Plastic Injection Mold, Injection Mold Maker, Mold Parts, JinHong Plastic Mold Factory

　　In recent years, some plastic compression springs manufacturers use room temperature oxidizers, which overcome the shortcomings of traditional processes and save a lot of energy. The oxidant is a blue-green uniform and clear solution, not flammable and odorless. The working fluid is composed of a stock solution and tap water. The commonly used dilution ratio of plastic compression springs blackening is 1:5-1:7.

　　The oxidation treatment device is relatively simple. When a small number of workpieces are black, plastic buckets can be used; when a large number of workpieces are black, glass fiber or plastic tanks can be used. The drums and hanging baskets used for hoisting work should also be made of plastic. Polypropylene plastic. The upper sealant groove can be made of steel plate. The process of blackening treatment of oxidant is roughly divided into three parts: pretreatment, blackening treatment, and sealing treatment (post-treatment). The method of pretreatment is the same as that of conventional oxidation treatment, but the quality of pretreatment is the key to ensuring the quality of blackening at room temperature. It must be thoroughly degreasing, rusting, and cleaning.

　　The oxidation time at room temperature is 2-5 minutes. The workpiece is immersed in the prepared working fluid, and an autocatalytic continuous deposition reaction is carried out on the surface of the workpiece. The ferrous metal components in the solution are reduced and deposited on the surface. To enable continuous use of the tank liquid, the oxidation liquid should also be continuously circulated and filtered to remove the insoluble by-products produced during the oxidation process. During the oxidation process, pay attention to constantly replenishing fresh stock solution, and the amount of each replenishment is about 1/4-1/3 of the initial input. The sealing process is to immerse the workpiece that has been blackened and fully cleaned with cold water into the dehydration anti-rust oil for 1rain. When immersing, shake the workpiece to make the dehydration sufficient and the oil immersion uniform. The dehydrated anti-rust oil can remove the water film on the metal surface and attach a layer of anti-rust oil film to the surface to protect the metal from corrosion. In addition to the above-mentioned sealing treatment, it can also be used for rust prevention between processes.

　　The surface of the workpiece after normal temperature oxidation treatment can produce a black powdery film that can be wiped off, which does not affect the oxidation quality. Generally, in addition to the inspection requirements, this powder film is not required to be wiped off. The fastness and compactness of the inner blackening film also increase with storage time. After the workpiece becomes black, it is washed and sealed. Do not wipe it with your hands within 3-4 days.

　　The quality inspection of the oxide film is roughly the same as the conventional method. The anti-corrosion performance comparison between the two requires an objective evaluation after continuous practice.