With the development of science and technology, people put forward a variety of new requirements on the surface performance and appearance of CNC machining of aluminum alloy shell.Thus, electroplating alloys were developed.Several decorative electroplating alloys used in product finishes are briefly introduced.
1, aluminum alloy shell CNC processing electroplate tin - cobalt alloy
Tin-cobalt electroplating alloy and cobalt electroplating color is close to each other, but softer, more popular.Cobalt electroplating is not easy to roll plating, while tin-cobalt alloy electroplating can be applied to roll plating small parts.In addition, tin-cobalt alloy electroplating has excellent both plating ability and rolling ability, so it is suitable for complex shape workpiece.The corrosion resistance of nickel on the bottom layer is no less than that of chromium.To prevent discoloration, chromate impregnation is used to improve corrosion resistance.
It has a light rose-tinted appearance that feels very good and has excellent corrosion resistance.A good surface can be obtained by applying tin-nickel alloy plating to a glossy substrate or a bright nickel plating.If a dull surface (pear grain) is electroplated, the original condition of the surface can appear.The plating capacity is very good, almost no leveling effect, so it is suitable for very thin lines and rotating products.
2, aluminum alloy CNC processing electroplating copper - tin alloy
The color of the low tin bronze coating of aluminum alloy shell is pink or gold, fine crystal, it has a high corrosion resistance and good spinning performance, often as a protective - decorative nickel bottom, used in light industry, handicrafts, machinery and instrument industry and other industries.The copper coating is golden in color and has good corrosion resistance.Mainly used for decorative chrome plated bottom.The hardness and stability of aluminum alloy in air are higher than that of low tin bronze coating.However, due to the high tin content of the coating, as a protection of decorative coating in the bottom layer of the chromium is easy to flower, which is the weakness of tin bronze coating.High tin bronze coating with beautiful silver-white luster and good spinning properties, high hardness and wear resistance, used in industrial design to replace silver or chromium as reflective equipment, instruments, daily goods and other protective - decorative surface coating.