Ted Mooney, P.E. RET
- Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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RoHS compliance in chem film for aluminum
My customers are asking for RoHS compliant chem film on aluminum parts. My plating shop says that means to use clear chem film instead of gold. Is that correct?
Todd Bowersmachine shop - San Jose, California, USA
February 9, 2009
RoHS compliant chem film is clear. - Kingston, Ontario, Canada Todd - Colorado Springs, Colorado Most yes. The trivalent conversion coatings for aluminum are anywhere from clear to light gray in color. Any other color is generally the result of post process dye dips and will reduce corrosion protection. process supplier - Great Neck, New York No, it means you must use trivalent chromate and not hexavalent chromate. The commercial trivalent chromates, however, do produce an almost "clear" coating, maybe slightly purple tint that some would call clear. Robert H Probert Robert H Probert Technical Services Garner, North Carolina Your plater is partly correct. Some clear chromating solution do contain hexavalent chromium and are not RoHS compliant. There are Trivalent Chromating process (TCP) which is clear/ - Penang, Malaysia |
Q. NEED LIST OF CHEMICAL MANUFACTURERS WHO HAVE A GOLD/YELLOW COLOR CHEM FILM PRODUCT THAT IS APPROVED UNDER THE SPEC QPL-81706-16 THAT IS TY II AND AN RoHS APPROVED PRODUCT. I KNOW OF CLEAR BUT WHO HAS GOLD/YELLOW ?
- Gardena, California, USA
August 16, 2012
A. The TCP based ROHS complying passivation is almost clear.
Look for a Permanganate based passivation which is yellow-brownish.
Sara Michaeli
Tel-Aviv-Yafo, Israel
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