Figure 6
Schematic representation of the ZDDP anti-wear tribofilm. From top to bottom are Fe/Zn polyphosphate tribofilm (10-100 nm), oxide layer (≅ 10 nm), sulfur enrichment (≅ 5 nm) and steel substrate. The sulfur enrichment is shown to be unevenly distributed according to the findings by APT (Figure 5) Refer to the image caption for details.

Schematic representation of the ZDDP anti-wear tribofilm. From top to bottom are Fe/Zn polyphosphate tribofilm (10-100 nm), oxide layer (≅ 10 nm), sulfur enrichment (≅ 5 nm) and steel substrate. The sulfur enrichment is shown to be unevenly distributed according to the findings by APT (Figure 5)

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