Fig.3 Surface observation by SEM of samples after a soak in synthetic seawater at 25℃ for a year. (a) & (b) 6I-1, (c) 6I-4 and (d) 6I-7.

　

Fig. 4 EPMA analyses on the intermetallic compounds in micropit. (a)composition image, (b)Fe, (c)Si, (d)Mg, (e)Cr and (f)Mn distributions

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