抄録
One of the definitions of lifetime of organic coating is considered as the time at which adhesion between the coating layer and its substrate is lost. In this paper, the durability of epoxy coating under several acidic environments was examined by the measurements of liqid penetration and adhesive strength.
Coating resin degraded by a chemical reaction in concentrated acid, so the lifetime of coating decreased. On the other hand, epoxy resin itself was stable to water, but water penetrated into the epoxy resin layer. This water weakened the adhasive force between the coating layer and its substrate physically, and became one of the factors controlling corrosion of substrate. So the lifetime of coating was shortened. Consequently, the epoxy coatings had a long life in dilute acid.
