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. 2017 Apr 13;10(4):406. doi: 10.3390/ma10040406

Figure 19.

Figure 19

Dual structure of a consolidated rust layer formed during one year on carbon steel exposed al unsheltered conditions in a marine atmosphere with low chloride deposit (21 mg Cl/m2·d). Optical micrograph obtained by polarized light. The outer orange-coloured layer is mainly lepidocrocite while the inner greyish layer is mainly goethite and magnetite [150].