CORROSION, FRICTION AND WEAR PROPERTIES O F VARIOUS MATERIALS IN MOLTEN ZINC

Iron and steel have been predominantly adapted for mechanical parts in hot-dip plating pots of continuous galvanizing line. However, corrosi on and wear resistance are not enough against molten zinc then mechani cal parts such as sink and support rolls must frequently be changed an d repaired to maintain good surface finishes of the products. In this work, corrosion resistance, friction coefficient and wear resistance-a gainst sialon ceramics on various steel, cermet and ceramics in molten zinc using a homemade testing machine were evaluated to search and de velop proper materials. The results can be summarized as follows : (1) Corrosion resistance of steel and cermet is low especially in moving bath. However, ceramics show excellent corrosion resistance. (2) Frict ion coefficient of steel is low, that of cermet scatters from as same level as steel to 1.5 times higher by sort and amount of metal include d. Friction coefficient of ceramics with carbon is low but without car bon is high. (3) Amount of wear loss scatters widely based on material s and composition. Wear loss is low in ceramics with carbon and high i n without carbon, that of steel and cermet is placed in the middle. (4 ) Ceramics with solid-lubricative property must be used at least one s ide of bearings at present. However,wettable ceramics against molten m etal are of great promise.