Anticorrosive performance of repair painting as remedy for deterioration in metallised steel

Abstract

When the various metallic coating systems applied on steel bridges deteriorated, they may need to be repaired by painting because onsite metallic recoating is very difficult. In order to examine the performance of repaired painting on steel plates with the remains of four types of deteriorated metallic coating systems, cyclic corrosion tests were performed in combination with exposure to an acid rain spray. It was found that a residual coating of zinc hot dip galvanising acted as a helpful substrate for the repair painting. Residual coatings of a zinc–aluminium thermal spray and of a zinc–aluminium pseudoalloy did not have such an effect. The residue of an aluminium thermal spray had a positively harmful influence on the repair painting over it. The degree of this influence was correlated with the thickness of the residual coating.

Keywords

Repair painting Accelerated exposure test Acid rain Metallic coating

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