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How to take anti-corrosion measures in the processing of metal stamping parts

by:Fortuna     2021-03-05
The application of metal stamping parts in our daily life is becoming more and more common, but the requirements for metal stamping parts are getting higher and higher. The anti-corrosion characteristics of metal stamping parts is one of them. Only when the anti-corrosion characteristics are met, the service life of the stamping parts can be longer. At present, although the service life of metal stamping parts is implemented in accordance with industry standards, most of them can reach the service life of more than 15,000 times and the neutral salt spray test inspection standard of 96 hours. In theory, they should have a service life of more than ten years. . However, as an accessory of doors and windows, hardware accessories have a certain decorative effect besides the performance of mechanical use. Just as users of discolored and rough profiles are unacceptable, rough, rusted, and discolored hardware are unwelcome. . It is imperative to improve the corrosion resistance of metal stamping parts. The most widely used materials in metal stamping parts are carbon steel, such as transmission locks, lining steel, etc. For carbon steel, how to improve corrosion resistance is the key to affecting its service life. Due to frequent exposure to rain and sunlight, the surface in contact with the profile has been severely rusted after being used for less than three years in Shanghai. According to relevant information, the surface of the PVC profile will free HCL under the action of light and heat during the aging process. The galvanized layer has a strong corrosive effect, which can explain why the corrosion occurs on the surface in contact with the PVC profile; according to the relevant British standards, the use of the galvanized layer under harsh conditions requires 96 hours in addition to the neutral salt spray test. It is also required that the thickness of the galvanized layer is not less than 40μm. The current domestic standards often only consider the salt spray test time without considering the thickness of the coating. If the passivation film is intact, the coating of about 10μm can pass the 96-hour neutral salt spray test. Once the passivation film is damaged, it is easy to produce rust. The domestic electroplating industry generally believes that the 96-hour salt spray test is only a test of the protective performance of the galvanized passivation film. In addition, the thickness of the galvanized layer is divided into three levels according to the use environment: good environment, general environment, and harsh environment. The thickness of zinc plating is 61μm, 121μm and 24μm, respectively. Therefore, metal stamping parts also need to be treated with anti-corrosion during the production process, which can effectively avoid corrosion during use. The main methods are as follows: 1. Asphalt paint coating, and the stamping parts before painting Preheating can improve the adhesion of asphalt paint and accelerate drying. 2. The cement mortar lining with special coating can improve the corrosion resistance of the lining of the stamping parts. 3. The epoxy coal tar pitch coating for hardware stamping parts is a two-component coating, which has high adhesion and a very smooth surface. 4. Epoxy ceramic lining has certain limitations in use due to the difficult manufacturing process and high cost. It has high adhesion and smoothness, and is an excellent anti-corrosion coating for stamping parts. 5. Aluminate cement coating or sulfate cement coating, both of these special cement coatings are suitable for the internal anti-corrosion of stamping parts and improve the ability to resist corrosion.  6. Polyurethane coating is a new type of green special coating developed to meet the needs of environmental protection. It has good wear resistance and corrosion resistance. Recommended article: Problems that must be paid attention to when handling metal stamping parts. Previous: Do you know the difference between thin and thick plates in the processing of stamping parts?
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