Why do stainless steel electric heating pipes also rust?

Why do stainless steel electric heating pipes also rust?

When the surface of the stainless steel electric heating tube showed brown rust spots (spots), people were greatly surprised: they thought that "stainless steel does not rust, and if it rusts, it is not real stainless steel. It may be that the heating tube factory replaced stainless steel with other materials.". Actually, it's not the case. Stainless steel can also rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation without rusting, and also has the ability to resist corrosion in media containing acids, alkalis, and salts, that is, corrosion resistance. But its ability to resist corrosion varies depending on the chemical composition of the steel itself, its condition, operating conditions, and the type of environmental medium. For example, 304 steel pipe has excellent rust resistance in a dry and clean atmosphere. If it is moved to a coastal area, it will quickly rust in the mist rich in salt, while 316 steel shows outstanding performance. Therefore, not any type of stainless steel can withstand corrosion and rust in any environment.

Stainless steel electric heating tubes are composed of an extremely thin and dense layer of stable chromium rich oxide film (protective film) on their surface, which prevents oxygen atoms from continuously entering and oxidizing, thus achieving corrosion resistance. Once for some reason, this thin film is constantly damaged, and oxygen atoms in the air or liquid will continuously enter or separate from the metal iron atoms, forming loose droplets of iron oxide, and the metal surface will also be constantly corroded.

To ensure a long-lasting bright metal surface and prevent rusting, Hongchuang Electric advocates that it is necessary to regularly clean and wipe the stainless steel surface during decoration, remove attachments, and eliminate external factors that may cause polishing. The coastal area should use 316 stainless steel, which can resist seawater corrosion.

So, when we encounter the question of stainless steel heating pipes rusting, we should understand what it is.

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