CORROSION PROTECTION OF LOW TOXICITY PAINTS

In this paper the anti-corrosive behaviour of four low toxicity painti ng systems is presented; two are water-borne coatings (acrylic and epo xy) and the other two are powder coatings (epoxy and polyester). Field exposure, total immersion and accelerated aging laboratory tests were performed. The main aging features of each coating were evaluated by comparison with an organic solvent soluble epoxy primer/aliphatic poly urethane top coat painting system. It was seen that some classical lab oratory procedures are not useful for some low toxicity painting syste ms. Impedance measurements pointed out aspects concerning differences in the deterioration mechanisms of some coatings under testing conditi ons. A discussion about corrosion processes in painted samples which a re not detected by the impedance is also presented. (C) 1997 Elsevier Science S.A.