The Protective Coat On The Stainless Steel

- Sep 28, 2018 -

                                                                                                                                ——From HONGWANG Office

There is a extremely thin and firm chromium oxide film, as well as the protective cost, existing in the stainless steel which can prevent the oxygen atoms from continuing to infiltrate and oxidize an then resist rust. Once the film is destroyed, oxygen atoms in the air or liquid will continue to infiltrate. The iron atoms in the metal will be continuously separated, forming loose iron oxide, and the metal surface will be continuously rusted. There are many forms of such surface film damage, and the following are common in daily life:



1. There are deposits of dust or dissimilar metal particles containing other metal elements on the surface of the stainless steel. In humid air, the condensed water between the deposit and the stainless steel is connected into a micro battery, which triggers an electrochemical reaction. The protective coat is damaged, which is called electrochemical corrosion.

    2. The surface of the stainless steel adheres to the organic juice (such as melon, noodle soup, glutinous rice, etc.), and it will become an organic acid under the water and oxygen, which corrodes the metal surface for a long time.

    3. The acid, alkali and salt substances (such as alkali water and lime water splashing on the wall) existing on the surface of the stainless steel would result in local corrosion.

    4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), there will be sulfuric acid, nitric acid, acetic acid liquid point in the case of condensed water and it will cause chemical corrosion.

     All of the above can cause the corrosion of the protective coat on the stainless steel surface. Therefore, in order to ensure that the metal surface is permanently bright and does not rust, we recommend that:

    1. Clean the decorative stainless steel surface regularly and remove the deposits external factors that could cause modification.

    2. when we are in the seaside area, we can use 316 stainless steel as 316 material can avoid seawater corrosion.

    3. there are some stainless steel cannot achieve the national standards and the 304 material requirements. It will also cause rust. Therefore the customers need to carefully select the products from relible manufacturers.

Contact: Una Chen

WuXi XiChu Stainless Steel Co.,Ltd


Add: B2-135,Stainless Steel Market, No.82 North XueDian Road

         City Wuxi, JiangSu, 214000,China

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