Quantifying the influence of calcium ion concentration on the corrosion of high-purity magnesium, AZ91, WE43 in modified Hanks’ solutions | Zendy

Baptiste Py | Zendy; Sean Johnston | Zendy; Alexander Hardy | Zendy; Zhiming Shi | Zendy; Krzysztof Wolski | Zendy; Andrej Atrens | Zendy

Open Access

Quantifying the influence of calcium ion concentration on the corrosion of high-purity magnesium, AZ91, WE43 in modified Hanks’ solutions

Author(s) -

Baptiste Py,

Sean Johnston,

Alexander Hardy,

Zhiming Shi,

Krzysztof Wolski,

Andrej Atrens

Publication year - 2020

Publication title -

materials research express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.383

H-Index - 35

ISSN - 2053-1591

DOI - 10.1088/2053-1591/abb1f4

Subject(s) - corrosion , magnesium , calcium , ion , phosphate , chemistry , mass fraction , inorganic chemistry , materials science , nuclear chemistry , metallurgy , biochemistry , organic chemistry

The corrosion rate in a modified Hanks’ solution (containing no Ca 2+ ions) was higher than in Hanks’ solution. The increase was by a factor of ∼12 for HP Mg and AZ91, and a factor of ∼6 for WE43. This quantitatively highlights the critical role of Ca 2+ ions for Mg corrosion in synthetic body fluids. The Ca 2+ ion containing solutions produced a dense corrosion-product layer of hydroxyapatite, Ca 3 (PO 4 ) 2 ) · Ca(OH) 2 , a greater fraction of which stayed on the corroding surface (∼0.2–0.3) compared with the Ca 2+ ion free solutions which produced magnesium phosphate, Mg 3 (PO 4 ) 2 .

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