Abstract
In the first paper, the results of wear tests on anticorrosive platings in seawater were reported at a fixed very low sliding speed under different potentials. The primary result showed that Ni-base plating generally had better corrosive wear resistance than Cr-base plating.
In the present study, a wear test was carried out to clarify the effects of sliding speed and facing materials (Al2O3, SUJ2, and identical plating) on corrosive wear characteristics of Ni, Ni-P, and Cr platings. The results indicated that each type of plating is differently affected by each sliding speed and facing material. Cr plating shows a lower wear rate than the other platings over a wide sliding speed range and for all facing materials, and therefore is proposed as a repair material for worn surfaces of machine parts. Ni plating suffers severe surface damage from adhesive wear when sliding against the identical plating. The wear rate of Ni-P plating increases rapidly with an increase of sliding speed. Mechanical wear through adhesion seems to be a more dominant damage mechanism than chemical corrosion by seawater under this test condition.
