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Stainless steel tips

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Stainless steel tips

Maio 24, 2019


Many people think that stainless steel will not rust.
Actually otherwise, all things have a life, stainless steel is also a kind of metal, metal in nature will be oxidized corrosion, causing the phenomenon of rust; The only difference is the material or degree of protection, which can minimize the probability and time of rust.

Contudo, in many cases, stainless steel will also berusty”, the following is to explain the stainless steel rust several bigculprit” :

1. Chlorine ion exists in the service environment
Chlorine ion mainly exists in the purification of liquid and gas, stainless steel in the presence of chlorine ion in the environment, will accelerate the degree of its corrosion, even more than ordinary low carbon steel.

2. Without solid solution treatment
Solid solution treatment: the process of heating the alloy to high temperature and maintaining constant temperature in the single-phase region, so that the surplus phase is fully dissolved in the solid solution and then rapidly cooled to obtain? Heat treatment of supersaturated solid solution.
The purpose is to make all phases of the alloy fully dissolved, strengthen the solid solution, improve toughness and corrosion resistance, eliminate stress and softening, so as to continue processing or forming.
If the alloy element is not dissolved into the matrix material, the matrix structure alloy content is low and the corrosion resistance is poor.

3. Natural intercrystalline corrosion
Stainless steel in the corrosive medium, in the grain between a corrosion phenomenon known as intergranular corrosion.
The stainless steel that produces intercrystalline corrosion, when be subjected to stress action, can break along grain boundary namely, intensity disappears almost completely, this is one of the most dangerous forms of damage that stainless steel.
Stainless steel does not rust because chromium (Cr) and nickel (Ni) content has reached a certain standard. And the two alloys are the key to whether steel is rustproof.
Geralmente, stainless steel produced by small factories will rust, the main reason is the low content of nickel (nickel cost price largely reflects the benchmark price of stainless steel); If the nickel content of all kinds of stainless steel requirements above the standard, no matter how cut will not rust.

4, mechanical stress corrosion
Stainless steel products are made by stamping, cutting, punching, stretching, grinding, shearing, flexão, planing, hot cutting or welding.

Due to the external stress loading, the processing parts and their edges will be damaged to a large extent by their own stress, resulting in the intercrystalline phase transition. Thus destroyed its own due corrosion resistance, speed up the process of its rust.

5. Damage of surface passivation protective layer
Passivation is a method to change the metal surface into a state which is not easy to be oxidized and to delay the corrosion speed of the metal.
Passivation is due to the metal and oxidizing substances, the role of the metal surface to generate a very thin, dense, good coverage performance, firmly adsorbed on the metal surface passivation film.
Once this layer ofprotective filmis damaged by external forces (mainly large area of scratches), stainless steel as if there is no resistance to the body, it is easy to produce oxidation reaction with the outside and rust corrosion.

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