Percentage of elements for each specimen obtained from the energy dispersive X-ray spectroscopy (EDX) analysis after 12 h immersion in either 0.5 M HCl or 0.25 M H₂SO₄, in the presence or absence of 2 mM diazonium salt.

Sample	Element (weight%)
	C	N	O	Fe
MS in HCl	3.5	1.1	5.1	86.4
MS in HCl + DA	30.1	1.2	6.7	60.2
MS in H2SO4	2.2	1.4	39.1	40.3
MS in H2SO4 + DA	40.8	1.8	11.1	45.1