When the steel appears rusty, many people will think that the steel is abnormal, maybe the steel is out of order. In fact, this is a one-sided misconception and lack of knowledge of deformed steels. The deformed steel will rust under certain conditions. The section steel forms a very thin, firm, fine and stable chromium rich oxide film (protective film) on its surface. Prevent oxygen atoms from continuing to penetrate and oxidize, and obtain corrosion resistance. Once for any reason, the cell membrane will continue to be destroyed. Oxygen atoms in air or liquid continue to penetrate, or iron atoms in metal continue to precipitate, forming loose iron oxide, and the metal surface is constantly corroded. There are various forms of damage to the surface film.

1. Alkali, acid, salt and other substances (such as alkali water and lime water of decorative wall) are attached to the surface of special-shaped steel, resulting in local corrosion.

2. Organic juices (such as noodle soup, melon, sputum, etc.) are attached to the surface of special-shaped steel to form organic acids in the presence of water and oxygen, which corrode the metal surface for a long time.

3. In the polluted air (such as the atmosphere containing a large amount of sulfide, oxidized carbon and nitrogen oxides), when condensate occurs, sulfuric acid, nitric acid and acetic acid liquid points will be formed, resulting in chemical corrosion.

4. The dust of accessories containing other metal elements or different metal particles is deposited on the surface of special-shaped steel. In humid air, the condensate between the attachment and stainless steel is connected to form a micro battery, which leads to power generation chemical reaction and destroys the protective film, which is called electrochemical corrosion.

How to ensure that the metal surface is bright without corrosion? Special shaped steel manufacturer to answer:

In order to ensure the brightness of the metal surface is not corroded, it is recommended that:

1. 316 stainless steel is used in seaside area, and 316 materials are resistant to seawater corrosion.

2. it is necessary to wash and scrub the surface of stainless steel regularly, remove attachments, and eliminate the external factors that cause modification.

3.Some special-shaped toughening materials in the market do not meet the corresponding standards and 304 material requirements. This will also lead to rust, which requires users to choose products of reputable manufacturers carefully.