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Exploring the: Painting Quality Control Zone
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- Phosphatizing Powdered Metal Parts
- My company makes powdered metal parts that are pressed to shape from metal powders to a density of 6.0 to 6.5 g/cc. The parts are then manganese-phosphate coated, and the phosphate coating does not always have a dark, even appearance, but is mottled...
Ask an Expert Published: 1/5/2012
- Painting Iron Castings
- We are having paint adhesion failures on the centrifuges’ rotating hub, which is made of iron. Our customers have been complaining that after a couple of weeks of operation, the paint peels off the hubs and then rust takes over. What can we do to co...
Ask an Expert Published: 1/4/2012
- Intercoat Adhesion
- Q. I am a manufacturing engineer in a plant that produces small appliances. We are having trouble with a baking enamel. When a part is rejected because of a paint defect, we try to recoat it, but the second coat won’t adhere to the first, causing us...
Ask an Expert Published: 12/14/2011
- Shaken, Not Stirred
- We are an American corporation with operations in India. For one of our applications, we use an epoxy primer (BMS 10-11Y, type I, class A, grade E, water-reducible epoxy primer, green 44-GN-011). Can you please clarify if our product is suitable for...
Ask an Expert Published: 11/23/2011
- Color Variation by Spraying
- e a two-part polyurethane finish system consisting of a primer and a white base coat on a conveyorized painting line. I am seeing shade variation in areas coated with the white paint. What should I do to correct the color difference problem?
Ask an Expert Published: 10/25/2011
- Adhesion to Aluminum
- Our problem is poor adhesion (paint flaking) around the sheared areas and punched holes.
Ask an Expert Published: 9/22/2011
- Pinholes in Paint Film
- What is the cause of pinholes in our solvent-based paints, and what steps can we take to eliminate this problem?
Ask an Expert Published: 8/26/2011
- Flash Rusting
- Our problem is that right after the acid pickle, the tanks flash rust severely before we can get them into the zinc phosphate solution.
Ask an Expert Published: 6/1/2011
- Paint Adhesion
- Last year at this time we had a large amount of scrap due to paint adhesion failures. Our procedure for metal pretreatment was dip in alkaline cleaner, rinse in cold water and dip in a non-chromate final rinse. To solve this problem, I investigated ...
Ask an Expert Published: 6/1/2011
- Painting Aluminum Tubes
- In our product line we have an aluminum tube being used as an extension for a carbon mast. We have been painting this tube with white paint, but are having problems with the paint’s durability, as it is chipping.
Ask an Expert Published: 6/1/2011