Ask Joe

06
I work for a powder manufacturer and have
a question about PSD (particle size distribution)
and our particle size analyzer. My first
question is what causes fines and how do we fix
it? My second question is on our particle size
analyzer. We have the air pressure to 1500 mb.
Is that a high number and will it cause to break
our particles and create more fines?

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11

Q: Very recently I graduated in Materials Engineering and I am naive about coating issues. Is there any handbook (available online) to follow to improve my knowledge on this?
Mugni, Bangladesh Univ. of Eng. and Tech.

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Posted in: Ask Joe
25

My column is meant to be informative, hopefully a little entertaining, and occasionally provocative. You, the readers, are a bright bunch of people and I always appreciate your input and feedback. In the September/October issue I offered my perspective on galvanizing plus topcoat vs. zinc primer/topcoat. I was heartened to receive a very cogent reply from a gentleman who faces this issue on a daily basis. His analysis is excellent and hence I am sharing it with you.

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Posted in: Ask Joe
22

It’s Allison from Boise. So we have been doing some experimenting since the last PCI meeting. Rob has powder coated his leather boots and wood handles on our wheelbarrow. That all being said, I had a customer inquiring on powder coating a porcelain toilet PINK. Is that possible? Pre heat and shoot hot? Or just stay away from the test altogether? Thanks for your insight!

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15
Masking Our Peelings Q. Hi Joe, I live in Huntington Beach and would like to have my oven knobs painted red. But I want to keep the lettering (temp,...

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Posted in: Ask Joe
01
Don't Gloss Over The Problem Q-Dear Joe, Hope you are fine. My customers get surface problems such as gloss reduction and haze (regional) curing with...

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07
Q Dear Joe, We powder coat in house and have a 5 stage washer of which 1 stage is a phosphoric acid bath. Do we have to have iron phosphate to get g...

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07
Q Hi Joe, What makes one powder fluidize better than another? Jason S., Denver, PA. A Dear Jason, This is an excellent question. To make a powde...

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Posted in: Ask Joe
07
Why Are We Falling Flat? Q Hey Joe, Why are we seeing random flat spots in a textured powder after the metal has been washed? Aaron K, Decatur, Il...

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04

Dear Joe,

Can a standard iron phosphate pretreatment be used as a corrosion inhibitor for steel? That is, can I process my parts with iron phosphate at one location and then ship them to another location for powder coating? The parts are made in Asia and the coating process is in the United States.

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