Quantitative Correlation of 7B04 Aluminum Alloys Pitting Corrosion Morphology Characteristics with Stress Concentration Factor

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Liu, Zhiguo^1 ; Yan, Guangyao^1 ; Mu, Zhitao^1 ; Li, Xudong^1

Naval Aeronautical Engineering Academy, Qingdao Branch, Qingdao

266041, China^1

关键词: 7B04 aluminum alloy;    Airport environment;    Aluminum alloy structures;    Corrosion morphology;    Corrosion pit depth;    Pitting corrosion damage;    Quantitative correlation;    Stress concentration factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012086/pdf
DOI  :  10.1088/1757-899X/301/1/012086

来源: IOP

【 摘 要 】

The accelerated pitting corrosion test of 7B04 aluminum alloy specimen was carried out according to the spectrum which simulated airport environment, and the corresponding pitting corrosion damage was obtained and was defined through three parameters A and B and C which respectively denoted the corrosion pit surface length and width and corrosion pit depth. The ratio between three parameters could determine the morphology characteristics of corrosion pits. On this basis the stress concentration factor of typical corrosion pit morphology under certain load conditions was quantitatively analyzed. The research shows that the corrosion pits gradually incline to be ellipse in surface and moderate in depth, and most value of B/A and C/A lies in 1 between 4 and few maximum exceeds 4; The stress concentration factor Kf of corrosion pits is obviously affected by the its morphology, the value of Kf increases with corrosion pits depth increasement under certain corrosion pits surface geometry. Also, the value of Kf decreases with surface width increasement under certain corrosion pits depth. The research conclusion can set theory basis for corrosion fatigue life analysis of aircraft aluminum alloy structure.