There are so many phosphates to pick in metal finishing. Why iron phosphate?

Cleaning the Hard to Clean

Our Application Specialist, Connor Callais breaks it down for you.

Look at what our Application Specialist, Connor Callais had to say recently showcased in the Hubbard-Hall Seen & Solved podcast.

Connor Callais: Application Specialist Hubbard-Hall

Tim Pennington:
Why would someone choose to use iron phosphates? What are some of the advantages for their process?

Connor Callais:
When you are looking at phosphating as a whole, magnesium and zinc phosphate applications can give you a variety of mechanical benefits, but what you really need out of this coating is the appropriate paint adhesion. If you’re going to coat a part and painting over it shortly thereafter, you don’t need some of those other properties that those more conventional methods provide.

When you look at iron phosphate, it allows you to get the adhesion on the surface of the bare metal that you want. Iron phosphate will help the paint to adhere properly and have those robust properties out in the field, but does so in a simpler method. While you can spray some of the zinc phosphate chemistries, typically, those zinc and magnesium processes tend to be done as an application that uses an immersion, whereas iron phosphates, you can easily combine those and utilize them in both an immersion process and a spray process. That process can be done very easily in a continuous line, where you go from your pretreatment and continue a conveyor immediately into a paint booth, which allows you to maintain that process in a more automated manner. These chemistries are simpler in terms of their use. You don’t have all different factors that you have to worry about. So, they have a lot of advantages in terms of when you’re having an applicator or just needing paint adhesions, or pre-paint characteristics.


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