Looking for Common RoHS Compliant Base Coating for Cast A360.0
Looking for Common RoHS Compliant Base Coating for Cast A360.0
(OP)
Currently we polyester powder coat our cast products that are made of A360.0. These are typically housings for electronics, with an outdoor rated service life of 7-10 years (96hr salt spray). We are investigating some form of "base coat" that will cover the entire part for corrosion purposes and allow us to powder coat only the exterior surfaces for customer requirements. I am only familiar with anodizing (AMS 2471 and 2472), and chromating (AMS-C-5541). I have found a RoHS compliant specification for a chemical film, MIL-DTL-5541, Type 2 (hex free chromate).
My question is if this is the most commonly sourced RoHS compliant coating for corrosion resistance, or is there something else available out there that I haven't come across yet? Any information and discussion is greatly appreciated.
My question is if this is the most commonly sourced RoHS compliant coating for corrosion resistance, or is there something else available out there that I haven't come across yet? Any information and discussion is greatly appreciated.
"Art without engineering is dreaming; Engineering without art is calculating."
Have you read FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies to make the best use of these Forums?





RE: Looking for Common RoHS Compliant Base Coating for Cast A360.0
RE: Looking for Common RoHS Compliant Base Coating for Cast A360.0
I have been calling up CHEMICAL FILM ROHS COMPLIANT.
The chemical films are equivalent to MIL-5541, but they do not contain hexavalent chromium.
--
JHG
RE: Looking for Common RoHS Compliant Base Coating for Cast A360.0
"Art without engineering is dreaming; Engineering without art is calculating."
Have you read FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies to make the best use of these Forums?
RE: Looking for Common RoHS Compliant Base Coating for Cast A360.0
RE: Looking for Common RoHS Compliant Base Coating for Cast A360.0
"FINISH: CHEMICAL CONVERSION COATING PER MIL-DTL-5541F TYPE II CLASS 3 (CLEAR)."
It's been a while since I read the std but as I recall this note calls out the ROHS compliant [type II] 'thin' (low resistance) [class 3) 'flavor'.
I'm guessing you'll want class 1A if you choose to reference this std.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?