Corrosion Resistant Alloy

Alloys in contact with different media will face different corrosion conditions. The temperature and concentration of the media are also important influencing factors.
General corrosion is usually visible and is relatively stable. The localized corrosion is often difficult to detect, but its destructive power is huge, which can easily lead to serious accidents.

Common Cases Of Corrosion Failure

General Corrosion

Concentrated sulfuric acid and nitric acid are both oxidizing, and Cr, Si, Al and other elements are oxidized to form a dense oxide film to protect the base metal. Hydrochloric acid is a non-oxidizing acid, most alloys cannot react with it to form an oxidation protective film. At the same time, the active chloride ion destroys the metal passivation. Therefore, the damage to the alloy is often the most serious. Alloy 600, Alloy 625, C-276, B-3, etc. are common corrosion-resistant alloys.

Localized Corrosion

The mechanism of crevice corrosion and pitting corrosion is the same. Crevice corrosion is common in gaskets, cavities, etc. where corrosive media is easily deposited. Pitting corrosion starts from a small hole on the metal surface and develops into the interior of the material, so it is difficult to detect.
Both often occur on alloy surfaces that rely on passivation films or oxides as protection. This kind of corrosion will induce stress corrosion, and it will break quickly to a certain extent. Therefore, it will often cause catastrophic accidents.
The higher the PREN value of the material, the stronger the resistance to local corrosion. Cr, Mo, N are the most important three elements. Duplex stainless steel has a higher PREN value

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