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Old 30th November 2012, 09:09 PM
neilL neilL is offline
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Join Date: Mar 2010
Member of: NOFTC CRPC
Location: Oxford
Posts: 576

Aluminium always has an oxide layer which can be made thicker and porous which can then hold a dye i.e. "anodising" but Titanium can be heat treated to form either a carbide or nitride (or a mix of both) coating which is extremely tough and depending on the coating thickness will have a somewhat golden colour. I think the coloured titanium finish is a thin oxide layer and is not really coloured but just the wavelength of light that is reflected. The TiC or TiN coatings need quite severe heat treatment and would not be something a pressure cylinder would take to :-)

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