Quantifying the influence of calcium ion concentration on the corrosion of high-purity magnesium, AZ91, WE43 in modified Hanks’ solutions
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 flu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/abb1f4 |
| Summary: | 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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| ISSN: | 2053-1591 |