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When the stainless steel tube surface appear brown rust (point) of the time, people are surprised: "the stainless steel does not rust, rust is stainless steel, may be steel problems". In fact, this is a kind of one-sided wrong view of the lack of understanding of stainless steel. Stainless steel rust in certain conditions of the.
Stainless steel with atmospheric oxidation resistance ability --- not rust, but also has the acid, alkali, salt medium is the ability to corrosion - corrosion resistance. But its corrosion resistance is the size of steel with its own chemical composition, increase mutual status, conditions of use and environmental media type and change. As of 304 steel, in a clean dry air, is absolutely good corrosion resistance, but it will be moved to the beach area, with large amounts of salt fog, will rust quickly; and the good performance of 316 steel pipe. Therefore, not any kind of stainless steel, the ability in any environment corrosion, rust.
Stainless steel is a thin layer on the surface of the formation and the stability of the fine solid chromium rich oxide film (protective film), to prevent the infiltration of oxygen atoms, to oxidation, and the ability to obtain anti-corrosion. Once there are some reasons, this film was constantly undermined, air or liquid oxygen atoms will continue to infiltrate or metal atoms of iron to keep out from it, the loose formation of iron oxide, the metal surface is subject to constant corrosion. Many of these surface membrane damage in the form of daily life to see are as follows:
1 stainless steel surface deposition of dust or heterogeneous metal particles containing other metal elements of attachments in the humid air, condensation water and stainless steel adhesion between, and the two together into a micro battery, causing the electrochemical reaction, the protective film is damaged, termed the electrochemical corrosion.
2 stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum), in the case of water oxygen to form organic acid, organic acids are long on the surface of metal corrosion.
3 stainless steel surface adhesion containing acid, alkali, salt material (such as wall decoration, stone alkaline ash water splash), caused by the localized corrosion.
4 in air pollution (such as containing a large amount of sulfide, carbon dioxide, nitrogen oxide atmosphere), meets the condensed water to form sulfuric acid, nitric acid, acetic acid, liquid, caused by chemical corrosion.
The above conditions can cause surface protective film destruction caused by corrosion of stainless steel. So, in order to ensure the permanent shiny metal surface, can not be corroded, we recommend:
1 should be cleaned regularly to the decorative stainless steel surface, remove attachments, eliminate lead to modification of the external factors.
The 2 coastal areas to use 316 stainless steel, 316 materials can resist corrosion in seawater.
3 the market some chemical composition of stainless steel pipes can not meet the relevant national standards, amounting to less than 304