Assessment of the Corrosion Behavior of a Sintered Al-Cu-Mg Alloy in Aeronautical Environments as a Function of the Heat Treatment
In the present work it has been studied the corrosion performance of a powder metallurgical aluminum alloy in aeronautical environments as a function of heat treatment. For this purpose an Al-Cu-Mg prealloyed powder was uniaxially pressed at 600 MPa followed by sintering at 590°C in nitrogen for 60 minutes. Subsequently sintered samples were heat treated to the T4 and T6 state. Corrosion behaviour was assessed by means of potentiodynamic polarization (PPT) in Dilute Harrison solution (DHS), which is considered to closely emulate the atmospheric environment for aircraft. PPT results for the equivalent wrought counterpart, AA2024 in its typical heat treatment for aeronautical applications T3, are also presented for comparison. The microstructure of each sample has been examined by Scanning Electron Microscopy (SEM) and Energy-Dispersive analysis of X-ray (EDX). Similar corrosion performance was observed for both the as sintered sample and its equivalent wrought counterpart, while corrosion resistance of the PM materials was improved by the heat treatment, especially in the T4 state.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
S. Sánchez-Majado et al., "Assessment of the Corrosion Behavior of a Sintered Al-Cu-Mg Alloy in Aeronautical Environments as a Function of the Heat Treatment", Materials Science Forum, Vols. 534-536, pp. 497-500, 2007