Epoxy zinc-rich primers offer excellent corrosion resistance, water resistance, and adhesion. However, sometimes after application, the coating can develop mottled rust spots. What causes this?
If rust, acid, salt, or moisture on the substrate is not thoroughly removed before applying the epoxy zinc-rich primer, it can worsen the substrate’s corrosion.
If the coating has pinholes, missed spots, or small cracks that haven’t been filled, these exposed areas can be easily corroded when exposed to air.
If the epoxy zinc-rich primer is applied too thinly, moisture or corrosive gases can penetrate the film and corrode the substrate.
In environments with high humidity, a layer of condensation can form on the substrate surface, which can lead to rusting when the epoxy zinc-rich primer is applied.
Before applying the epoxy zinc-rich primer, ensure that the surface is thoroughly prepared. Sandblasting and phosphating may be necessary.
Ensure comprehensive application of the primer, especially in weld seams and corners, to guarantee the integrity of the coating.
Strictly adhere to the coating process and do not change the film thickness arbitrarily.
Do not apply the coating when the air humidity exceeds 85%.
In summary, rusting of epoxy zinc-rich primers primarily results from inadequate application. Therefore, it is essential to strictly follow technical specifications during application to avoid unnecessary losses.
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