Views: 45 Author: Site Editor Publish Time: 2018-06-29 Origin: www.fuchun-casting.com
Metals are easy to corrode and rust in the natural state, thus increasing the loss of metals and reducing the service life. Therefore, in order to increase the wear resistance, corrosion resistance, aesthetics and other functions of metals, it is necessary to protect the metal surface.
Metal surface treatment is a kind of technology which uses modern physical chemistry, metallurgy and heat treatment to change the condition and properties of metal surface, and optimize the combination of metal surface and material to meet the predetermined performance requirements. It is called metal surface treatment.
Mould surface treatment technology is a systematic engineering to obtain the required surface properties by changing the shape, chemical composition, structure and stress state of the mold surface through surface coating, surface modification or composite treatment technology.
Metal surface treatment performance refers to: wear resistance, corrosion resistance, friction coefficient, fatigue performance. Commonly used processing types are galvanizing, tin plating, copper plating, nickel plating, chromium plating, blackening, phosphating, spraying, polishing.
Galvanization refers to the surface treatment technology of plating a layer of zinc on the surface of metals, alloys or other materials for aesthetic and rust-proof purposes.
Galvanization on iron and steel parts is mainly used to prevent corrosion, and it is the most productive of all kinds of electroplating. Galvanization is widely used in light industry, Electromechanical industry and national defense industry because of its low cost, good corrosion resistance, beautiful appearance and storage resistance.
Tin corrosion products are harmless to human beings and easy to braze. Tin plating is widely used in food canned packaging products, beverages, tableware and many parts of the electronic industry that need brazing.
Copper plating is often used as the intermediate layer of other coatings to improve the adhesion of surface coatings and matrix metals. In the electric power industry, thick copper wire plating can be used instead of pure copper wire to reduce copper consumption.
The application of nickel plating is very wide. It can be used to protect decorative and functional two aspects. The former is mainly used for protective decorative coating of bicycles, clocks and watches, household appliances, hardware products, automobiles, cameras and other parts.The latter is mainly used for repairing and electroplating of wearable products.
Chromium can keep luster in air for a long time, and does not react in alkali solution, nitric acid, sulfuric acid and many organic acids. Chromium plating has high hardness, excellent wear resistance and low friction coefficient. Therefore, chromium plating is often used to protect decorative coatings, prevent rust of base metal and beautify appearance, and also to improve wear resistance of products. Or repair wear;
The surface of the steel parts has been blackened, and it is also known as bluing. The principle is that the surface of steel products is oxidized rapidly to form a dense oxide film protective layer, which improves the anti-rust ability of steel parts.
Phosphate conversion film is a process of chemical and electrochemical reaction to form phosphate chemical conversion film.The main purposes of phosphating are as follows: to protect the base metal from corrosion to a certain extent; to primer before painting, to improve the adhesion and corrosion resistance of the coating; to reduce friction and lubrication in metal cold working process;
Paint or powder is coated on the surface of the workpiece by pressure or electrostatic force, so that the workpiece has anticorrosion and decorative effect.
Modification of workpiece surface with flexible polishing tools and abrasive particles or other polishing media. Polishing can not improve the dimensional or geometrical accuracy of the workpiece, but to obtain a smooth surface or mirror gloss for the purpose, and sometimes to eliminate gloss.
In the traditional metal surface treatment technology, electroplating is one of the most widely used treatment methods, but the use of electroplating on the environment is very serious pollution, so the country is gradually reducing the use of electroplating, in order to effectively replace the use of electroplating, a new generation of environmentally friendly special surface alloy catalytic solution, simple operation procedures, investment Low cost, in line with national environmental standards, metal surface treatment technology is particularly widely used.