Article ID Journal Published Year Pages File Type
7895626 Corrosion Science 2014 13 Pages PDF
Abstract
AA2024 clad with AA1050 was immersed in CeCl3 solution to promote deposition of cerium species. The deposition occurs on the entire sample surface for the alkaline etched substrate, while it is very limited for the degreased substrate. The surface potential (Volta potential) was investigated by scanning Kelvin probe force microscopy after different immersion times in CeCl3 solution. The preferential deposition of Ce compounds at Al-Fe intermetallic sites progressively reduces their Volta potential difference relative to the matrix in the alkaline etched substrate. This reduces the susceptibility to localized attack of the intermetallics as proven by potentiodynamic polarization measurements.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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