The stainless steel is famous for its highly resistance to strong acid and strong alkali, nondiscolouring, non-allergic, hard and bright. But some customers found that the stainless steel jewelry rusted after wearing several time. What was the reason for that?
The rust-resistant and anticorrosion capacity of the stainless steel is depend on factors of its chemical ingredients, using condition and wearing environment. Different stainless steel textures have different anticorrosion capacity.
Stainless steel is preventing the infiltration of oxygen atoms by a very thin and stable Cr-rich protective oxide film formed on the surface, and obtain the anticorrosion ability.
For if some reasons, the protective films damaged, the oxygen atoms existed in the air or water will continuously into the metal, that will cause the iron atoms been come out and form loose Iron oxide, the surface of the metal will be rusted continuously.
2. If the stainless steel stick with organic matter juice (such as melons, noodle soup), the juice will turn into organic acid and eat the metal's surface after a long time.
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3. If the stainless steel stick with acids, alkalis or salts (such as the alkaline water or lime water used in decoration), will caused by localized chloride corrosion.
Corrosion resistance order of the common stainless steel is 316L＞316＞304L＞304＞202＞201＞403＞420. So, the most stable and no rust stainless steel is 316L stainless steel, jewelry used the 316L stainless steel as raw material is also the best choice.
Therefore, it's not any kind of stainless steel can be rust-resistant and anticorrosion in any environments.
4. The pollutants in the polluted air (such as the air contain lots of sulfide, carbon dioxide or nitrogen oxides), will formed sulfuric acid, nitric acid or acetic acid droplets and rust the surface of the stainless steel , when they condensed in condensed water.
Such example is very much, as following are the most common examples in our daily life.
1. The surface of the stainless steel was covered by the foreign matte contained the dust of other metals, it will occurred electrochemical reaction and damage the protective films, we called it electrochemical corrosion.
For example, the 304 stainless steel has good rust-resistant capacity in the clean and dry air, but take it to the shore region; it will rust in the sea fog which has lots of salt. But 316L stainless steel is behaved well, so if you choose the stainless steel jewelry, it's better to choose 316L Stainless Steel Jewellery.
At the same time, when wearingStainless Steel Jewelry, we should pay more attentions to avoid the stainliess steel jewelry contact with strong acid and alkali; it can prevent the stainless steel jewelry from rust.
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