Coating performance begins before the first layer of paint is applied. Rust, mill scale, old coatings and embedded contaminants prevent a new coating from making consistent contact with the base metal. Shot blasting removes these weak boundary layers and prepares a clean, textured surface for the coating system.
Cleaning and profiling in one process
High-velocity abrasive strikes the workpiece and removes surface contamination while creating a controlled anchor profile. This profile increases the effective surface area and gives primers and protective coatings a mechanical key. With suitable abrasive, wheel settings and line speed, the process can produce repeatable surface cleanliness and roughness across a production batch.
Process variables that matter
- Abrasive type and size: influence cleaning speed and the shape of the surface profile.
- Blast intensity and coverage: must match the material, geometry and coating specification.
- Workpiece handling: should expose every critical surface without causing collision or deformation.
- Dust and abrasive separation: help keep the process stable and prevent contamination from returning to the surface.
The prepared workpiece should be inspected and coated within the specified time window to limit flash rust. Dingtian engineers shot-blasting and pretreatment systems around the required workpiece size, throughput, surface standard and downstream coating process.