Figure 4
(a) 3 D APT reconstruction showing the Cr capping layer, ZDDP tribofilm and steel substrate. A 5 Wt.% of Zn iso-concentration surface (grey) is used to delimitate the tribofilm and (b) spatial distribution of Fe, Zn, S/O, FeO, PO and Cr atoms in the reconstruction Refer to the image caption for details.

(a) 3 D APT reconstruction showing the Cr capping layer, ZDDP tribofilm and steel substrate. A 5 Wt.% of Zn iso-concentration surface (grey) is used to delimitate the tribofilm and (b) spatial distribution of Fe, Zn, S/O, FeO, PO and Cr atoms in the reconstruction

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