Conversion Coating For Powder
Have you found or know of an alternative to the Alodine that would give good adhesion and good Florida exposure.
Share
Q. We use Alodine on 5053 aluminum and use a water based coating. We want to change to powder but we are also having to meet the RoHS requirement that does not allow hexavalent chrome in the Alodine. Have you found or know of an alternative to the Alodine that would give good adhesion and good Florida exposure. J.D.
A. Alodine is a registered trademark of Henkel Surface Technologies. It is known generically as a chromate conversion coating pretreatment used on aluminum products. Henkel and other chemical suppliers provide this conversion technology in non-chrome formulas. Additionally, there are several companies that offer “nano-technology” pretreatments that work on aluminum substrates that have proven to be as affective as chromate conversion coatings, but without the chrome. I recommend contacting these chemical suppliers and have them review your current method of application, process limitations, and corrosion requirements before selecting an alternative pretreatment. Remember always confirm your design by testing before you commit to the new technology.
RELATED CONTENT
-
Masking for Surface Finishing
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
-
Touch-up Options for Powder Coated Parts
Is it true that powder coating cannot be touched up? Powder coating expert Rodger Talbert offers options for powder coating touch-ups.
-
Calculating the Cost of Powder Coating
How can you calculate the cost of powder coating a component if you only know its surface area? Powder coating expert Rodger Talbert has the answer.
