Quote from: chris
does the chromium form an oxide on the surface?Stainless steel alloys consist of 13%-26% chromium.
- The iron oxidises, shrinks and falls off. In bulk, iron oxides are the familiar rust-red color.
- The chromium oxidizes and remains bonded to the metal, producing a thin, clear layer which protects the metal underneath.
I presume that the initial oxide layer would be enhanced by chemical means in the factory.
But scratches occurring during normal use are self-healing.
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Quote from: ChiralSPO
mercury will react with aluminum to form an alloy that will oxidize before your very eyes!This is why mercury is banned on planes (planes are mostly built from aluminum alloys).
Barometers and thermometers are banned - old barometers and thermometers were filled with mercury.
Modern smartphones often have a barometer and thermometer, but these are built out of silicon, and aren't a threat to planes.