We manufacture coated pipe products, and I’ve been asked to come up with a guaranteed lifetime period for a “Single Wall Steel Tube” pipe having a coating that is 25 microns thick. The coating withstood the CASS test for 60 hrs. How many years it will with stand up in the field?
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?
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. This has been attributed to the high copper content of the powdered metal parts. What do you think?
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 correct this problem?
Can you suggest a) a paint that is ductile-plastic-friendly, b) a surface treatment that may later be painted or c) another flexible, abrasion-resistant coating for this purpose that won’t weaken the plastic?
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 problems. What is the best type of polymer for a baking enamel that allows it to be recoated with excellent adhesion?
Q. Let me suggest another alternative to your suggestions for treating the piece of steel from the World Trade Center, described in the September issue.