Hardware knowledge: stainless steel screw anti-corrosion method

Hardware knowledge: stainless steel screw anti-corrosion method

Stainless steel screws are made of metal, and the metal corrosion protection methods are mainly in four aspects, namely the material itself, the environment used, the interface between the data and the environment, and the design of the improved metal structure. If a complete anti-corrosion alloy is used to make the stainless steel "target" =_blank>Stainless steel screws, unless there is special demand, it is not realistic in terms of economics, or completely separate the appearance of the screw from the environmental elements that will cause corrosion, and it may not be feasible in practice. It may be very difficult. Improved metal construction design can improve the impact of special conditions under certain conditions, but most stainless steel "target=_blank> stainless steel screws can not be fully modified, and its maintenance is not permanent, so this method can not be basically processed The problem is that as long as the anti-corrosion on the interface, that is, the appearance of anti-corrosion treatment is currently the most widely used method. 

Stainless steel "target=_blank> stainless steel screw appearance anti-corrosion treatment refers to the use of various methods to apply a maintenance layer on the metal surface, its role is to isolate the metal from the corrosive environment to inhibit the corrosion process, or reduce corrosive media and The metal is in contact with the surface to achieve the purpose of avoiding or mitigating corrosion. 

The maintenance layer should be able to meet the following requirements: 

1, corrosion resistance, wear resistance, high hardness, 

2. The structure is strict, intact, and the pores are small. 

3. It is separated from the base metal and has good adhesion. 

4, the average spread and a certain thickness. 

The maintenance layer is usually divided into two types: metal coating and non-metal coating. The metal coating refers to the use of a highly corrosion-resistant metal or alloy to form a maintenance layer on the surface of a metal that is easily corroded. This coating is also called a coating. There are quite a number of methods and varieties for producing metal plating, the most common of which is electroplating, followed by molten metal immersion plating (hot dip plating) and chemical surface treatment. Non-metallic coating refers to the use of organic polymer materials such as paint, and inorganic materials such as ceramics to form a maintenance layer on the surface of metal equipment or parts. The maintenance layer can completely separate the base metal from the environmental medium to avoid contact corrosion of the base metal. Corrosion is formed in stainless steel "target=_blank> stainless steel standard parts media.