Why need to make the Finish for Metal Part
Normal metal materials of iron,Aluminum,copper have active chemical properties,If they are exposed to the air for a long time, their surfaces will be oxidized or even corroded, seriously affecting the performance of materials. Therefore, in order to make these metal materials more durable and beautiful, their surfaces are usually treated to extend their service life and increase their aesthetics
There some noraml finish way for the metal:
Spray Paint:Spray painting is a painting technique in which a device sprays coating material through the air onto a surface. The most common types employ compressed gas—usually air—to atomize and direct the paint particles.
Electroplating：Electroplating is a surface processing method to deposit the cations of pre plated metal on the surface of the base metal by electrolysis in a salt solution containing pre plated metal with the substrate metal as the cathode. The coating performance is different from that of the base metal and has new characteristics. According to the function of the coating, it can be divided into protective coating, decorative coating and other functional coatings.
Electrophoresis：Electrophoresis refers to the process in which the charged coating ions move to the cathode under the action of voltage applied at the cathode and anode, and react with the alkalinity generated on the cathode surface to form insoluble matters, which are deposited on the workpiece surface.
Galvanization:Galvanizing refers to the surface treatment technology of plating a layer of zinc on the surface of metal, alloy or other materials for aesthetic, rust prevention, etc
Blacken:The surface blackening treatment of steel parts is also called bluing. The principle is to rapidly oxidize the surface of steel products to form a dense oxide film protective layer, so as to improve the anti rust ability of steel products.
Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as magnesium and titanium, also can be anodized.
The anodic oxide structure originates from the aluminum substrate and is composed entirely of aluminum oxide. This aluminum oxide is not applied to the surface like paint or plating, but is fully integrated with the underlying aluminum substrate, so it cannot chip or peel. It has a highly ordered, porous structure that allows for secondary processes such as coloring and sealing.
Anodizing is accomplished by immersing the aluminum into an acid electrolyte bath and passing an electric current through the medium. A cathode is mounted to the inside of the anodizing tank; the aluminum acts as an anode, so that oxygen ions are released from the electrolyte to combine with the aluminum atoms at the surface of the part being anodized. Anodizing is, therefore, a matter of highly controlled oxidation the enhancement of a naturally occurring phenomenon.
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