Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers


Epoxy Zinc Phosphate

Last updated: November 7, 2019

What Does Epoxy Zinc Phosphate Mean?

Epoxy zinc phosphate is used to produce epoxy primers and sealers that have a non-porous finish. They are primarily recommended as the first base coat over bare steel. These base coats or epoxy primers are also used over fiberglass, plastic or a black iron phosphate coating.

An epoxy zinc phosphate primer can also be used on cracks and dents. Its bonding capacity is excellent and produces a good surface finish. Epoxy primers not only offer excellent adhesion to metals, but also serve as a proper base for subsequent undercoat products and topcoats or paint.


Corrosionpedia Explains Epoxy Zinc Phosphate

Epoxy zinc phosphate primers contain zinc phosphate, which acts as a corrosion-inhibiting pigment. Epoxy primers are used to waterproof materials that consequently protect the bare metal from oxidation.

A dry, very clean surface is needed before applying an epoxy primer. Two-part epoxy primers must be mixed thoroughly before applying.

Since paints in the automotive and marine industries must resist corrosion (rusting), epoxy coatings are widely used as primers to improve the adhesion of the metal surface. Epoxy primers are also used in structural steel coatings for high-build thickness with the application of only one or two coats.

A two-part epoxy primer is also known as structural steel primer. It consists of two components that are cured chemically through cross-linking. This two-part epoxy primer produces a film that is resistant to abrasion, chemicals and moisture. It is very suitable for use on properly prepared steel and concrete. This primer is also recommended for power plants, marine applications, water treatment plants and tank exteriors.


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