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Table 1: Surface composition of the samples measured by ED XRF.

Sample Measuring points Fe (mass%) Cr (mass%) Ni (mass%) Mo (mass%) Cu (mass%) Mn (mass%) 1 a, b, c 65.19 16.44 14.89 2.13 0.73 0.62 2 a, b 67.06 15.23 13.99 2.22 0.86 0.64 3 a,b 7.60 2.65 2.35 0.00 87.40 0.00 4 a 58.62 13.75 12.49 2.08 12.88 0.18 b,c 4.25 0.00 8.06 2.30 85.39 0.00 5 a 73.32 16.78 6.18 0.18 1.10 2.44 b 70.67 15.21 1.53 0.01 2.90 9.68 6 a 0.00 0.00 100 0.00 0.00 0.00 b 0.00 0.00 70.31 0.00 20.35 0.00 ka ka0 67.58 17.12 12.27 0.26 0.75 2.02 kb kb0 68.39 16.23 10.45 0.18 3.01 1.74 kx kx0 72.73 13.11 0.48 0.04 2.95 10.69 ky ky0 0.37 0.00 24.87 0.00 45.05 0.00 kz kz0 64.91 17.12 1.04 0.53 1.94 14.45 21m 21m0, 21mk0 65.14 16.35 14.98 2.08 0.80 0.65 21v 21v0, 21vk0 70.51 16.86 9.33 0.09 1.84 1.37 22m 21m0, 21mk0 67.31 15.44 13.90 1.95 0.64 0.76 22v 22v0, 22vk0 65.94 16.27 14.89 2.02 0.53 0.36 23m 23m0, 23mk0 67.38 16.15 11.06 0.18 3.74 1.50 23v 23v0, 23vk0 67.07 16.17 11.13 0.17 3.91 1.55 24m 23m0, 23mk0 66.93 16.09 12.64 0.47 2.63 1.25 24v 24v0, 24vk0 67.50 15.74 12.43 1.18 1.92 1.23 25m 25m0, 25mk0 66.93 15.57 12.17 0.94 3.23 1.16 25v 25v0, 25vk0 66.19 16.11 14.88 1.90 0.53 0.40 26m 26m0, 26mk0 70.10 14.68 7.15 0.43 1.98 5.66 26v 26v0, 26vk0 66.44 15.43 14.51 2.15 0.55 0.92

In sample 6 (measuring point b) 9.34% Zn was determined and in sample ky 28.68% Zn, 1.6% Pb, and 0.43% Sn were determined.