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Letter 3908
Should we Stir a decorative chrome bath
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This has been initiated after reading letter
No: 3840 about stirring the Hard Chrome baths which seems to have
everybody's approval to do so.
What about Decorative Chrome plating baths based on only Chromic
Acid and are routinely treated with Barium Carbonate leading to
precipitation of Barium Sulphate as a thick sludge which we decant
and throw away once in 15 days ? We also add a proprietary catalyst
which brings down burning and improves coverage and also improves the
blue shade.
I don't know if this is an SRHS catalyst and if this requires to
be stirred same as the Hard Chrome SRHS Catalyst, but would the same
advice of stirring the bath before work be applicable to my type of
Decorative Chrome bath as well or would it result in other problems
if we stir up the sludge portion in order for the catalyst to
function better ?
We have been conditioned to let sleeping sludges lie on account of
our experience mainly in cyanide zinc baths. What is a correct
procedure for startup and running of this type of a decorative chrome
bath as described above ?
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Khozema
Vahanwala
Saify Ind
Bangalore, Karnataka, India
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Decorative or hard chrome, the supplier of the catalyst will tell
you if the sludge must be stirred back into solution.
I am guessing that your catalyst is a fully soluble fluoride and
probably doesn't need to be "hoed up".
Since decorative chromium plating is so thin, and the efficiency
is so low, particle roughness is not a problem.
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