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Pretreatment and powder coating for construction machines

Dear Sirs,
I would like to know the most suitable bath sequence for pretreatment of construction machine parts (excavators, backhoe loaders). Should we think of a dipping system, or spray washing?
Secondly, we are targeting to reach at leat 850-900 hours of salt spray resistance. Do we need to consider primer coating before powder top coating?

Thanks,

Emrah ALTIN
Marketing Manager - Ankara, Turkey
January 29, 2008

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There is rarely a "right" answer because you must decide how much you are willing to spend. But for an industrial product like this I think shortcuts are out of order. I think you need a full zinc phosphate process followed by e-coating before powder coating. And some of your sheet metal could perhaps be galvanneal.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
January 29, 2008

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Pretreatment isn't your only worry, some of the big heavy parts could spend hours in the oven in order to cure properly.

Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina
January 30, 2008