Surface Treatment for Metal products
1.What is surface treatment?
Surface treatment is an additional process applied to the surface of a material for the purpose of adding functions such as rust and wear resistance or improving the decorative properties to enhance its appearance.
Painting, such as that applied to the body of an automobile, printing of the manufacturer's name and other information on the surface of home appliances, and "plating" applied under the paint on guardrails, are typical examples of surface treatment.
Heat treatment, such as quenching, applied to metal parts such as gears and blades, is also classified as surface treatment.
Surface treatments can be broadly classified into removal processes, such as scraping or melting the surface, and additive processes, such as painting, which add something else to the surface.
2.Methods of surface treatment
The most commonly used surface treatments include the following methods. Surface treatments that use electricity and require a dedicated power supply are indicated in red letters in the table.
| Category | Process | Explanation |
| Cleaning | Cleaning | Cleaning is a process to remove oil, surface oxides, burrs and foreign substances. It can prolong the life of painting and plating. Among the cleaning processes, blasting and honing use abrasives and grinding wheels, respectively, so these processes can be said to be both cleaning and polishing. |
| Blasting | ||
| Honing | ||
| Polishing | Chemical polishing | Polishing the surface to make it smooth. While polishing is generally associated with rubbing with a grinding stone or brush, chemical or electropolishing slightly dissolves the surface to make it smooth. Electropolishing uses electrolysis to dissolve the surface of the part in a solution. |
| Mechanical Polishing | ||
| electropolishing | ||
| Painting | Spaying painting | This is the process of adding paint to a surface. This is done to improve corrosion resistance and decorative properties. Electrostatic coating is a type of coating in which the paint is charged and adheres efficiently with the force of static electricity. Powder coating is also a type of electrostatic coating. Electrodeposition coating is a method of depositing paint on the surface of a part by electrolysis of a solution of special paint and is used for the base of automobile bodies |
| Electrostatic coating | ||
| Electrodeposition plating | ||
| Plating | Electroplating | Plating is the process of covering the surface of a component with a thin film of another metal. Electroplating is a method of depositing a coating on the surface of a part by electrolyzing a solution. This is mainly done on metals such as iron to provide corrosion resistance and decorative properties. In some cases, plating is applied to the surface of plastics for decorative purposes, but the number of such applications has been decreasing in recent years due to improvements in coating technology. |
| Chimical plating | ||
| Hot dip coating | ||
| Heat treatment | Surface Quenching | This is a treatment that hardens the surface of metals to improve their resistance to wear and fatigue. By heating and cooling the metal, the structure of the metal surface is changed, making it harder. In surface quenching, there is a method called high-frequency quenching, in which a high-frequency current is applied to a coil, heating the part in the manner of a so-called induction heater. |
| Charcoal burning | ||
| Nitriding treatment |
3. Sayhey's products with surface treatment
