A kind of nickel plating solution for aluminum alloy surface and preparation method thereof

Abstract

The invention relates to the related technical field of electroless nickel plating, and more particularly, the invention provides a nickel plating solution for aluminum alloy surfaces and a preparation method thereof. A first aspect of the present invention provides a nickel plating solution for an aluminum alloy surface, comprising the following components: 18-42 g / L nickel salt, 33-146 g / L organic acid and its salt, 17-35 g / L hypophosphorous acid Salt, 5~17mg / L stabilizer. The nickel plating solution with high phosphorus content provided by the invention can effectively improve the hardness of the coating layer and reduce the magnetic permeability through the combined action of hypophosphite, higher concentration nickel salts, organic acids and their salts, and specific stabilizers and penetrants. , while improving the formation time of the coating, and can ensure better brightness and flatness.

Description

technical field [0001] The invention relates to the related technical field of electroless nickel plating, and more particularly, the invention provides a nickel plating solution for aluminum alloy surfaces and a preparation method thereof. Background technique [0002] Aluminum alloys have low density, good corrosion resistance, high fatigue resistance, and high specific strength and specific stiffness, which are comparable to structural steel and even ultra-high-strength steel. They are widely used in the preparation of mobile phone components to reduce the structure of mobile phones Weight, and the current bracket material of the mobile phone lens is also molded by aluminum alloy. [0003] In actual use, the aluminum alloy has low hardness and poor wear resistance, but after electroless nickel plating, the surface hardness and wear resistance can be greatly improved. As a new surface treatment technology, electroless nickel plating is widely used in the above-mentioned m...

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Problems solved by technology

[0004] However, there are still some defects in most of the electroless nickel plating at present. For example, the nickel deposition rate and the stability of the plating solution have not reached a high-efficiency balance. Some have a faster plating rate in the first 20 minutes of plating, and the plating rate drops sharply after 20 minutes. The average plating speed is slow, the coating has poor bonding force, is easy to fall off, and the plating solution is unstable. It is prone to self-catalytic decomposition during high-temperature chemical nickel plating; there are also some nickel deposition rates that are too slow, and the plating cycle is too long and the efficiency is not good. High; more importantly, the magnetic permeability of the aluminum alloy surface nickel-plated workpiece prepared at present is relatively high, and it is easy to cause adverse effects on the mobile phone signal during the use of the mobile phone lens holder.

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