The PPA 571 coating protect metal fencing from corrosion for 15 years

Why Phosphatize During Pretreatment?

Posted on: June 12th, 2014 by byersbushblog

Anyone who knows even the slightest bit about powder coating will know that spending sufficient time and effort on pretreatment is not a false economy.

A perfectly prepared surface will not only maximize the lifespan of a powder coated finish, but will also produce more visually pleasing results.

Phosphatizing prior to applying the powder can have two major benefits: it can actually improve the level of adherence that the coat has to the surface, and can make the surface itself more resistant to corrosion.

How to choose the right phosphate process

Selecting the right phosphate process will depend on a number of factors, including:

  • The material of the part you plan to coat
  • Your budget
  • The proposed environment of the part, and the resistant factors it will thus require

All phosphatizing materials come with their own set of pros and cons. For example, iron is affordable and versatile, while zinc is expensive, but often more resilient. Chrome, on the other hand, is the most complex to apply, but is best suited to aluminium surfaces.

How does phosphatizing work?

Phosphatizing takes its base material and uses an acidic solution to alter its surface, and lightly coat it with one of the previously mentioned metals.

What are the benefits?

After phosphatizing a material, the surface is rendered microscopically rough, so that finishing coats can stick to it better.

Untreated metal parts will have numerous faults that allow negative and positive charges to coexist among one another.

This can be caused by numerous things, including a high carbon concentration in the base material or a moisture presence, which can affect oxygen levels and cause galvanic corrosion, much like what often happens to common batteries.

Phosphatizing will seal these charged areas off from one another, which can substantially reduce the risk of future corrosion.

The best phosphatizing pretreatments will leave the surface slightly rough, so as to increase its overall surface area, resulting in a better adhesion rate for the final powder coating, because it offers small areas for the powder coat to embed itself into.

An adequate phosphatizing pretreatment will prime a surface for powder coating, increasing the quality of the final coat, and future proofing it for resilience.

If you’d like to learn more about phosphatizing pretreatments for powder coating in the Ontario area, then contact Byers Bush Powder Coating Inc.

We have been providing powder coating and sandblasting services in Toronto, Concord, Hamilton, Brampton, Oakville, Ontario for more than 40 years.

We are known for providing high-quality finishes and doing so with a quick turnaround time and excellent customer service.

Our experienced and qualified team has the expertise that you need in order to achieve a perfect powder coated finish.

Before we coat your item, our team will inspect it. They will check the condition of the item, and decide what needs to be done to prepare the item for powder coating.

To find out more about our services, call Byers Bush Powder Coating Inc. at or contact us at 905-625-4334.

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