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Passivation Concentration
I am reviewing my passivation process with nitric acid per ASTM 967 using nitric 2 (, and am not sure how to mix or check the solution. I also want to be sure I am neutralizing correctly.
Ask an Expert Published: 10/1/2013
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

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