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Solvent Cleaning Parts
Our company makes packaging machines, and I am the quality control engineer responsible for all finishing operations. We paint castings, sheet metal guards and machined parts. We are presently solvent-cleaning in two dip tanks prior to painting. We ...
Ask an Expert Published: 3/28/2012
Why Use Epoxy Primer?
We have been applying a two-package epoxy primer and then a polyurethane topcoat to our products.
Ask an Expert Published: 2/1/2012
Protecting Brass
I have had customer complaints about the clear coat peeling and corrosion problems on solid-brass numerals for house identification. Can you give any tips on how to polish the brass and protect it for years to come?
Ask an Expert Published: 2/1/2012
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
Adhesion to Zinc
We tried washing the part with an iron phosphate wash, and it helped some, but we still did not get 100-percent adhesion. Can anything be done to the part to get the topcoat to adhere?
Ask an Expert Published: 10/25/2011
Steam Cleaning/Phosphating
We have been getting field complaints that the paint is peeling off in certain areas even before shipping. Apparently, this is because of insufficient degreasing and phosphating with the manually operated steam cleaner.
Ask an Expert Published: 9/22/2011
Phosphate Bleed Through
All of a sudden we began having problems with the appearance of our coated products. The irregularities in the phosphate coating are telegraphing or bleeding through the paint when the high-solids coating is applied.
Ask an Expert Published: 8/26/2011
World Trade Center I-Beam Preservation
I have been asked to make an honorable artistic memorial for exhibition on the 10th anniversary of the tragedy. For the memorial, a section of the I-beam will be publicly displayed inside an airport, and it may be an open display able to be touched...
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

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