Powder Coating
Powder coating is a process where electrostatically charged powder paint is sprayed onto metal parts and thermally cured. This creates a sealed, mechanically robust, and corrosion-resistant barrier.
Physicochemical mechanism of action
Powder coating uses electrostatically charged powder that is attracted to the metal parts. After the coating is sprayed, it is baked in by thermal processing (often in an oven) and bonds with the metal. This forms a dense, homogeneous coating.
Metallurgical relevance & welding risks
Powder coating protects the metal from corrosion and increases its mechanical properties such as hardness and stress relief. However, the coating process can cause difficulties in weldability because it restricts the diffusion of metal ions. This can lead to uneven deformation or weak points if not handled correctly.
Shop practice & instructions
Before welding the metal, the powder coating must be removed. This is done using chemical removers or mechanical methods like sandblasting. It is important that the coating is completely and evenly removed to ensure no corrosion damage occurs. The weld seam should then be treated the same as the uncoated metal.