Open AccessQuantifying 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 .