Surface Preparation Before Powder Coating: Why It Decides Coating Life

More coating failures trace back to poor surface preparation than to the coating itself. Proper pretreatment is non-negotiable.

Cleaning Stages

Alkaline degreasing removes oils and drawing compounds, followed by rinsing and conversion coating to improve adhesion and corrosion resistance.

Masking and Grounding

High-temperature masks protect threads and sealing surfaces. Reliable grounding contact ensures uniform electrostatic deposition.

Curing Control

Oven temperature and time must match coating specifications; under-cured coatings chip easily, over-cured coatings discolor.