48030

Stainless steel coloring  

March 3, 2008

we are in the process of doing the stainless steel cloloring works. Mix of H2SO4 (d=1.84)of 490g/l and CRO4 of 250g/l at the temp of 70 - 90 degree C.
We only can get 4 relative color so far; with the "blue" "gold" and "violet". But my question is that is it the only colors I can get by using this Inco method?
Please guide me here and hope I can get the help I needed!

Teck Lau
stainless steel coloring - Sibu, Sarawak, Malaysia

Try next solution:1 lit sulphuric acid/7,5 gm potassium bichromate.Lead cathode,70-95 C/1,3 V-0.06 a/dm2.5-50 min. immersion.Brown-blue-redbrown-purple-green colour sequence.Only for 18/8 SS!Hope it helps and good luck!

Goran Budija
- Zagreb, Croatia