전기화학적 부식 환경에 따른 알루미늄 5454 합금의 국부부식 거동

Abstract

The corrosion behaviors of Al5454 alloy was investigated by potentiodynamic and potentiostatic polarization tests in 5 wt.% NaCl solution. The pitting potential of the Al5454 was measured to be –0.77 VSCE by potentiodynamic test. Pitting and intergranular corrosion occurred on the surface of the alloy during potentiostatic tests at –0.8 VSCE ~ -0.7 VSCE, initiating at the interface of the precipitates and the matrix. The corrosion damage was intensified with an increase of applied potential and test time.