Sealing of PEO Coated AZ91 Magnesium Alloy Using La-Based Solutions

Table 5

Quantitative results (at %) of EDS analysis of the samples before and after 7 days of immersion.

	O%	Na%	Mg%	Al%	Si%	P%	La%	Cl%	S%
PEO	61.04	2.54	20.21	0.34	12.42	3.45	—	—	—
12 g/l La 30°C 10 min	60.62	2.33	14.91	0.42	9.61	3.69	8.42	—	—
12 g/l La 50°C 30 min	58.69	3.06	12.43	0.96	9.42	4.23	11.21	—	—
PEO Corr	64.20	2.00	19.20	0.3	9.47	2.50	—	1.1	1.23
12 g/l La 30°C 10 min Corr	63.42	2.12	18.26	0.3	8.96	2.42	2.54	0.96	1.02
12 g/l La 50°C 30 min Corr	63.84	3.00	12.36	0.4	7.67	2.79	9.56	0.15	0.23