Environmental influences on the abrasion resistance of a coil coating system

The protective properties of organic coatings against corrosion in coil coating systems, require good protection from abrasion and the chemical environment. In addition, mechanical damage and aggressive solutions can locally reduce the protective properties of paints.In this paper, a slurry made of abrasive sand and aqueous solution containing different ions at different pH or organic solvents was used.The evaluation of abrasion damage produced by artificial sand, made of Al2O3, on organic coil coatings, was conducted using electrochemical measurements and a modified Taber test apparatus. The damage caused by abrasive sands and the reduction in protective properties is strongly dependent on characteristics of the solutions (aqueous or organic). In particular, the influence of organic solvent (N-vinyl-2-pyrrolidone) was high on the organic matrix of paint. Cracks and loss of protective properties were observed with the use of alcohol. Cracks and holes were noticeable with the use of ketones.