How to Make Stamped Parts And Screws Corrosion-Resistant

 Stamped metal parts and screws are widely used in numerous fields, but the problem of corrosion has long plagued the industry. Corrosion not only affects the appearance of products but also reduces their mechanical properties and service life. So, how can we improve the corrosion resistance of stamped metal parts and screws? The following methods are worth trying.

1.    Coating Protection 

    Coating is a common method to improve the corrosion resistance of stamped metal parts and screws. One such coating is asphalt paint. Preheating the stamped parts before painting enhances the adhesion of the asphalt paint and accelerates drying. Epoxy coal tar pitch coating, as a two-component coating, has high adhesion and a smooth surface, effectively blocking the erosion of corrosive media. Although epoxy ceramic lining has a complex manufacturing process and high cost, it offers excellent adhesion and smoothness, making it an excellent anti-corrosion coating. Polyurethane coating is a new type of green special coating developed to meet environmental protection requirements, providing good wear resistance and corrosion resistance. Additionally, cement mortar lining with special coatings, aluminate cement coatings, or sulfate cement coatings can also enhance the corrosion resistance of stamped parts.

2.    Passivation Treatment 

    Passivation treatment converts the metal surface into a state that is not easily oxidized, slowing down the corrosion rate. Compared with traditional physical sealing methods, passivation does not increase the thickness of the workpiece or change its color, improving product precision and added value, and is relatively easy to operate. The passivation process occurs in a non-reactive state; the passivating agent can be repeatedly added and used, offering a long service life and economic cost. Moreover, passivation promotes the formation of an oxygen molecular structure passivation film on the metal surface. This film is dense and stable, with self-repairing properties in the air, making it more stable and advantageous than traditional anti-rust oil coating methods.

3.    Adding Corrosion-Resistant Materials 

    During the manufacturing of metal parts, adding corrosion-resistant materials that do not easily react with the surrounding medium can significantly improve the corrosion resistance of stamped metal parts. For example, metals like chromium, nickel, and titanium are not easily oxidized in the air and can form dense oxide films that resist corrosion from acids, alkalis, salts, etc. Adding these metals to iron or copper can produce metal products with excellent corrosion resistance. Using metal powder metallurgy technology, flexible ratios of various metal elements can be achieved. By adding metal powders with different properties, metal parts with excellent corrosion resistance can also be obtained.

4.    Electroplating Technology 

    Electroplating technology involves immersing metal in an electrolyte and using electric current to form a protective metal coating on its surface. This not only enhances the corrosion resistance of the metal but also extends its service life. Common electroplating metals include zinc, tin, aluminum, nickel, and chromium. They can form a dense protective film on the surface of stamped metal parts, preventing contact between corrosive substances and the metal.

  Summary 

Improving the corrosion resistance of stamped metal parts and screws requires the comprehensive application of multiple methods. Enterprises should select appropriate anti-corrosion measures based on the product's operating environment and requirements to ensure product quality and performance and extend their service life.