Often surprised to hear people ask "stainless steel, how has rusted out?" Immediately that the steel could be a problem, in fact, this is a lack of understanding of stainless steel as a one-sided view of stainless steel, under certain conditions will be rusty.
Stainless steel is by its very thin layer formed on the surface and solid stability of dense chromium-rich oxide film (protective film), to prevent the continued infiltration of oxygen atoms to continue to oxidation, while the accessibility to anti-corrosion ability. But the size of the corrosion resistance of steel with its own chemical composition, plus in each state, the use of conditions and the environmental media, the type of change. Once there is some reason, this film was the constant destruction, air or liquid oxygen atom will continue to infiltrate or metal from the iron atoms in constant evolution out of the formation of porous iron oxide, metal surface corrosion also been continuously . Such as 304 steel, in the dry and clean atmosphere,
There is absolutely excellent anti-corrosion capabilities, but will move it to the waterfront area, contains large amounts of salt in the sea mist, will soon rust; and 316 steel are to perform well. So it is not any kind of stainless steel, in any circumstances are not rust corrosion capability.
Surface film in the form of damage to a lot more common in daily life are:
1. Stainless steel surface adhesion containing acid, alkali, salts (such as a wall decoration alkaline, lime splash), causing localized corrosion.
2. Polluting the air (which contain a large number of sulfide, carbon dioxide, nitrogen oxides in the atmosphere), case of condensation water to form sulfuric acid, nitric acid, acetic acid solution point, causing chemical corrosion.
3. Stainless steel surface-deposit product with other metal elements containing dust or metal particles heterogeneous attachments, in the humid air, fixtures and stainless steel between the condensate, causing electrochemical reaction, protective film damage, known as electrochemical corrosion.
4. Stainless steel surface adhesion of organic juice, in the case of water oxygen to form organic acids, organic acids would be a long time the formation of corrosion on the metal surface.
The above can be caused by stainless steel corrosion caused the destruction of protective films. Therefore, in order to ensure a permanent shiny metal surface, not to be rusty, we propose:
1. Some of stainless steel pipes on the market can not meet the corresponding chemical composition of the national standard and, if not reach 304 material requirements, can also cause rust, which requires the user to select products from reputable manufacturers.
2, must always be cleaned for the decorative stainless steel scrub, remove attachments, eliminating lead to modification of the external factors.
3. Waterfront material to use 316 stainless steel 316 material resistant to seawater corrosion.