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Chrome Pretreatment
What are effective pretreatments before painting over chrome?
Ask an Expert Published: 6/6/2014
Pretreatment Duration
How can I shorten the pretreatment time for my batch powder painting operation?
Ask an Expert Published: 6/4/2014
Conversion Coating Questions
Reader looks for information on conversion coatings and processes.
Ask an Expert Published: 5/26/2014
Zinc Phosphate of Brazed Steel Parts
What is causing etching of tungsten carbide and copper alloy braze materials after zinc phosphating?
Ask an Expert Published: 5/21/2014
Passivation Concentration
I am reviewing my passivation process with nitric acid per ASTM 967 using nitric 2 (6.1.1.2), 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

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