Surface corrosion on stainless steel is identified by
- red rust.
- white film.
- black pitting.
Explanation
Stainless steel resists ordinary rusting, so surface corrosion shows as small black pits where the passive chromium-oxide layer has broken down locally. Red rust is typical of plain carbon steel and a white film of aluminium, not of stainless steel.
Gibbo280490 asking:
Why is this not Red Rust? i can find nowhere that states Surface corrosion on steel is 'Black Pitting'
Community Comments (2)
J
Jordi Posts: 198 16.05.2020 / 16:53
i dont have a clue.
S
Slick Rick 88 Posts: 1 07.11.2020 / 12:05
red rust can be spotted on normal steel but on stainsless steel it's black pitting
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