Stress corrosion cracking behavior of IncoMAP Al-9052 alloy in 3.5% NaCl solution

Stress corrosion cracking(SCC) behavior of high strength aluminum alloys has been studied extensively. Various mechanisms including anodic dissolution, hydrogen embrittlement, passivating film tear, and so on, were proposed to explain their SCC behavior. IncoMAP alloy Al-9052 is an Al-Mg alloy manufactured by mechanical alloying process. It has considerable potential for the material development because of its light weight, high strength and excellent corrosion resistance. However, few researches have been done on SCC behavior of the aluminum alloy. This study focused to evaluate the initial stage of its SCC behavior using Double-Cantilever-Beam (DCB) specimen in 3.5% NaCl solution. The results suggested that the crack propagation behavior of the alloy was different from that of normal aluminum alloys. At initial stage, the crack propagation process could be divided into three steps with various mechanisms. Nevertheless, hydrogen embrittlement dominated its SCC.