Is the stainless steel mesh really rustless? Is the rusty stainless steel mesh fake? Why is the stainless steel mesh rusty? Below, we will find out one by one. Stainless steel is a major invention of the iron and steel industry, and stainless steel products have been widely used in every family. Its corrosion resistance has won the favor of the majority of consumers, especially the 80's and 90's. However, some people recently reported that some stainless steel products stainless steel wire mesh rusty, questioned that this is fake and inferior products.
Although a small part of the products are inferior, most of them are qualified, but people lack of understanding of stainless steel. Stainless steel is an alloy with iron as its main material. Chromium element forms a very thin, high strength, high density and stable chromium rich oxide film (protective film) on the surface of stainless steel. This kind of film successfully prevents the permeation of oxygen molecules, so that stainless steel has the ability of anti-corrosion.
However, if the film is constantly damaged, the oxygen in the air or liquid will continue to penetrate, or the iron atoms in the metal will continue to be exposed, forming loose iron oxide, and the metal surface will continue to be eroded. There are many kinds of surface forms of stainless steel wire mesh damaged by film, and there are several common types in daily life: accessories containing other metal elements on the deposited surface of stainless steel wire mesh, metal particles dust or humid air, accessories and stainless steel wire mesh, and the condensate between the two as a micro battery, triggered the electrochemical reaction.
The destruction of the protective film is called electrochemical corrosion. The surface of stainless steel mesh is attached with organic juice (such as vegetable, noodle soup, sputum, etc.), which corrodes the metal surface for a long time in the presence of water, oxygen, organic acid and organic acid. The surface of stainless steel mesh contains acid, alkali, salt and other substances (such as alkali water, lime water, etc.) which cause local corrosion.
In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon and nitrogen oxides), when meeting with condensed water, liquid points such as sulfuric acid, nitric acid and acetic acid will be formed, causing chemical corrosion. All of the above conditions may cause stainless steel wire mesh rust, so stainless steel wire mesh is not completely rusty. In order to keep its surface permanently bright, it is necessary to clean and passivate its surface.