Effect of the incorporation of chromating reagents in an acrylic lacquer applied on galvanised steel, galvanneal and galfan during the UVCON test

摘要: Abstract This paper analyses the effect of exposure to humidity and UV radiation (UVCON test) an organic coating (lacquer) containing chromating reagents applied on galvanised steel, galvanneal galfan substrates. An attempt is made establish possible relationships between degradation lacquered surface during its presence or absence alloying elements original zinc-based substrate. With steel coatings, 60 days UVCON test are necessary for a slight reduction in lacquer content be observed. Removal leaves Cr(III) formed substrate exposed. coating, chromate layer grows initial aluminium oxide film. contrast galfan, 15 sufficient detachment Longer times lead appreciable increase percentage removed. Surprisingly, remains preventing corrosion, even after exposure. XPS data suggest CrOC type bonds at interface, due oxidation associated with Cr(VI) Cr(III), which contribute significantly adhesion.