In daily life, stainless steel screw is a common fastener, in the process of use, rust is a common phenomenon, but also let us worry about things, this will not only affect the aesthetic level, but also affect the performance of stainless steel screw. Therefore, we must pay attention to the key points in the process of using stainless steel screws!
Stainless steel screws in very humid conditions, every day the sun, wind and rain. After a long time, there will be some rust. For example, contact with some acid-base chemicals to produce chemical reactions. There is also a stainless steel screw used in seawater. SUS201 stainless steel screw is used in seawater with strong salinity. If it is soaked for a long time, the workpiece will be corroded and rusted.
1. The attachment of dust or dissimilar metal particles, in the humid air, the attachment and the condensation water of stainless steel screw connect them into a micro battery, causing electrochemical reaction, and the protective film is damaged, which is called electrochemical corrosion.
2. In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), when it meets with condensate water, it forms sulfuric acid, nitric acid and acetic acid, causing chemical corrosion.
3. Stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration wall of alkali water, lime water splash), causing local corrosion.
The solutions are as follows:
The first step: first use stainless steel cleaning agent to remove oil, rust and various substances on the surface. After three minutes of treatment, the workpiece is as bright as new. It can restore the original luster of the workpiece, does not damage the workpiece substrate, and has short rust resistance. It is safe and environmentally friendly, and does not volatilize, leaving no residue.
The second step: stainless steel passivation solution can be used for stainless steel screw rust prevention. The operation is simple. It only needs to use plastic tank at room temperature for 1 hour. After passivation, the size and appearance of the workpiece will not be changed. At the same time, a passivation film is formed on the surface to prevent the workpiece from rusting again. After passivation, the bright and clean surface of the workpiece can be obtained, and the service life of stainless steel screw can be extended.
