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What are the surface treatments of metal stamping parts?

2022-05-10

Metal stamping products can be seen everywhere in our lives, and these products have been surface-treated when we see them, which is a process of forming a coating on the surface of the workpiece by a certain method. This gives the product the effects of rust resistance, oxidation resistance, corrosion resistance, more aesthetics and improved performance of the product. So what are the surface treatment methods for metal stamping parts? Dongguan Fortuna will introduce to you below.

1. Electroplating

The plated metal or other insoluble material is used as the anode, the workpiece to be plated is used as the cathode, and the cations of the plated metal are reduced on the surface of the workpiece to be plated to form a plated layer. In order to eliminate the interference of other cations and make the coating uniform and firm, a solution containing metal cations in the coating should be used as the electroplating solution to keep the concentration of the metal cations in the coating unchanged. The purpose of electroplating is to coat a metal coating on the substrate and change the surface properties or dimensions of the substrate. Electroplating can enhance the corrosion resistance of metals (the plated metals are mostly corrosion-resistant metals), increase hardness, prevent wear, improve electrical conductivity, lubricity, heat resistance and surface beauty.


2. Electrophoresis

Electrophoresis is an electrophoretic coating on the cathode and anode. When a voltage is applied, the charged paint ions move to the cathode, and form insoluble matter with the alkaline effect generated on the surface of the cathode, which is deposited on the working surface. Features of electrophoretic surface treatment process: The electrophoretic paint film has the advantages of fullness, uniformity, smoothness and smoothness. The hardness, adhesion, corrosion resistance, impact performance and penetration performance of the electrophoretic paint film are obviously superior to other coating processes.


3. Blackening

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 and improve the rust resistance of steel parts. There are two commonly used methods for blackening treatment: the traditional alkaline heating blackening and the late-appearing normal temperature blackening.


4, galvanized, tin

Zinc plating and tin refer to the surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials to play the role of beauty and rust prevention. Now the main method is hot-dip galvanizing.


5. Phosphating

Phosphating is a process of chemical and electrochemical reaction to form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The main purpose of phosphating is: to provide protection for the base metal and to prevent the metal from being corroded to a certain extent; to be used as a primer before painting to provide the adhesion and anti-corrosion ability of the paint film; to reduce friction in the metal cold working process Lubrication use.


6. Spraying

The paint or powder is attached to the surface of the workpiece by pressure or electrostatic force, so that the workpiece has the effect of anti-corrosion and appearance decoration.


7. Baking paint

 Put primer and topcoat on the substrate, and send it to a dust-free constant temperature baking room for baking every time it is painted.


8. Passivation

The mechanism of its passivation can be explained by the film theory, that is, it is believed that the passivation is due to the interaction between the metal and the oxidizing properties. passivation film. This layer of film exists as an independent phase, usually a compound of oxidized metal. It plays the role of completely separating the metal from the corrosive medium, preventing the metal from contacting the corrosive medium, so that the metal basically stops dissolving and forms a passivation state to achieve anti-corrosion. effect.


Dongguan Fortuna is a manufacturer of precision metal stamping and metal insert injection molding, dedicated to providing one-stop solutions for precision metal stamping, metal drawing and metal insert injection molding to customers from all walks of life around the world. We will provide you with consulting services and customize R&D according to your needs, and look forward to further cooperation with you.

metal surface treatments

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