Figure 3 Cross section morphology of the gray iron inserts and thickness of zinc coating: (a) zinc barrel plating for 1 hour; (b) zinc barrel plating for 2 hours; (c) zinc barrel plating for 3 hours; (d) zinc rack plating for 1 hour

Figure 3
Cross section morphology of the gray iron inserts and thickness of zinc coating: (a) zinc barrel plating for
1 hour; (b) zinc barrel plating for 2 hours; (c) zinc barrel plating for 3 hours; (d) zinc rack plating for 1 hour