Pretreatments
Powder on Tri-Chrome Treatment
We have been coating aluminum alloys for some time with inconsistent field performance of the coating. Following your advice,we are now having a tri-chrome pretreatment process being done at a local vendor on all of our aluminum castings. So far our performance is excellent, but we are seeing failures in testing on a new product in A413 alloy. Our casting vendor tells us A380 would be much more suitable. Do you see any issues in powder coating this alloy now that we are doing the tri-chrome pretreatment process?
Read MoreAsk The Expert: Powder on Tri-Chrome Treatment
Q. Do you see any issues in powder coating A413 alloy now that we are doing the tri-chrome pretreatment process?
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Ask The Expert: Corrosion Under Powder Coating
Q. We’re 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. Is there a solution, or should we switch to another process?
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PPG Chromate-Free Primer, Pretreatment on Boeing Next-Generation 737, and VIDEO
A chromate-free metal pretreatment and an exterior decorative primer are now standard on Boeing Next-Generation 737 production airplanes. Watch video of the 737 being built in 3 minutes!
WatchCorrosion 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 our job shop. Our product is an acoustic enclosure of a diesel generator set, so we are using polyester powder for sun resistance. Is there a solution, or should we switch to another process?
Read MoreTroubleshooting the Pretreatment and Paint Process
We had finished parts sectioned, mounted, polished and examined under a microscope with the hopes of identifying deficiencies within our coating system that cause premature failure. One of the items brought up are oxides trapped within scratches and scale texture under the e-coat. The substrate is hot-rolled-steel (recycled steel) bar that has been steel shot blasted then put through the standard cleaning process prior to e-coating. Have you ever heard of or seen steel shot blasting driving oxides into small crevices or texturing natural to hot-rolled steel? We cannot seem to figure out why these oxides are still present after shot blast and pickling.
Read MoreASK AN EXPERT: Corrision Resistance
Q. What should we change to enhance our salt spray results?
Read MoreOptions for Outdoors
We want to provide more powder coated products for outdoor use, but we do not want to get into zinc phosphate or chrome. Can we achieve good results on steel parts if we use a primer, and if so, how do we need to process the parts?
Read MoreWhy Use Epoxy Primer?
We have been applying a two-package epoxy primer and then a polyurethane topcoat to our products.
Read MoreProtecting 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?
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