Effect of surface abrasion on pitting corrosion of Al-Li alloy. (1st July 2018)

• Record Type: Journal Article
• Authors: Liu, Jianhua; Zhao, Kuo; Yu, Mei; Li, Songmei
• Is Part Of: Corrosion science. Volume 138(2018)
• Page Start: 75
• Page End: 84
• Publication Date: 2018-07-01
• Subjects: A. Aluminium -- A. Intermetallics -- B. EIS -- B. Polarization -- C. Pitting corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.04.010
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Statistical analysis was used to study the evolution of microstructure and pits. With the increase of grit number, more intermetallic particles were dissolved. Frequency of pits (metastable and stable) decreased with grit number increasing. Effect of intermetallic particles on pitting is bigger than that of surface roughness. Abstract: The effects of surface abrasion on microstructure and pitting corrosion of 2297 Al-Li alloy were investigated. Statistical analysis reveals that surface abrasion alters surface roughness and induces partial dissolution of intermetallic particles. A smoother surface finish reduces the population density and the average size of AlCuMnFe particles, due to enhanced dissolution of AlCuMnFe particles. All abraded samples undergo pitting corrosion, and surface layer dissolution (except pitting) is not observed. Smoother surface has lower pitting susceptibility and better corrosion resistance than the rougher surface. The intermetallic particles significantly affect pitting corrosion of 2297 Al-Li alloy, while surface roughness has small influence.