Why will rust stainless steel valve
Maintenance of valves in stainless steel, stainless steel valves will often see the rust, in the conventional understanding, stainless steel should not rust, and rust is not stainless steel that could be a problem, but in life and production the process, this phenomenon Instead, we often see, in fact, this is a lack of understanding of stainless steel as a one-sided view of the error. Stainless steel under certain conditions, will be rusty. It will rust stainless steel valves Why then?
Stainless steel valves are resistant to atmospheric oxidation capacity - that is, stainless steel, while also have the acid, alkali and salt corrosion resistance ability of the medium that is - resistance to corrosion. But the size of the corrosion resistance of steel with its own chemical composition, each state, the use of conditions and the environmental media, the type of change. So it is not any kind of stainless steel, corrosion capability at any time, not rusty.
Stainless steel is formed by the surface layer of very thin but dense stable solid chromium-rich oxide film (protective film), to prevent infiltration of oxygen atoms to continue to continue to oxide, while the accessibility to anti-corrosion ability. 1 However, for some reason, this film has been continuously destroyed, air or liquid and oxygen atoms will continue to infiltrate or metal from the iron atom out of ongoing analysis, the formation of loose iron oxide, metal surface also subjected to constant corrosion, this surface film in the form of destruction of many more common in daily life are the following categories:
1, stainless steel surface-deposit savings and other metal elements containing dust or metal particles heterogeneous attachments, in the humid air, fixtures and stainless steel between the condensate will allow the two together into one micro-cell, triggering the electrochemical reaction, protective film damage, funding, described as electrochemical corrosion.
2, stainless steel surface adhesion with organic juices (such as vegetables, soup, etc.), in the case of water oxygen to form organic acids, organic acids were formed a long time on the metal surface corrosion.
3, stainless steel surface adhesion containing acid, alkali, salts (such as a wall decoration alkaline, lime spray test) caused by localized corrosion;
4, when there is pollution in the air (containing a large number of sulfide, oxide, hydrogen peroxide atmosphere), the event of condensation water forms sulfuric acid, nitric acid, acetic acid solution point, causing chemical corrosion.
Above the surface of stainless steel protective film can be caused by the destruction caused by corrosion, therefore, to ensure a permanent shiny metal surface, not to be rusty, Jiangyin City, Oulei Si recommendations: the need to keep the decorative stainless steel surface cleaning scrub, remove rust caused The external factors. |
