Effects Of Interrupted Aging On The Intergranular Corrosion Behavior Of Al-Cu-Mg-Ag Heat-Resistant Alloy

Purpose - The purpose of this study is to research the effects of interrupted aging on the corrosion behavior of Al-Cu-Mg-Ag heat-resistant alloy by means of intergranular corrosion (IGC) testing, potentiodynamic polarization combined with optical microscopy and transmission electron microscopy.Design/methodology/approach - The results show that the IGC began on the grain boundaries and continued along the grain boundary. The corrosion resistance property of Al-Cu-Mg-Ag alloy was enhanced by interrupted aging. The precipitations of the interrupted aged sample both in the grains and on the grain boundaries were fine, and the chain-like phases on the grain boundary were distributed nearly continuously.Findings -The corrosion resistance of Al-Cu-Mg series Al alloy with equilibrium phase (Al2Cu) is notably determined by precipitation-free zone (PFZ) as the self-corrosion potentials of (Al2Cu), PFZ and the matrix satisfied the relation EPFZ < E-0更多