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. 2021 Dec 23;12(1):44. doi: 10.3390/nano12010044

Figure 16.

Figure 16

SEM images of aluminum specimens anodized in pyrophosphate solution (293K) at different voltages. (a) 10 V. (b) 25V. (c) 50 V. (d) 75V. Reprinted with permission from Ref [74]. Copyright 2018 Elsevier.