Corrosive Wear Behavior of Commercial Aluminium Engine Block and Piston in 3.5% NaCl Solution

摘要

The tribological performance of commercially used aluminium engine block and piston was evaluated at ambient conditions under dry and corrosive environment using a pin-on-disc with an applied load of 20 N at sliding velocity of 0.29 ms-1 and with varying sliding distance ranging from 260 m - 4200 m. The worn surfaces were characterized by optical microscope, SEM and EDX analyzer. The results showed that the nature of the wear rate was similar in both environments for both alloys which initially increases afterwards decreases to more or less a constant value. Moreover, for the block and piston alloys, the wear rate in corrosive environment was significantly higher than the dry condition. Due to the presence of Ni, higher percentage of Mg and lower percentage of Fe, the aluminium piston alloy showed higher wear performance than that of the block alloy.