Table 3.

Surface elemental compositions of the 18-14, 18-15, and 18-13-1 alloys at different analysis depths (atom %); before exposure to Hanks’ solution.

Element	18-14		18-15		18-13-1
	3 nm	100 nm	3 nm	100 nm	3 nm	100 nm
O	85	20	87	15	80	14
Ti	10	49	7	54	11	54
Zr	2	17	5	17	2	17
Nb	2	14	1	14	7	14
Ta	–	–	–	–	–	–