Why do screw stainless rust? How should rust be removed?

Stainless steel screws for most people’s impression, screw stainless are not rust, but in fact, stainless steel screws use a certain amount of time, or will occur to varying degrees of rust, if the stainless steel encountered the following situation, stainless steel screws rust speed will accelerate.

Because screw stainless rust prevention principle is because stainless steel materials contain chromium elements, the surface of stainless steel screws formed chromium oxide protective film, can effectively isolate the contact between stainless steel and air.Oxygen in the air can not enter the steel to produce chemical reactions, thus achieving the effect of rust prevention.So.Stainless steel screws are not always rust, but not easy to rust, when the stainless steel screw surface protection film is damaged, will soon rust.

Stainless steel screw surface if there is other metal non-toxic dust or other metal particles.In moist air, the attachment is in contact with condensed water on the surface of the stainless steel.The two will be connected into a micro battery, causing a chemical reaction, the damage of stainless steel screws chromium protective film, electrochemical corrosion, resulting in the rust of screw stainless.

Stainless steel screw surface such as adhesion to the juice of other organic matter, (such as melon and vegetable, noodle soup, etc.), in the water oxygen environment constitute organic acid, corrosion surface protective film.

Screw stainless surface adhesion to acid, alkali, salt substances (such as decorative walls of alkali, limestone splash), causing local corrosion.

In polluted air (such as the atmosphere containing a lot of sulfide, carbon oxide, nitrogen oxide), when condensed water, sulfuric acid, nitric acid, acetic acid liquid point, cause chemical corrosion.In China’s coastal areas, because close to the sea, the air contains a lot of salt, and the air temperature is larger, often lead to the phenomenon of stainless steel screw surface oxidation rust.However, it is possible to extend the service life of stainless steel screws by surface treatment.

Such as dacromet surface treatment or replacement of other materials, but stainless steel screw fasteners used in a wide range of applications.Because it has a certain anti-rust and anti-corrosion effect, so stainless steel screws rust how should we remove rust?

1. Firstly, remove dirt from the surface of stainless steel screws.

2. Use alcohol to remove the rust on the surface of stainless steel screws to restore brightness

3. In order to extend the shining time of stainless steel screws, it is recommended to apply a layer of protective grease on the surface of stainless steel screws after cleaning.Isolate oxygen in the air from contact with stainless steel screws to extend the service life of stainless steel screws.

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