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| ANTI-CORROSION BEHAVIOR OF COATING EXPOSED IN DIFFERENT REGIONS I. ACRYLIC/POLYURETHANE COATING |
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| 西南石油大学材料工程学院 |
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Abstract Effect of different climates on anti-corrosion of acrylic/polyurethane coating have been studied in this paper. Anti-corrosion of the coatings after exposed at Wuhan and Lasa were evaluated by gross loss rate， water absorption rate， rupture strength， salt spray test and EIS. The results showed that coating exposed in Lasa aged more severely than in Wuhan， accordingly anti-corrosion of coating in Lasa lost more badly than that in Wuhan. The main way of the degradation of the coating exposed in Lasa was photo-oxidation degradation. However the way of the degradations of the coating exposed in Wuhan were photo-oxidation and hydrolytic degradation. The capability of the coating exposed in Lasa to prohibit corrosive media through coating lost more badly than that in Wuhan. The electrochemical reaction rate， which was produced on the interface， was controlled by diffusion step after the coating was exposed in Lasa for 12 months. However， the electrochemical reaction rate was controlled by electrochemical step in Wuhan.
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Received: 12 April 2006
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