Effect of Pre-plating Copper on Interface Properties of Phosphor Bronze/Steel Bimetal Material

Phosphor bronze/steel bimetal materials with reletively high interface bonding strength were successfully prepared by preplating copper steel. SEM with EDS was used to analyze the microstructure and composition of phosphor bronze/steel interface in the bimetal material. The interface bonding strength was measured by pressure shear test. The results showed that the copper coating on the surface of steel could prevent phosphor element from diffusing into steel and forming phosphorus rich brittle phase, avoid the formation of cracks in interface, increase its interface bonding strength greatly.