Why does stainless steel products rust too?

At Dongfu Wire Mesh, they offer a variety of different alloys of woven wire mesh or other metal products, but most popular metal is stainless steel.


What is stainless steel?

Stainless steel is an alloy of iron and carbon as the main raw materials, and its corrosion resistance comes mainly from the chromium element in the alloy. The chromium element forms an extremely thin, strong and fine stable chromium-rich oxide film (protective film) on the surface of stainless steel, which successfully prevents the penetration of oxygen molecules, thus making stainless steel resistant to corrosion. However, if this film constantly suffers damage, oxygen in the air or liquid will continue to infiltrate or the iron atoms in the metal are constantly exposed, forming loose iron oxide, the metal surface will be constantly eroded.


Under what circumstances stainless steel will also be corroded?

The surface film of stainless steel products is damaged in many forms, the following are common in daily life.


Stainless steel surface stored with dust or foreign metal particles containing the attachment of other metal elements, in the humid air, the attachment and stainless steel condensation occurs between the two will be connected into a microcell, triggering an electrochemical reaction, the protective film is destroyed, known as electrochemical corrosion.


Stainless steel surface adhesion of organic matter juice (such as melon, noodle soup, saliva, etc.), in the role of water and oxygen, constitute an organic acid, over time, then organic acid corrosion of the metal surface.


Stainless steel surface adhesion containing acids, alkalis, salts (such as decorative wall alkaline water, lime water spray), resulting in local corrosion.


In the polluted air (such as a large number of sulfides, carbon dioxide, nitrogen oxides in the atmosphere), condensation, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.


All of the above will cause damage to the surface protective film of stainless steel, thus rusting, so stainless steel is not completely rust-free, to keep the metal surface permanently bright, it is necessary to do cleaning, passivation and other treatments on its surface. So if you are using stainless steel products or pay a little attention to the use of the environment and the use of the way, so as to increase its service life.


Therefore, to ensure that the metal surface is permanently bright and does not rust recommended.


Decorative stainless steel surface should be frequently cleaned and scrubbed to remove adhesions and eliminate external factors that trigger retouching.


Beach areas to use 316 stainless steel, 316 material can resist the corrosion of seawater.


Some stainless steel tubes on the market have a chemical composition that does not meet the corresponding national standards and does not meet the requirements of 304 material. Therefore, it can also cause rust, which requires users to carefully select the products of reputable manufacturers.