EROSION OF PVD TIN COATINGS UNDER SIMULTANEOUS CORROSION IN SODIUM CARBONATE BICARBONATE BUFFER SLURRIES CONTAINING ALUMINA PARTICLES/

Following a preceding report, this paper summarises preliminary result s for the study of PVD TiN coatings prepared on mild steel, BS6323, un der potentiodynamically controlled corrosion during erosion in an alka line slurry containing alumina particles. The erosion term was obtaine d when the total erosion-corrosion loss had been measured by sample we ighing and the corrosion term obtained as described previously. The er osive wear tracks were examined, in conjunction with investigation int o evidence of corrosion damage, by scanning electron microscopy. The s ignificant, superior erosion resistance of the coating to that of the uncoated mild steel and AISI 304 stainless steel mainly resulted from the exceedingly high coating strength and its stability under the simu ltaneous corrosion attack. The erosion term was compared with the prev iously measured corrosion term, and their respective contributions to the overall erosion-corrosion damage evaluated for each sample. (C) 19 98 Elsevier Science S.A.