“…ZnDPT tribofilm formation on DLC surfaces has been investigated extensively. Some research reported no tribofilm formation on the DLC coatings (Kalin et al, 2004) while others reported that tribochemical interactions of ZnDPT with DLC coatings result in the formation of a tribofilm with either a patchy-like or pad-like structure (Zahid et al, 2015). Aboua, Umehara, Kousaka, Tokoroyama, Murashima, Tasdemir, Mabuchi and Higuchi, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.12, No.7 (2018) Investigation by FESEM revealed that some tribofilm were present at the surface of disk samples investigated in this work after the tribological tests in PAO + ZnDTP oil.…”