Micro/Nano-Scale Selective Phase/Area Corrosion Behavior of Nickel Aluminum Bronze (NAB)/Zn Composite Prepared by Friction Stir Processing

In this work, nickel aluminum bronze (NAB)/Zn composites were prepared by friction stir processing (FSP), and the selective phase/area corrosion behavior of the composites was studied in the micro/nano-scale by SEM and FIB/TEM. The results show that excessive Zn element can accelerate the corrosion or cause serious selective β′ phase corrosion. The areas with high Zn content, rich in CuZn particles or κ phase boundaries, are also the locations for priority corrosion.