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在电沉积Ni过程中,向镀液中加入介质小球,介质小球以不同频率冲击镀件表面对镀层形成机械研磨。用SEM观察镀层表面、截面形貌,用TEM、XRD研究镀层的微观结构与结晶状态,测试镀层的极化曲线(PC)与交流阻抗频谱(EIS)等电化学性能。测试镀层的显微硬度与抗拉强度等力学性能。结果表明:在电沉积Ni过程中,对镀层实施机械研磨使镀层表面变得光滑,镀层孔隙率降低,致密度增加,镀层厚度减小,机械研磨促进镀层表面与内部晶粒尺寸的明显细化及镀层内部的压应力形成,从而导致镀层的耐蚀能力显著增强,抗拉强度与硬度显著提高。
During electrodeposition of Ni, a medium bead is added to the bath, and the medium bead impinges on the surface of the plating member at different frequencies to form a mechanical polishing on the plating layer. The surface and cross-sectional morphology of the coating were observed by SEM. The microstructure and the crystalline state of the coating were investigated by TEM and XRD. The electrochemical properties such as polarization curve (PC) and electrochemical impedance spectroscopy (EIS) of the coating were tested. Test the coating hardness and tensile strength and other mechanical properties. The results show that during the electroless Ni deposition, mechanical polishing is applied to the coating to make the surface of the coating smooth, the porosity of the coating is reduced, the density is increased, the thickness of the coating is reduced, and the mechanical grinding promotes the obvious refinement of the surface and internal grain size And the formation of compressive stress within the coating, resulting in significantly increased corrosion resistance of the coating, tensile strength and hardness increased significantly.