Are Stainless steel Screw Rust Proof?

No, Stainless steel screws are not rustproof. When brown rust spots appear on the surface of stainless steel bolts and nuts, many people will be surprised that “stainless steel will rust?” In fact, this is a one-sided and wrong view of the lack of a certain understanding of stainless steel. Stainless steel can also rust under certain conditions. will rust. Stainless steel has a chromium oxide film formed on its surface, which can prevent the infiltration and oxidation of oxygen atoms, so as to obtain the ability to resist rust. Once this protective film is continuously destroyed for some reason, the oxygen atoms in the air or liquid will continue to infiltrate or the iron atoms in the metal will continue to separate out, forming loose iron oxide, and the surface of the stainless steel will be continuously corroded.

What Makes Stainless Steel Screws Rust Proof?

Stainless steel screws will rust because they are in contact with acid and alkali chemicals, or if the stainless steel screws are in a humid environment for a long time, the protective film on the surface of the stainless steel screws will be damaged, and the stainless steel screws will continue to corrode, corrode and rust.
Of course, the damage to the stainless steel screw protective film is not only due to the above two reasons, but there are also many situations in daily life

1. The stainless steel screw has been in contact with organic juices such as noodle soup and vegetables for a long time, and chemical reactions will occur in the presence of water and oxygen. It forms organic acid and corrodes stainless steel screws.
2. Stainless steel screws encounter condensed water in polluted air. Pollution refers to the presence of a large amount of sulfide or carbon oxide. When encountering water, it will form sulfuric acid and hydroxide, which will chemically corrode stainless steel screws.

How to Prevent Stainless steel screw rust?

The above conditions are all rust caused by the destruction of the protective film of stainless steel screws. To prevent stainless steel screws from rusting, the following points should be done:
①The stainless steel screws near the sea should be made of 316 stainless steel, which can well resist seawater corrosion.
②The surface of stainless steel screws with decorative functions should be cleaned and scrubbed frequently so as not to affect the appearance.
③ Consumers should go to reputable manufacturers to choose stainless steel screws. The chemical composition of some stainless steel screws on the market does not meet national regulations and cannot meet the requirements of rust prevention.
Summary: Stainless steel screws will rust because the protective film of stainless steel is damaged, stainless steel is oxidized, and the ability to resist rust is weakened, so stainless steel screws will also rust. Therefore, in daily life, it is necessary to clean the surface of stainless steel screws to eliminate external factors that cause rust.

How to Choose the right Stainless steel Material?

Several stainless steel fasteners are suitable for the environment (conventional environment, marine environment, acid, and alkali environment)

304 material fasteners: It is no problem to use in an environment where there is no contact with liquids in general air

316 material fasteners: It is no problem to use in the environment of general contact with water, ordinary seawater, and sewage

316L material fasteners: It is no problem to use in the sewage environment with a certain acidity and the marine environment

2205 material fasteners: There is no problem in using them in acidic environments such as phosphoric acid and chloride

904L material fasteners: No problem when exposed to chlorides, seawater at 70°C, and sulfur and acid solutions

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