Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Pre galvanized steel RoHS compliant?
2006
Q. What we want to know is Pre-plated steel/pre-galvanize steel RoHS compliant? Explanation of RoHS is:
"The restriction of hazardous substances (RoHS) in electrical and electronic equipment is regulated by Directive 2002/95/EC issued January 27, 2003, by the European Parliament and Council. This directive will become effective July 1st 2006 and impacts all suppliers in the electrical and electronic markets and industries. The following substances are covered by this directive and will be controlled at first by establishing maximum concentration limits and then ultimately eliminated.
Lead 0.1% of weight 1000 mg/kg 1000 ppm
Mercury (Hg) 0.1% of weight 1000 mg/kg 1000 ppm
Cadmium (Cd)* 0.01 % of weight 100 mg/kg 100 ppm
Hexavalent Chromium (CrV1) 0.1% of weight 1000 mg/kg 1000 ppm
Polybrominated Diphenyl Ethers 0.1% of weight 1000 mg/kg 1000 ppm
Polybrominated Biphenyls (PBS) 0.1% of weight 1000 mg/kg 1000 ppm"
Waiting for an answer,
- Fremont, California, USA
A. The answer depends on what type of chromate was used. Ask your supplier if it is trivalent or hexavalent chromated.
Hexavalent chromates are NOT RoHS compliant.
- San Jose, California, USA
2006
A. Ask your supplier.
John Martin- Wales
2006
A. RoHS compliant galvanized steel is now available in the U.S. Check with your supplier. Not all distributors have it, not all distributors think they have to switch.
Denise Noling- Vadnais Heights, Minnesota
2006
Q. I have heard that the non-RoHS compliant chem-treat is more effective against white rust than the RoHS compliant versions. Is this true? Are there any independent, objective studies that have tested and compared Hexavalent vs Trivalent versions? Thanks! Nic
Nic Costanzo- Renton, Washington, USA
November 21, 2012
October 2013
Hi Nic. There have been dozens of such studies but the answers are never universally clear because all trivalent chromates, and most hexavalent chromates, are proprietary and offer differing levels of performance. But the short answer is that today's trivalent chromates from any major supplier will match the corrosion fighting performance of their hexavalent predecessors -- but are necessarily the equivalent in all ways. For example, there have been repetitive issues with conductivity, paint adhesion, and chemical resistance to post processing solutions depending on the particular proprietary.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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