Pretreatments

Exploring the: Pretreatments Zone

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Published: 7/25/2017

How to Identify Substrate or Paint Defect
Q. Over the past several years we have had a coating defect anomaly randomly show up on painted parts...Cleaning expert David S. Peterson takes a close look at cleaning processes to identify the root cause. 

Published: 6/1/2017

How to Use Pretreatment to Improve Salt Spray Hours
Q. Our goal is to have our gas regulators pass ASTM B117 for 500 hours. We use an epoxy powder coat; parts are treated with zinc phosphate first, then powder coated. We are seeing the internal parts of the castings rusting prematurely. Which spec co...

Published: 6/1/2017

How to Strip Zinc Phosphate Without Using Chromic Acid
Q. I want to remove zinc phosphate from hardware parts after cold heading. Typically to remove zinc phosphate, I would soak in chromic acid at a high temperature, but this is not a viable or safe method for bulk treatment. Can I just hit the parts w...

Published: 4/1/2017

How to Stop Outgassing with Die-Cast Parts
Q. We run aluminum extrusions using a chrome treatment conversion coating. We began running aluminum die-cast parts and are seeing small blisters and holes in the coating. How can we stop this?

Published: 3/1/2017

Can Aqueous Alkaline Cleaner Be Used on Aluminum?
Q. Should I not use the same bath to process aluminum and stainless steel? Can aqueous alkaline cleaner be used on aluminum?

Published: 1/1/2017

How to Improve Liquid Corrosion Resistance
Q. How can we improve the desired corrosion resistance expected from our coating?

Published: 1/1/2017

Liquid Coatings Clinic: Correcting Liquid Adhesion Issues
Q. I cannot get the desired adhesion of my coating to my part. What should I look for to fix this problem?

Published: 1/1/2017

How to Stop Rust
Q. We make automated pay stations for parking lots, the machines that allow the customer to pay at the exit with a credit card or cash. We have had some problems with rust breaking out of the seams at the base and around the door panels that provide...

Published: 1/1/2017

Corrosion-Sensitive Environment
Q. I have some fencing around my swimming pool that has corroded badly over the years. It was made with steel and there is a lot of visible rust on the rails and vertical pickets. I am considering the options; have a professional painter come in and...

Published: 1/1/2017

Powder Coating Clinic: Adhesion Problems on Chromated Zinc Plating
Q. We have had adhesion issues when powder coating over zinc-plated aluminum. The aluminum had been nickel-flashed and zinc-plated with a hex-free chromate to meet RoHS compliance. Do you have any suggestions as to why the powder will not adhere pro...