化电流密度和致钝化电流密度减小，致钝化电位向 负方向移动，钝化区加宽；循环伏安曲线所包围的面积明显减小，腐蚀电流密度大大降低. 采用SEM和XRD测试分析了经过复合处理GCr15钢耐腐蚀性能改善的机理.
This paper studies the effects on corrosion resista nce of GCr15 steel surface and its microstructure using the multiple treatment o f RE permeation combined with laser melting solidification.The results show that the corrosion resistance of samples with multiple treatment has been improved s ignificantly,in comparison with those treated only by RE permeation.Under acid e nvironment,both polarization current density and passivation current density rem ain low and polarization potential moves to negative-going direction,resulting i n a broader passivation zone; in addition,the enclosed area in cyclic voltammete r curves is decreased obviously with a sharp reduction of corrosion current dens ity.SEM and XRD are applied for analyzing the improvement mechanism of corrosion resistance.
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