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Why stainless steel cable railing hardware rust?

Mar 05, 2018

When the stainless steel cable railing hardware surface brown rust (point), when people were surprised that "stainless steel is not rusty, rust is not stainless steel, steel may be a problem." In fact, this is a one-sided misconception that stainless steel is poorly understood. Stainless steel will rust under certain conditions.

Stainless steel has the ability to resist atmospheric oxidation - that is, stainless steel, but also has acid, alkali, salt medium corrosion - that is, corrosion resistance. However, its corrosion resistance is the size of its own chemical composition of steel, plus the mutual state, the use of conditions and the type of environmental media and change. Such as 304 steel, in the dry and clean atmosphere, there is absolutely excellent resistance to corrosion, but to move it to the beach area, in the sea fog containing a lot of salt, it will soon rust; and 316 steel pipe performance good. Therefore, not any kind of stainless steel, in any environment can be corrosion-resistant, non-rusting.

Surface film damage in many forms, more common in everyday life are the following:

Stainless steel is formed by its surface layer of very thin and strong and stable chromium-rich oxide film (protective film), to prevent the continued infiltration of oxygen atoms, continue oxidation, and corrosion resistance. Once for some reason, the film was continuously damaged, the air or liquid oxygen atoms will continue to infiltrate or continuous separation of iron atoms in the metal, the formation of loose iron oxide, the metal surface will also continue to rust. This surface film is damaged in many forms, more common in everyday life are the following:

1. Stainless steel cable railing surface with deposits of other metal elements containing dust or heterogeneous metal particles attached to the humid air, the condensate between the attachment and stainless steel, the two connected into a micro-cell, triggering the electrochemical reaction , The protective film is damaged, called electrochemical corrosion.

2. Stainless steel cable railing surface adhesion of organic juice (such as vegetables, noodles soup, sputum, etc.), in the case of water oxygen, organic acids, organic acids for a long time on the metal surface corrosion.

3. Stainless steel cable railing surface adhesion contains acid, alkali, salts (such as the renovation of the wall of alkali water, lime splashing), causing local corrosion.

4. In polluted air (such as a large amount of sulfide, carbon dioxide, nitrogen oxides in the atmosphere), the case of condensate, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.(TERADA HARDWARE/www.teradahardware.com)

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