Korozní odolnost ocelových plechů s vybranými nátěry

Abstract

This thesis deals with determining the corrosion resistence of coated low-carbon steel sheets. One type of steel sheet was additionally coated with a layer of zinc. Each of these materials was coated with four different coatings. The coatings used were RAL9003, RAL9003S, RAL9005, RAL9016. First, the thicknesses of the applied coatings were measured for each sample. The samples were then subjected to corrosion resistance tests. These tests included a moisture resistance test and a salt spray test. The latter test determined the degree of corrosion, the degree of undercutting, the weiht gain, the adhesion and the delamination of the coatings. From the performed tests it was evident that each type of steel sheet had the best results with a different coating. The best corrosion resistance of the samples without presence of zinc layer was achieved with RAL9003. The samples with zinc layer achieved the best results with the RAL9003S. Overall, the best rated coating was RAL9003. On the contrary, the RAL9016 provided the worst corrosion resistance for both types of steel. This coating was therefore rated as the worst.