What are the surface treatments of metal stamping parts?
Metal stamping products can be seen everywhere in our lives, and these products have been surface treated when we see them, and they are the process of forming a covering layer on the surface of the workpiece through a certain method. This gives the product the effects of anti-rust, anti-oxidation, anti-corrosion, more beautiful appearance and improving the performance of the product. So what are the surface treatment methods for metal stamping parts, the following is an introduction to you. 1. Electroplating The plating metal or other insoluble materials serves as the anode, the workpiece to be plated serves as the cathode, and the cations of the plating metal are reduced to form a plating layer on the surface of the workpiece to be plated. In order to eliminate the interference of other cations and make the coating uniform and firm, it is necessary to use a solution containing the coating metal cations as the electroplating solution to keep the concentration of the coating metal cations unchanged. The purpose of electroplating is to plate a metal coating on the substrate to change the surface properties or size of the substrate. Electroplating can enhance the corrosion resistance of metals (corrosion-resistant metals are mostly used for coating metals), increase hardness, prevent abrasion, improve conductivity, lubricity, heat resistance and surface aesthetics. 2. Electrophoresis Electrophoresis is the electrophoretic coating in the anode and cathode. When voltage is applied, the charged paint ions move to the cathode, and form insoluble matter with the alkali generated on the surface of the cathode to deposit on the working surface. Characteristics of electrophoretic surface treatment process: electrophoretic paint film has the advantages of fullness, uniformity, flatness and smoothness. The hardness, adhesion, corrosion resistance, impact performance, and permeability of electrophoretic paint film are significantly better than 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 anti-rust ability of steel parts. There are two commonly used methods for blackening treatment: the traditional alkaline heating blackening and the late normal temperature blackening. 4. Zinc plating and tin plating Zinc plating and tin plating refer to surface treatment technologies that coat a layer of zinc on the surface of metals, alloys or other materials for aesthetics and rust prevention. The main method currently used is hot-dip galvanizing. 5. Phosphating Phosphating is a process of forming a phosphate chemical conversion film by chemical and electrochemical reactions. The phosphate conversion film formed is called a phosphate film. The main purpose of phosphating is: to provide protection to the base metal, to prevent metal from being corroded to a certain extent; for 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 uses pressure or electrostatic force to attach paint or powder to the surface of the workpiece, so that the workpiece has the effect of anti-corrosion and appearance decoration. 7. Baking paint Put primer and top coat on the base material. Each time the paint is applied, it will be sent to a dust-free oven at a constant temperature for baking. 8. Passivation The mechanism of passivation can be explained by film theory, that is, it is believed that passivation is due to the effect of metal and oxidation properties. When it acts, it produces a very thin, dense, good covering performance, and firm adsorption on the metal surface. Passivation film on metal surface. This layer of film exists as a separate 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 forming a passivated state to achieve anti-corrosion effect. Precision is a precision metal stamping and metal insert injection molding manufacturer, committed to providing customers from all walks of life around the world with one-stop solutions for precision metal stamping, metal drawing and metal insert injection molding. We will provide you with consulting services and conduct customized research and development according to your needs, and look forward to further cooperation with you. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies