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Chrome In Cleaners

Hi Can we add sodium hydrosulfite ⇦ this on eBay or Amazon zincaffil links] in our electro cleaners to reduce hexavalent chrome. Currently we are at 2000 ppm of Chrome in cleaners.

If so, then what would be the by products and would they affect the cleaning process or the life index of the bath.

Also what else can we do to reduce any chrome in cleaners. Thanks

Hemant Kumar
- Florida, USA
2000

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Hi Hermant.

You can use dextrose to reduce the hexavalent chrome to trivalent chrome.

Regard

Anders S

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
2000

Hemant,

We use sodium hydrosulfite all the time in our cleaners without any residual effects. The by products I'm not sure, but to reduce if you have coated racks that are cracked or have holes they should be fixed they hold a lot of solution. Unfortunately it is usually the solution that causes problems.

KH

Ken Hutchinson
- Minneapolis, Minnesota, USA
2000

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Steve Rudy in his Finishers Think Tank column in the February, 2000 issue of Plating and Surface Finishing gives a nice recap on the handling of hexavalent chromium in an electrocleaner (page 47).

Ken Lemke
Burlington, Ontario, Canada
2000

Thanks Mr. Lemke.

you already gave me some good piece of advice on this topic during our meeting at the AESF/CAMF branch gathering.

I will try to get that paper which you indicated here.

regards

hemant bansal

Hemant Kumar
- Florida, USA
2000