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用SEM、EDS和XPS等方法对35CrMoA钢激光相变硬化和低温离子渗硫复合改性层进行形貌观察和成分分析,使用显微硬度计测量复合改性层横截面的显微硬度分布,使用电化学腐蚀系统测试复合改性层在3.5%NaCl溶液中的耐蚀性。结果表明,渗硫层是一个连续的黑色带状层,与基体之间没有明显过渡,厚度在2～5μm之间,主要成分是FeS及FeSO4。渗硫层表面平整疏松,局部有小坑和“火山口”形貌。复合改性层是理想的摩擦表面,自腐蚀电位为-571 mV,自腐蚀电流密度为26.02μA/cm2,与基材相比,耐蚀性有一定的提高。
The morphology and composition analysis of the laser-induced phase-change hardening and the low-temperature ion-sulfurized composite modified layer of 35CrMoA steel were carried out by SEM, EDS and XPS methods. The microhardness distribution of the cross-section of the composite modified layer was measured by micro- Corrosion resistance of composite modified layer in 3.5% NaCl solution was tested using an electrochemical corrosion system. The results show that the percolation layer is a continuous black ribbon with no obvious transition to the matrix with a thickness of 2 ~ 5μm. The main components are FeS and FeSO4. Sulfur layer surface smooth, local small pits and “crater ” topography. The composite modified layer is an ideal friction surface with a self-corrosion potential of -571 mV and a self-corrosion current density of 26.02 μA / cm2. Compared with the substrate, the corrosion resistance is improved.