Commonly used anti-corrosion technology for fasteners

Fasteners are the most common parts of mechanical equipment used for fastening connections. They are used in specific environments, and the long-term interaction of fasteners with the environment will always cause its state and performance to occur. Change, that is, corrosion, which is one of the main forms of fastener failure." The corrosion of fasteners will affect the detachment and repeated installation of the thread in a light degree, and will damage the strength of the connection between the components and even lead to the failure of the workpiece. Sudden failure results in catastrophic accidents, so the corrosion resistance of fasteners has always been a topic of great concern to everyone.

Commonly used anti-corrosion technologies for fasteners

The commonly used anti-corrosion technology for fasteners The anti-corrosion treatment of fasteners generally forms a coating or anti-corrosion layer on the surface of the workpiece by a certain method to hinder the influence of the external environment on the fastener itself and achieve the effect of corrosion resistance. There are four main anti-corrosion technologies for fasteners: film treatment technology, metal coating technology, coating technology and changing the internal structure of metal (such as stainless steel).
1. Film processing technology

The film treatment technology mainly refers to the treatment process of forming a stable chemical (electrochemical) conversion film on the metal surface by chemical or electrochemical methods. For example, in the urban rail vehicle, the film treatment of its fasteners is more black/blue treatment and phosphating treatment.
2. Metal coating technology

Metal coating technology is mainly a surface treatment process that uses coating technology to form a thin metal layer on the surface of metal materials to give decorative or protective properties to metal materials. In urban rail vehicles, the metal coating technology of fasteners is mainly galvanized, and other special metal coatings (chrome, nickel, cadmium, silver, etc.).
3. Coating technology

Coating technology refers to applying a specific coating to the surface of an object with certain equipment and methods to form a dense, continuous and uniform film on the surface, which is then dried and cured by natural or artificial methods to form protective or decorative properties. A surface treatment technique for active coatings.
4. Change the structure of steel