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. 2017 Oct 12;7(10):315. doi: 10.3390/nano7100315

Figure 2.

Figure 2

FE-SEM images of the surface and cross-section of wet-corroded Ti foil at 50 °C in 5 M KOH aqueous solution for various time periods: (a,e) 6 h, (b,f) 12 h, (c,g) 24 h, and (d,h) 48 h.