Differences between epoxy zinc phosphate primer and epoxy zinc rich primer

What is the same between epoxy zinc phosphate primer and epoxy zinc rich primer is that they belong to the epoxy primer of epoxy resin paint, both of which have anti-corrosion and antirust effects, tough paint film, strong adhesion, alkali resistance, moisture resistance, solvent resistance and other characteristics. So you know them? The following is a small compilation of Kuncai Chemical to share how to distinguish.

1. Different antirust pigments lead to different antirust capabilities

The epoxy zinc rich primer mainly uses zinc powder as the main antirust pigment, and the zinc powder content is 60% - 80%. Therefore, the epoxy zinc rich primer has triple antirust capabilities of cathodic protection, corrosion inhibition and shielding. The zinc powder is corroded before the steel, producing complex, which plays the role of shielding and corrosion inhibition, and protects the steel from rust.

Epoxy zinc phosphate primer mainly uses zinc phosphate as the main antirust pigment. The antirust principle of zinc phosphate is that the adhesion and corrosion inhibition complex formed by hydrolysis reaction can phosphatize the surface of metal substrate, form a particularly effective protective layer within the anode range, play a good corrosion inhibition and shielding effect, and isolate the corrosion medium.

2. Different surface treatments:

The treatment of epoxy zinc rich primer substrate is relatively strict, and the sand blasting must reach the Swedish derusting grade standard Sa2.5 or above.

The requirements for the substrate treatment of epoxy zinc phosphate primer are slightly lower. It is only necessary to clean the substrate to ensure that there is no rust, oxide skin, oil stain, etc.

3. Different application fields

Epoxy zinc rich primer is a supporting primer for heavy anti-corrosion coating, which is suitable for anti-corrosion coating of steel structures under atmospheric environment, especially under relatively harsh conditions, such as: storage tanks, containers, steel structures, steel pipes, offshore platforms, ships, harbor facilities and undercoats in harsh anti-corrosion environment.

Epoxy zinc phosphate primer is applicable to steel structures, pipelines, storage tanks, mechanical equipment, etc., providing good adhesion and corrosion resistance for the substrate, and can also be used for anti-corrosion coating in chemical plants, fertilizer plants, power plants, refineries, paper mills, sewage treatment plants, etc.

4. Different supporting schemes:

Epoxy zinc rich primer is generally used together with intermediate paint and finish paint. Common supporting schemes:

(1) Epoxy zinc rich primer+epoxy micaceous iron intermediate paint+acrylic polyurethane finish

(2) Epoxy zinc rich primer+epoxy micaceous iron intermediate+fluorocarbon finish/polysiloxane finish

Epoxy zinc phosphate primer is generally used directly with the top coat, and the common supporting scheme is:

(1) Epoxy zinc phosphate primer+epoxy finish

(2) Epoxy zinc phosphate primer+acrylic polyurethane finish

Epoxy zinc phosphate primer and epoxy zinc rich primer have different primer advantages. The specific application depends on the construction environment and the degree of anti-corrosion required. It is necessary to select the appropriate primer