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首先,将预处理后的合金样品在碱式碳酸镍溶液中进行预镀,目的是在镁锂合金表面形成一层Ni-P合金薄膜;然后,在硫酸镍溶液中进行二次镀覆,获得具有保护作用的镀层。对获得的镀层的表面形貌、结构和抗腐蚀能力进行研究。结果表明:采用该方法能够在镁锂合金表面形成平整、光亮、致密的镀层,镀层与基体结合良好。镀层中磷含量达到13.56%(质量分数),镀层的维氏硬度约为HV549。极化曲线测试表明,Ni-P镀层的腐蚀电位升高至-0.249V(vsSCE),并有一个很宽的钝化区,这种现象显示该镀层具有良好的抗腐蚀能力。
First, the pretreated alloy sample is pre-plated in a basic nickel carbonate solution to form a Ni-P alloy film on the surface of the magnesium-lithium alloy; and then, secondary plating is performed on the nickel sulfate solution to obtain Protective coating. The surface morphology, structure and corrosion resistance of the obtained coating were studied. The results show that this method can form a flat, bright and dense coating on the surface of Mg-Li alloy with a good combination of coating and substrate. Plating phosphorus content reached 13.56% (mass fraction), Vickers hardness of the coating is about HV549. Polarization curve tests showed that the corrosion potential of Ni-P coating increased to -0.249V (vsSCE) and had a wide passivation zone. This phenomenon shows that the coating has good corrosion resistance.