Classification of chemical properties of metal materials used in metal stamping parts

The metal stamping parts used in some more demanding occasions often put forward requirements on the chemical properties of the raw materials used in the production of metal stamping parts. Some metal stamping factories with no relevant experience may seem at a loss when they first come into contact with them. Today, stamping will popularize the chemical properties of the metal materials used in the following metal stamping parts. The chemical properties of metal materials refer to the performance that can only be achieved when a chemical reaction occurs, including oxidation resistance, corrosion resistance and chemical stability. One, chemical properties. The chemical properties of metal materials refer to the ability of metal materials to resist chemical attack by various corrosive media at room temperature or high temperature. It mainly includes two aspects: corrosion resistance and oxidation resistance. Second, chemical corrosion. It is the result of the direct chemical action between the metal and the surrounding medium. It includes two forms: gas corrosion and metal corrosion in non-electrolytic chemical corrosive substances. ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? Its characteristics are: the corrosion process does not produce current, and the corrosion products are deposited on the metal surface. Third, electrochemical corrosion corrosion. The corrosion caused by the action of metal and electrolyte solutions such as acid, alkali, salt, etc., is called electrochemical corrosion. It is characterized by current generation during the corrosion process. The corrosion product (rust) does not cover the surface of the anode metal, but at a certain distance from the anode metal. Fourth, general corrosion. This kind of corrosion is evenly distributed on the inner and outer surfaces of the metal, so that the cross-section is continuously reduced, and finally the force-bearing parts are destroyed. Five, intergranular corrosion. This kind of corrosion takes place inside the metal along the edge of the crystal grains, and usually does not cause any changes in the shape of the metal, and often causes sudden damage to equipment or parts. Six, pitting corrosion. This kind of corrosion is concentrated in the small area of u200bu200bthe metal surface, and develops rapidly to the depths, and finally penetrates the metal, which is a kind of corrosion damage that is more harmful. Seven, stress corrosion. It refers to the damage caused by the metal in the corrosive medium under the action of static stress (the internal and external stress of the metal). This kind of corrosion generally penetrates the grains, the so-called transgranular corrosion. Eight, corrosion fatigue. Refers to the damage caused by metal in corrosive media under the action of alternating stress. It is also a kind of transgranular corrosion. Nine, antioxidant properties. The ability of metal materials to resist oxidation at room temperature or high temperature. The oxidation process of metals is actually a form of chemical corrosion. It can be directly used in a certain period of time, the size of the weight loss of the metal surface after corrosion, that is, it can be expressed by the rate of metal weight loss. Previous: Try this method to effectively reduce the cost of metal stamping dies