New technology for plating golden yellow on automotive hub

Abstract

The present invention discloses a technology for plating golden yellow on an automotive hub. The technology comprises the technical steps: galvanizing, pre-plating copper, brightly plating copper, plating nickel, plating golden yellow, and the like. The chemical composition formula contained in each L of plating solution is that: galvanizing solution comprises 220 to 240g of potassium chloride, 40 to 55g of zinc chloride, 30 to 35g of boric acid, and 15 to 25ml of brightener; copper pre-plating solution comprises 70 to 85g of copper pyrophosphate, 280 to 350g of pyrophosphoric copper potassium, 4 to 6ml of ammonia water, and 3 to 5ml of brightener; the bright copper plating solution comprises 200 to 220g of copper sulfate, 70 to 90g of sulfuric acid, 0.06 to 0.08g of chloride ion, and 4 to 8ml of brightener; nickel plating solution comprises 260 to 300g of nickel sulfate, 30 to 50g of nickel chloride, 30 to 40g of boric acid, 0.6 to 1ml of brightener, 8 to 12ml of softening agent, and 2 to 4ml of wetting agent; and golden yellow plating solution comprises 120 to 140g of imitation gold salt and 2 to 4ml of ammonia water. After the plating, water washing and drying are performed, and a polyurethane paint is sprayed on the surface of the automotive hub. The new technology for plating golden yellow on the automotive hub radically eliminates the damage and environmental pollution of sodium cyanide and chromic anhydride to human bodies; the plated golden yellow automotive hub is luxurious and attractive, has strong corrosion resistance, and is suitable for high-class automotive assembly.

Description

technical field [0001] The invention relates to an electroplating process, in particular to an electroplating process for an automobile wheel hub. Background technique [0002] With the continuous development of automobiles and the expansion of market demand, the variety of automobiles is increasing day by day, and the types are constantly improving, and the surface protection of automobile wheels is also being strengthened. Taking car wheels as an example, most of them are made of aluminum alloy, and the surface is electroplated with nickel-chromium coating. The process route is rough polishing, degreasing, water washing, pickling, zinc dipping, zinc stripping, secondary zinc dipping, pre-copper plating, acid plating Copper, nickel plating, chrome plating, water washing, and finally hot air drying, and water washing between each process step from pickling to chrome plating. The nickel plating process steps include semi-bright nickel plating, high sulfur nickel plating, brig...

AI Technical Summary

Problems solved by technology

However, the production cost of this process is high and the process is complicated. Sodium cyanide is used in the pre-copper plating process step, and chromic anhydride is used in the chrome plating process step. These chemical elements are extremely toxic and easily pollute the environment and cause harm to the human body.