Surface treatment method for aluminum or aluminum alloy and product prepared thereby

Abstract

The invention provides a surface treatment method for aluminum or aluminum alloy, which mainly comprises the following steps of offering an aluminum matrix or an aluminum alloy matrix; forming a metallic nickel layer on the surface of the aluminum matrix or the aluminum alloy matrix treated by activation by adopting a replacement reaction manner, wherein a treatment fluid is adopted in the process of forming the metallic nickel layer, and the treatment fluid mainly comprises nickel sulfate, sodium citrate, sodium potassium tartrate terahyddrate and sodium hydroxide; and carrying out chemical nickel plating treatment on the aluminum matrix or the aluminum alloy matrix so as to form a chemical nickel plating layer on the metallic nickel layer. The invention also provides aluminum products or aluminum alloy products prepared by the method. The aluminum products or the aluminum alloy products have good corrosion resistance and abrasion resistance.

Description

technical field [0001] The invention relates to a method for surface treatment of aluminum or aluminum alloy and products made by the method. Background technique [0002] Electroless nickel plating on aluminum or aluminum alloy can not only improve the corrosion resistance, wear resistance, weldability and electrical contact performance of aluminum or aluminum alloy, but also make aluminum or aluminum Alloys have new functions, such as magnetic properties, lubricity, etc. However, electroless nickel plating directly on aluminum or aluminum alloy substrates is difficult to obtain an electroless nickel plating layer with better bonding force and compactness. [0003] In order to solve the above problems, in the prior art, electroless nickel plating is usually performed on the surface of aluminum or aluminum alloy after "dipping zinc twice". However, this process has the following disadvantages: in the electroless nickel plating process, the zinc-impregnated layer is easy to...

AI Technical Summary

Problems solved by technology

However, this process has the following disadvantages: in the electroless nickel plating process, the zinc-impregnated layer is easy to dissolve and produce zinc ions, which can accelerate the decomposition speed of the electroless plating solution, greatly shorten the service life of the electroless plating solution, and increase the production efficiency of the electroless nickel plating solution at the same time. Deal with environmental pollution; the undissolved galvanized layer is covered by the electroless nickel plating layer. In a humid corrosive environment, the galvanized layer constitutes the anode of the corrosion battery relative to the electroless nickel plating layer. The galvanized layer will be subject to lateral corrosion, which is easy lead to the peeling off of the electroless nickel layer

Images