Nickel plated aluminum strip
In the fast-growing electronics industry, aluminum strips made from aluminum have been widely used. However, aluminum has poor resistance to acid and alkali corrosion, and can hardly be soldered, which greatly limits the application and development of aluminum strip. The best way to solve this problem is to use continuous nickel plating on aluminum strips. However, the nickel-plated aluminum strips prepared by this method have poor processing performance such as bending resistance. In view of the shortcomings of continuous nickel plating on aluminum strips, this article improves the traditional nickel plating system, adds sodium citrate and other additives to the watt system, improves the plating parameters, and prepares a high elongation performance, good bending resistance, and corrosion resistance. Excellent nickel-plated aluminum strips that can be used in the electronics industry, and use SEM, XRD and other analytical methods to characterize the surface morphology, crystal structure and other microstructures of nickel-plated aluminum strips, and analyze the impact of nickel-plated aluminum strips from the perspective of microstructure. The root cause of elongation and corrosion resistance. The specific research contents are as follows: (1) before the aluminum strip is nickel-plated, pre-plating a copper pre-plated layer with a thickness of 0.5 μm can effectively improve the binding force of the nickel plating layer and the substrate; (2) the concentration of sodium citrate on nickel plating Influence of elongation and corrosion resistance of aluminum strip. The results show that when the concentration of sodium citrate in the solution is 40 g / L, the elongation of the nickel-plated aluminum belt is higher; when the concentration of sodium citrate is 60 g / L, the corrosion resistance of the nickel-plated aluminum belt is better; (3) When the sodium citrate concentration was 40g / L, the current density and the thickness of the nickel coating were changed. The effects of the current density and the thickness of the nickel coating on the elongation and corrosion resistance of the nickel-plated aluminum strip were studied. The results show that as the current density decreases, the elongation and corrosion resistance of the nickel-plated aluminum belt increase. When the current density is 2A / dm ~ 2, the elongation and corrosion resistance of the nickel-plated aluminum belt are the best; nickel plating The thinner the thickness, the higher the elongation of the nickel-plated aluminum strip, and the better the processability.