Sheet metal materials and surface treatment process.ppt

Lead you to know the commonly used sheet metal materials, commonly used sheet metal materials exist in the following kinds, one for the cold rolled sheet, its grade is SPCC, it belongs to the most basic for sheet metal materials, extremely wide range of uses, it is used as a substrate for other materials, relatively easy to rust, and the second is thegalvaniseZinc plate, its brand name is SECC, widely used is with the help of cold plate as a substrate through electroplating and get, this is the result of chemical reaction, the third is hot galvanised plate, its brand name is SGCC, widely used, is the cold plate as a substrate placed in the molten zinc solution heated so as to form a zinc layer of the product after the production process belongs to the process of physical change. 4. SPHC, this kind of low-end materials, easy to rust, its thickness is thicker, generally more than 3mm, usually used to make hinges products. There is also SD steel plate, which is a kind of plate with excellent anti-rust and anti-corrosion properties, and the mounting bracket of the air conditioner outdoor unit will use this material. In addition, stainless steel and stainless iron, there are typical grades, belongs to the alloy material, its anti-rust and anti-corrosion performance is good, the surface is more beautiful, usually used to make the appearance of the parts, such as refrigerator door shells and gas cooker stove stove surface. 7. surface plated with aluminium and zinc plate, it seems to belong to the category of electrolytic galvanized plate, but it is galvanized by electrolysis than the plate has a more metal-like aluminium elements However, it has more metallic aluminium than electrolytically galvanised sheet, so its surface is relatively smooth, clean and beautiful, and it is often used to make parts for display purposes, such as the steel plate used for the back of a certain type of refrigerator. Aluminium or aluminium alloy sheets can also be called aluminium sheets. These aluminium or aluminium alloy sheets have a low density and are resistant to corrosion, and are typically used for parts such as the tray that holds water in a refrigerator and the fins of an evaporator. Take you to know the price comparison of sheet metal materials, in the case of the same thickness, hot rolled sheet, cold rolled sheet, hot zinc plate, electric zinc plate, SD steel plate, stainless steel, stainless steel to compare the price of the same material; the same material, the greater the thickness of the lower the price; sheet metal cost, the cost of materials basically occupy the 60% to 70%, and sometimes even higher; so the design of a reasonable structure is necessary to improve the material utilisation is also necessary to improve the cost of materials is also necessary. Improving the material utilisation rate is also necessary; if the material utilisation rate is low, the product price may be lower than the scrap price; Haier Group elaborated on the purpose of surface treatment of steel sheet in 2009, because some sheet metal materials do not have the ability to prevent rust and corrosion, so they have to be surface treated to achieve the purpose. The purpose of surface treatment is mainly divided into two categories: one is to improve the service life of the product in harsh environments, which refers to the ability to prevent rust and corrosion; and the other is to obtain the desired surface effect or function, which refers to meeting the appearance requirements of the product. 1.0 steel plate is usually used in the surface treatment process, one of which is plating, in which charged ions in the plating solution attach to the surface of the product under the action of an electric field, thus forming a plating layer. Electroplating, in the electroplating solution, the charged ions under the action of electric field attached to the surface of the product, and then form plating layer, which belongs to the chemical change; Second, powder spraying, powder is polarised, under the action of electric field force, uniformly attached to the surface of the product of the opposite polarity, which belongs to the physical change.3. Electrophoresis, is the electrophoretic coating in the cathodic and anodic role of the two electrodes, the charged paint ions towards the surface of the product to move, and then deposition of the coating to build up, which belongs to the chemical change. Immersion moulding, is the product is in the molten material, the implementation of heating, the heated metal and the surrounding molten material combination, so as to form a certain thickness of the surface material, which belongs to the physical changes. Other surface treatment methods such as paint, enamel, etc., for home appliances are not commonly used, if you are interested in their own to learn. That has a variety of types of surface treatment process called electroplating, electroplating types, galvanising, which can be divided into cyanide galvanising, zincate galvanising, chloride galvanising, sulphate galvanising, zinc electroplating industry belongs to the kind of industry that will cause pollution, although it is applied to a wide range of low cost, however, zinc plating preparation products do not comply with the ROHS standard, so in the development of the product design time to be As far as possible not to choose electroplated products, surface treatment process of electroplating two is chromium plating, the principle of the process is the same as zinc plating, and the traditional zinc plating comparison, chromium coating has a very strong corrosion resistance, galvanised corrosion resistance of 710 times, and its surface is also very beautiful, but the cost is relatively high. The most advanced chromium plating process at this stage is called, in Chinese, Dacorol, which is a revolutionary high-tech metal surface treatment technology, and the whole process is pollution-free. Surface treatment process includes many types, such as electroplating, electroplating and copper plating, nickel plating and other specific ways, you want to plating any metal, can be achieved with the help of electroplating process. There is also powder coating process, powder coating process is the principle of electrostatic powder coating, mainly through the electrode so that the paint powder polarisation, and then let the object to be sprayed with the opposite charge, under the action of the electric field force powder can be uniformly attached to the surface of the object. Powder coating process has some of these characteristics, powder electrostatic spraying will not cause the atmosphere to suffer from pollution, powder can be recycled to reduce the cost of material consumption, film performance is excellent, acid resistance, alkali resistance and salt corrosion resistance is good, adhesion is also high. Surface treatment process of electrophoresis, the principle of the process is that the electrophoretic paint in the cathode and anode, under the action of the applied voltage, with the charge of the paint ions move to the cathode, and with the cathodic surface of the alkaline effect of the formation of insoluble substances, deposited on the surface of the workpiece. The characteristics of electrophoresis as a surface treatment process are that the electrophoretic paint film has the advantages of full coating, the electrophoretic paint film has the advantages of uniformity, the electrophoretic paint film has the advantages of flatness, the electrophoretic paint film has the advantages of smoothness, the hardness of the electrophoretic paint film is obviously better than other coating processes, the adhesion of the electrophoretic paint film is obviously better than other coating processes, the corrosion resistance of the electrophoretic paint film is obviously better than other coating processes, and the impact property is better than that of the other coating processes. The impact performance of electrophoretic paint film is obviously better than other coating processes, and the permeability performance of electrophoretic paint film is obviously better than other coating processes. The common electrophoretic colour of the electrophoretic paint film is black, and other colours also exist. One of the surface treatment process is dip moulding, the process principle of dip moulding is that metal dip moulding is a new type of technical treatment process for metal surface anticorrosion, dip moulding is a heating process including metal preheating, dip moulding is a heating process including dipping material, dip moulding is a heating process including curing. In this stage of dipping, the heated metal will stick to the surrounding material, the higher the heat of the metal, the longer it takes to dip the material, which will lead to a thicker thickness of the material to be stuck. Dip moulding has such process characteristics: its application is extremely diverse and extensive, it covers a rich colour characteristics, has very good protective performance characteristics, has excellent cold insulation performance, but also has the characteristics of acid and alkali resistance.