With the development of industrial production and science and technology, people have put forward various new requirements on the surface properties and appearance of the CNC machining of the aluminum alloy shell. For example, in the case of large-area electroplating of a CNC-machined aluminum alloy shell, people increasingly dislike the light emission The luster of the electroplating, the preference for smoky hues, and the subtle satin-like hues. Thus developed a plating alloy. Here is a brief introduction to several decorative finishes used in product finishes.
Aluminum alloy shell CNC machining electroplating tin – cobalt alloy
Electro-tin-cobalt alloy plating and electroplating cobalt color is relatively close, but more gentle, more people’s favorite. Currently used mostly to replace chromium. Coated cobalt is not easy to barrel plating, and electroplating tin – cobalt alloy can be applied to the small parts of the barrel. In addition, tin-cobalt alloy plating with excellent plating ability and barrel plating ability, which can be applied to complex shapes of the workpiece. If the bottom of the double layer of nickel plating, the corrosion resistance and no less than the electrochromic chrome. In order to prevent the discoloration of the surface, it should be treated with the method of immersion chromate, so as to improve its corrosion resistance.
It looks pale rose color, people feel very comfortable, and has excellent corrosion resistance. Good gloss surfaces are obtained, for example, on glossy substrates or on bright nickel plating, followed by tin-nickel alloy plating. If the matte surface (pear pattern) on the plating, you can reproduce the surface of the original situation. Plating layer plating capacity is very good, almost no leveling effect, which is suitable for applications requiring very thin lines and rotary plating products.
Aluminum alloy CNC machining copper – tin alloy
The low-tin bronze coating of aluminum alloy is pink or golden yellow in color, it has high anti-corrosion ability and good spin-rotating property. It is widely used as protective-decorative nickel underlayer in light industry, handicrafts, mechanical instrumentation and other industries. Tin bronze coating color is golden yellow, good corrosion resistance. Mainly used as a decorative chrome bottom. Aluminum alloy processing hardness and stability in the air than the low tin bronze coating high. However, due to the high tin content of the coating, the bottom layer of the protective decorative coating is easy to bloom after the chrome plating. This is a weak point of the bronze coating of the tin plate. High tin bronze coating with a beautiful silver white gloss and good polishing properties, high hardness and wear resistance, used in industrial design to replace silver or chromium as a reflective device, instrumentation, household goods and other protective – – Decorative surface coating.
