In Vitro Degradation Behaviors of Manganese-Calcium Phosphate Coatings on an Mg-Ca-Zn Alloy

Table 1

Composition of solutions and Mn content in the coatings of samples.

	Composition of phosphating solution (mol/L)	Mn content in phosphating coating (EDS in Figure 3) (wt%)
Sample 1	Base solution	0
Sample 2	Base solution with 0.01 mol/L Mn^2+	0.13%
Sample 3	Base solution with 0.03 mol/L Mn^2+	0.96%
Sample 4	Base solution with 0.05 mol/L Mn^2+	13.83%
Sample 5	Base solution with 0.07 mol/L Mn^2+	14.16%

Composition of base solution: 0.26 mol/L CaNO₃⋅4H₂O, 0.17 mol/L H₃PO₄ aqueous solution at pH 2.7.