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在AZ31镁合金化学镀镍磷的过程中施加机械研磨作用,获得了具有新特性的镍磷镀层。扫描电镜观察表明,施加机械研磨获得的镍磷镀层的晶粒细化、致密性提高、消除了镀层中的孔隙。镀层截面的形貌结果显示,与传统化学镀镍磷层相比,施加机械研磨后镀层与基体的结合处形成了一个合金化的过渡区域,使镀层与基体的结合力得到显著的提高。由动电位极化曲线测试结果可知,施加机械研磨后镀层的自腐蚀电位提高到-0.2 V(相对SCE),相对传统化学镀镍磷层的电位提高了0.9 V(相对SCE),耐蚀性能显著提高。
In the process of AZ31 magnesium alloy electroless Ni-P coating mechanical grinding effect obtained with the new features of nickel-phosphorus coating. Scanning electron microscopy showed that the grain refinement and mechanical properties of nickel-phosphorus coatings obtained by mechanical milling improved the porosity of the coatings. The morphology of coating cross-section shows that compared with traditional electroless Ni-P coating, the mechanical grinding of the coating and substrate at the junction of the formation of an alloying transitional region, the coating and the substrate binding capacity has been significantly improved. The results of the potentiodynamic polarization curve show that the corrosion potential of the coating increased to -0.2 V (relative to SCE) after mechanical grinding, and the corrosion resistance was improved by 0.9 V (relative to SCE) Significantly increased.