Anodizing is a method of metal surface treatment. As an anode metal material, forming a thin film on its surface by an applied current in a specific electrolyte is a material protection technology. Most metal materials (such as stainless steel, zinc alloys, aluminum alloys, magnesium alloys, copper alloys, titanium alloys) can be anodized in a suitable electrolyte. Through anodizing treatment, the metal material has the functions of beauty, corrosion resistance, wear resistance, insulation, etc. to meet different design requirements.
At present, the most widely used is the anodization of aluminum materials. Because of its fine structure, good adsorption and not easy to fall off, it is coated by anodizing method to prevent its continuous oxidation. There are many kinds of anodizing processes for aluminum materials, including ordinary anodizing, hard anodizing, and ultra-low temperature hard anodizing. In particular, hard anodizing is widely used in the surface treatment of hard wear-resistant and corrosion-resistant aluminum alloy parts such as pistons, cylinders, cylinder liners, hydraulic presses and turbines, steam valves, gears, gun parts, clutches, and brake discs.
Electroplating is one of the methods of surface treatment of metals and non-metals. As long as they are properly pretreated, various metal substrates and some non-metallic materials can be plated (for example, general blades can be plated as long as they are properly pretreated). Unlike anodizing, electroplating uses the material being plated as the cathode, the same metal material as the metal being plated as the anode (insoluble anodes are also used), and the electrolyte is a solution containing the ions of the metal being plated.
After a certain current is input between the anode and the cathode, due to the charge effect, the metal anode ions move to the cathode and deposit in the cathode when electrons are obtained. on plated materials.