Exploring the: Pretreatments Zone

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Multi-Metal Pretreatment

I need to clean steel, aluminum and steel castings, steel forgings, electrogalvanized and galvanneal sheet, and aluminum sheet metal parts for an e-coat application. Presently, we use Parco 305 (Henkel), but results are variable. The finish on the g...
Ask an Expert Published: 3/22/2012

Corrosion Under Powder Coating

We’re facing problems in powder coating on sheets of cold-rolled closed annealed parts. We found that, after some days, the color is peeling off, and we have found corrosion beneath that. We do a three-in-one cleaning process and then powder coat at...
Ask an Expert Published: 2/21/2012

Troubleshooting the Pretreatment and Paint Process

We had finished parts sectioned, mounted, polished and examined under a microscope with the hopes of identifying deficiencies within our coating system that cause premature failure. One of the items brought up are oxides trapped within scratches and...
Ask an Expert Published: 2/21/2012

Tanks for Citric Acid Passivation

We want to change over to citric acid bath passivation. Can we use the same tanks that we use with nitric acid?
Ask an Expert Published: 12/13/2011

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