Corrosive-abrasive wear of porcelain enamel coatings

Abstract

in the production of enamelled chemical equipment, were selected. The enameling of the specimens (Fig. i) was done in four layers, two layers of ground-coat and two layers of cover-coat enamel (using the slip method normal in the industry). The total coating thickness of the working surface (the surface immersed in the test medium) of the specimen was 0.6-0.8 mm. The temperature range of the tests was 15-50~ (deviation from the specified temperature 176 The compositions of the corrosive media were H20 distillate (pH 7) + particles of silicon carbide SiC to GOST 3647-80 in a 5:12 volume ratio and 5%CHoCOOH solution + particles of silicon carbide (pH 2.4) in the same volume ratio. The rate of rotation of the specimen was 96 rpm. The eccentricity of the axes of rotation of the specimen and the drive was 12 mm. The corrosive abrasive wear of the tested enamel coatings was determined as the loss of weight of the coating per unit of area of its working surface per unit of test time. The -- ,~ ~ ../,"/,.