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"No color after plating"


I would like to find out are there any mistake with my setup , I had made up a 10 litre (concentrated) h2so4 bath adding 75 grms of sodium dichromate into it , plating my stainless steel (304) panel size 3 by 5 inch , heating the solution up to 75 degree c , using lead as cathode . plate it for about 30 mins at 5 to 7 v but there is not any colour effect , instead the surface of my panel became like tarnish and had flow marks which I do not know what is that ... Can any one please advise me what should I do ..?

Roy Choon
plating shop - China


Sorry, I've never heard of such a process. Where did you hear of it, and what did you expect it to do? Like what color were you expecting, for example, please? Thanks!

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


The solution is a mixture of sulphuric acid n sodium diachromate or sulphuric acid n chromic acid.

Roy Choon
Plating - China


I need advise how could I get colour on stainless steel , I need some colouring on stainless steel(304) panels size 3 by 5 inches , reading some articles from here eg. letter No.35735 and 33236 , I actually try out the method at letter No.36330 posted by me . I am expecting blue or black colour on SS(304)panels ....

Roy Choon
plating - China


Fishlock in his book on metal colouring gives somewhat different formula than Dettner/Elzes Handbook:
sulphuric acid 250 ml/lit water
sodium dichromate 60 gr/lit
70-95 C,anodic current 0,6 A/sq.ft
Colour sequence: brown, blue bronze, reddish brown, deep purple to green (45 minutes time). Lead anode. Only for 18/8 steel.
Hope it helps!

Goran Budija
- Zagreb, Croatia

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