Phosphate Coating
Phosphate coating improves the corrosion resistance and adhesion for primers and top coats, prolonging the service life for parts and components Contact us to discuss your project and request a quote.
Phosphate Coating Overview
What is Phosphate Coating and how does it work?
Phosphate Coating is a chemical surface treatment process (often applied after sandblasting) that involves a chemical reaction between a metal surface and a phosphate solution, creating a thin, crystalline layer that bonds to the substrate. In addition to improving corrosion resistance, the crystalline layer accentuates surface topography, enhancing the mechanical bond to protective coatings.
Where is Phosphate Coating used?
Phosphate coating is commonly specified as a pre-treatment for Moly Coating, Teflon Coating, and Industrial Painting systems on fasteners, valves, and machined components where maximum coating adhesion is critical, particularly in high-load, high-wear, or chemically aggressive service environments.
Which substrate materials can be Phosphate-Coated?
CCI specializes in zinc phosphate coating, which has a wide range of applications and works well on many ferrous substrates (carbon steel, cast iron, & more) and some non-ferrous substrates (zinc, aluminum).
Why choose Custom Coatings International?
In industries where coating failures can drive excessive repair and maintenance costs, choosing an experienced, proven applicator is critical. With over 30 years of experience applying protective coatings and references including Baker Hughes, CCI has earned a reputation for delivering high-quality coating finishes on time and to specification. Contact us to request a quote or discuss your application.
Benefits of Zinc Phosphate Coating
There are three main types of phosphate coatings: zinc, manganese, and iron. Custom Coatings International specializes in zinc phosphate coating, regarded as the “workhorse” among phosphate treatments. It offers superior corrosion resistance and paint durability compared to other options. Below are the key benefits of zinc phosphate.
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Superior Corrosion Resistance
Forms a dense, crystalline structure that provides excellent barrier protection.
Performs especially well when combined with paint, powder coat, or oil post-treatment.
Outperforms iron phosphate significantly in salt spray/humidity tests.
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Excellent Paint/Coating Adhesion
Creates a rough, crystalline surface that dramatically improves the adhesion for paints and powder coatings.
Reduces underfilm creep if corrosion starts at a scratch or edge.
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Versatile Application Range
Works on many ferrous substrates (carbon steel, cast iron) and some non-ferrous (zinc, aluminum).
Suitable for both decorative (pre-paint) and functional (wear/corrosion) purposes.
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Balanced Performance
Compared to manganese phosphate (which is better for wear), zinc phosphate offers a better blend of corrosion resistance + adhesion rather than just lubricity, making it one of the most versatile phosphate coatings.
Typical Applications of Zinc Phosphate Coating
Industrial Equipment
Heavy machinery, agricultural equipment, construction equipment, and parts are exposed to moisture and wear.
Oil & Gas Industry
Oil and gas completion equipment (tubing, couplings, downhole tools), Valves, pumps, and flanges are exposed to corrosive environments.
Aerospace & Defense
Aircraft structural steel components requiring corrosion resistance.
Fasteners & Hardware
Bolts, nuts, screws, and threaded parts where both corrosion resistance and paint adhesion are required.
Automotive Industry
Pretreatment for car bodies prior to painting (improved corrosion protection), Engine components, fasteners, and brackets.
Why Work with Custom Coatings International?
With over 35 years of sandblasting and coating experience, Custom Coatings International has been a trusted partner to some of North America's largest oil and gas companies. Our decades of expertise mean customers can expect coatings that perform longer, reduce maintenance costs, and minimize downtime. By combining precision with consistent quality, we deliver reliable protection that helps our clients keep their operations running smoothly and efficiently.
Let’s Discuss Your Project
Need help finding the right solution? Contact us below or fill out the contact form, and the appropriate customer service specialist will contact you.
Zinc Phosphate Coatings FAQs
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Our zinc phosphate bath has a tray size of 4 feet in length and 1.5 in width, allowing us to work with a variety of different parts and components of different sizes.
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Zinc phosphate is a type of conversion coating that’s applied to variety of compatible metals to improve corrosion resistance and adhesion for paint. It’s one of the most widely used phosphate coatings in industry, especially in automotive, appliances, and construction steel.
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You can zinc phosphate without abrasive blasting first, but it is not recommended if the intention for the metal is for coating adhesion. Sandblasting/ abrasive blasting is premier option in surface pre-treatment and phosphating is an additional treatment on top to better ensure adhesion of paints and coatings.
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In our shop in Leduc, Alberta, Canada, we receive numerous amounts of zinc phosphating jobs, with common paint coats being Molybdenum Disulfide Coatings, polymer Teflon coatings, Industrial paint coatings, and powder coatings.