Nondestructive activation process for titanium alloy prior to electroless nickel plating
[Introduction]The conventional pretreatment process for electroless nickel plating on titanium alloy,which involves zinc immersion,is cumbersome and utilizes many corrosive chemicals that can damage the substrate and negatively impact the environment.An efficient and nondestructive activation process for titanium alloy prior to electroless nickel plating is proposed to address the issues mentioned above.[Method]The surface of titanium alloy was initially heated to a specific temperature by using an electromagnetic induction heating device,and then the activation solution was uniformly sprayed onto it using an atomizer to form a firmly bonded layer of nickel particles.The activation process parameters were optimized through orthogonal test.The surface morphology and composition of the active nickel layer were analyzed by scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and energy-dispersive spectroscopy(EDS).The microhardness of the electrolessly plated Ni-P alloy coating was measured with a microhardness tester,and its adhesion was evaluated through thermal shock and cross-cut tests.[Result]A uniform and firmly boned nickel particle layer was formed on the surface of titanium alloy after activation,resulting in the successful electroless plating of Ni-P alloy coating with a microhardness of 588.5 HV and excellent adhesion.[Conclusion]The activation process proposed in this paper avoids the use of highly corrosive chemicals,not only has no damaging effect on the surface of titanium alloy substrate,but also has the advantages of environmental friendliness,simple operation,and low cost,showing a good application prospect.
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