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44082
Paint prep concerns when changing from
Hex Chromium to Tri Chromium plated material?
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Our Company has recently changed from a Hex Chromium plated Z-grip
galvanized Steel to a Tri Chromium process. Using the same paint prep
techniques, we ended up with a contamination "smearing effect" under
the paint when using reducer to clean the part prior to paint. This
was eliminated by changing our process to cleaning with a T-24 and
then a reducer prior to paint.
My question is, are there any chemical differences between Tri and
Hex Chromium plating that would leave a residue and effect a painting
process or is this likely a rouge contaminate?
John McNeely
Electro-mechanical Manufacturuer - Florence, KY, USA
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Why are you painting chrome plate?? I suspect that you mean
chromate treated aluminum or zinc plate. Am I correct??
James Watts
- Navarre, Florida
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Yes you are correct
John McNeely
- Florence, KY
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It is not uncommon for platers who've "gone trivalent" to
introduce a post chromating step, frequently some kind of sealer.
This gives the parts better salt spray resistance. These sealers are
rarely if ever applied to hex chromated parts. That might be the
difference.
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Dave Wichern
- The Bronx, New York
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