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The Corrosion Behavior of Mg5Y in Nominally Distilled Water
Author(s) -
Cao Fuyong,
Zheng Dajiang,
Song GuangLing,
Shi Zhiming,
Atrens Andrej
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700986
Subject(s) - corrosion , materials science , distilled water , galvanic cell , galvanic corrosion , metallurgy , alloy , phase (matter) , matrix (chemical analysis) , composite material , chemistry , chromatography , organic chemistry
This paper studies the macro and micro corrosion of Mg5Y in nominally distilled water. The Y‐containing corrosion product film formed on the alloy surface provides some protection for the Mg matrix to the galvanic corrosion caused by Y‐containing second‐phase particles. In some cases, there is no corrosion of the matrix surrounding most of the second phase particles. However, about 2% of the second‐phase particles in the as‐cast Mg5Y causes micro‐galvanic corrosion, resulting in ‘bump’ or ‘volcano’ shaped corrosion product deposit. These ‘active particles’ cannot be significantly reduced by solution‐heat‐treatment.