Small areas can be cleaned with a stainless steel wire brush, disc grinder, flap wheel or other abrasive. Other methods of preparing stainless steel for painting It is advisable to passivate the stainless surface with nitric acid after blasting to remove any possible carbon steel contamination and ensure optimum corrosion resistance. Suitable blasting media are washed silica sand, stainless steel shot, glass beads. Blasting media must be clean, free from metallic iron, not previously used on carbon steel and free from chlorides. This method of cleaning is particularly useful for large structures and is highly effective in removing mill scale. Thorough rinsing after pickling is essential. Consult Austral Wright Metals for details. Mill scale on HRA and welding or heat treatment heat tints can be removed by pickling with pickling paste, or by immersion in a mixture of nitric and hydrofluoric acids. Also do not use steel wool during preparation as this is typical made of carbon steel which can leave residues causing rusting on the surface of the stainless steel surface. The recommendations of the paint manufacturer should be followed. The cleaning required depends on the intended application as well as the coating system to be used. How To Prepare Stainless Steel for PaintingĬleaning is usually carried out after welding or fabrication, including removing heat tint from welds. The preparation required will depend on the surface finish of the stainless steel. Surface preparation prior to paint a stainless steel surface is as important as it is for carbon steel. Painting may actually reduce the corrosion resistance, but may be required for other reasons such as product marking or identification, or for the protection of carbon steel welded to it. Stainless steels have an aesthetically pleasing appearance, and can be further polished or painted to enhance this feature.
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