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Citric Acid Passivation
I would like to set up a citric acid passivation line as follows: heated citric, drag-out tank, three cascading unheated rinse tanks and possibly a heated rinse to help in drying. Am I missing any tanks and or accessories that you would recommend?
Ask an Expert Published: 9/26/2012
Copper Sulfate Test for Passivated Parts
Why is the copper sulfate test a common test to know if the passivation process is in good quality?
Ask an Expert Published: 9/25/2012
Stainless Steel Streaking After Passivation
After passivating 347 stainless steel per AMS700 Type VI there is a stain pattern. On inspection at 10x magnification, I see that the surface is pitted. Process steps are alkaline degrease at 140°F, two rinses, final rinse in reverse osmosis water, ...
Ask an Expert Published: 9/24/2012
Cleaning Galvanized Steel
How do you clean white lime scale and rust spots on galvanize?
Ask an Expert Published: 8/7/2012
Powder Coating Pretreatment
How do you recommend we clean a paraffin wax die lube from a cast aluminum substrate?
Ask an Expert Published: 6/1/2012
Oxsilan Pretreatment Revisited
In my August 2011 column, I responded to a question regarding the benefits of Chemetall’s Oxsilan pretreatment process versus more conventional iron and zinc phosphate pretreatments. Chemetall product manager Gary Nelson has provided further informa...
Ask an Expert Published: 5/31/2012
Pretreatment of Carbon Composites
Is there a type of chemical bath or similar option that carbon composites can be processed through to improve paint adhesion?
Ask an Expert Published: 5/30/2012
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

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