Figure 3
(a) Chemical composition profile of the ZDDP tribofilm by XPS, sputtering from the top of the film to the steel substrate and (b) a concentration profile for the uppermost 100 nm Refer to the image caption for details.

(a) Chemical composition profile of the ZDDP tribofilm by XPS, sputtering from the top of the film to the steel substrate and (b) a concentration profile for the uppermost 100 nm

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