Study on ionic liquid Al plating technology on surface of T9A-D spring for aerospace applications
The phenomenon of hydrogen evolution is easy to occur in the surface electroplating process of elastic metal materials,which reduces the safety and stability of the materials and causes the hidden danger of hydrogen embrittlement.The surface of T9A-D spring and sample was modified by ionic liquid plating technology,and the morphology characterization and related properties of the spring and sample were studied.The results show that the ionic liquid plating Al layer is macroscopically continuous,uniform,dense and consistent color.Microcosmically,Al coating has uniform grain size,compact arrangement and no defect.The coating on the cross section is well combined with the substrate,the interface is clear,no gap,the plating thickness is between 8.91-11.20 µm,the plating thickness is uniform.In terms of performance,after salt spray test,no white corrosion products appear at 96 h and no red corrosion products appear at 336 h,showing good corrosion resistance.After hydrogen content test,the spring hydrogen content does not change,spring after electroplating Al has no hydrogen embrittlement tendency.The fluctuation of spring elasticity value before and after aluminum plating is less than 1.8 N.The bonding force between the Al plating layer and the elastic matrix is good after grid detection and there is no shedding phenomenon.
Al platingionic liquidcorrosion resistancespringgrain
万方数据
维普
