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 .

中文翻译：

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量化钙离子浓度对改良汉克斯溶液中高纯度镁，AZ91，WE43腐蚀的影响

改良的汉克斯溶液（不含Ca 2+离子）的腐蚀速率高于汉克斯溶液。HP Mg和AZ91的增加量约为12，WE43的增加量约为6。这定量地突出了Ca 2+离子对于合成体液中Mg腐蚀的关键作用。含Ca 2+的溶液产生了密集的羟基磷灰石腐蚀产物层，即Ca 3（PO 4）2）·Ca（OH）2，与腐蚀表面相比，其中大部分保留在腐蚀表面上（〜0.2–0.3）。不含Ca 2+的离子溶液，产生磷酸镁Mg 3（PO 4）2。