Corrosion behaviour of bronze protected by organosilane coatings: Influence of alloying elements and phase composition

摘要

In this study the corrosion behaviour of bronze has been compared to that of both thealloying elements and the alloys reproducing the composition of the dendritic andinterdendritic phases. The results show that in bronze selective dissolution of Pbglobules occurs. Moreover, bronze is affected by the galvanic corrosion of copperrichdendritic regions stimulated by the nobler tin-rich interdendritic phase. When 3-mercaptopropyl-trimetoxy silane (PropS-SH) is applied on bronze the practical nobilityof the interdendritic zones remains higher than that of the dendrite cores, but thegalvanic activity of both regions is greatly reduced.