First, how to prevent stainless steel self-tapping screws rust Stainless steel self-tapping screws rust is a common problem, but users can take some measures to reduce this situation. First of all, users can pay attention to the plating process. Choosing a plating color with a longer salt spray test time is a good choice. When electroplating self-tapping screws, ensure that the moisture is completely dry, and the electroplating layer is too thin, which will lead to decreased corrosion resistance and easy to cause rust. In addition, it can be sprayed with imitation rust paint to further improve its anti-rust ability. Second, pay attention to the storage and use environment. Do not put stainless steel self-tapping screws directly on the ground, should be placed on the tray or shelf. Storage environment should not be humid, should be ventilated, breathable, reduce the existence of water vapor. Long-term storage or use of self-tapping screws in an environment under salinity, acidity, alkalinity, high temperature and humidity will inevitably lead to rust, so it should be regularly checked and replaced.
Second, how to carry out the surface treatment of self-tapping screws The surface treatment of self-tapping screws is an important process. There are several common surface treatment methods: 1, electroplating. In this method, the self-tapping screw to be electroplated is soaked as a cathode into a solution containing the metal cation to be electroplated. Metal is electrically attached to the surface of the self-tapping screw. Commonly used electroplating metals are nickel, chromium, tin, copper, gold and silver. 2. Anodizing. This method uses chemical or electrochemical treatment to form a layer of skin containing the metal component on the surface of the metal. Almost all metal materials can be anodized in a suitable electrolyte, including stainless steel, zinc alloy, aluminum alloy, copper alloy and titanium alloy. 3. Blackening. Generally, alkaline chemical oxidation method is used, because of the characteristics of the appearance of the oxide film, it can only be used in general or oily media, or to take into account the impact of the appearance, blackening screws will be used. 4. Passivation. This method dissolves the iron contaminants on the screw surface, forming a passivated protective film, which can protect the screw and make it not easily corroded. General passivation surface treatment methods are applied to electronic products. 5. Electrophoresis. This method uses electrophoresis to evenly cover the paint, rubber and other particles on the surface of the screw fastener. After the surface treatment of electrophoresis, the surface coating of the self-tapping screw should be uniform, smooth and smooth. 6, Dacromet surface treatment. This surface treatment can be plated in three colors, black, silver gray, silver white. The advantage of Dacromet surface treatment is its good rust resistance, suitable for carbon steel and stainless steel.
It should be noted that there are many ways to finish the surface. Stainless steel self-tapping screws should be selected according to the specific use of the environment or other requirements of the surface treatment. Users can choose their own surface treatment based on understanding the nature of self-tapping screws and the use environment. In this way, the appearance and quality of the screws can be guaranteed, and their service life can be extended.
