The tribo-chemical interplays between hard coatings and lubricant additives have attracted considerable attentions during recent years. It has been demonstrated that Al-Mg-Ti-B coatings exhibit a good tribo-chemical compatibility with typical lubricant additives zinc dialkyldithiophosphate (ZDDP) and molybdenum dialkyl-dithiocarbamate (MoDTC). Herein, a systematic study was conducted on the tribological behaviors of N-incorporated Al-Mg-Ti-B coatings under MoDTC lubrication. By addition of N in the coatings, TiO₂ at the coating surfaces was found to be partially reduced into TiO_2−x. Notably, the formation of MoO₃ and/or FeMoO₄ was shown to be substantially suppressed in MoDTC tribofilms on N-incorporated Al-Mg-Ti-B coatings, resulting in a MoS₂-dominated MoDTC tribofilm formed on the coating surfaces. Such interesting tribo-chemical behavior has been tentatively explained in terms of excess charge transfer from TiO_2−x and subsequent reduction of MoDTC decomposition intermediates MoS_xO_y and/or MoS_z, thereby preventing the MoO₃ and/or FeMoO₄ formation in MoDTC tribofilms. This finding may provide a new approach for improving the friction reduction performance of MoDTC-lubricated tribo-contacts.

近年来，硬涂层和润滑剂添加剂之间的摩擦化学相互作用引起了相当多的关注。已经证明，Al-Mg-Ti-B 涂层与典型的润滑剂添加剂二烷基二硫代磷酸锌 (ZDDP) 和二烷基二硫代氨基甲酸钼 (MoDTC) 表现出良好的摩擦化学相容性。在此，系统研究了含氮 Al-Mg-Ti-B 涂层在 MoDTC 润滑下的摩擦学行为。通过加入N涂料，氧化钛₂在涂层表面被认为是部分还原成的TiO _2-X 。值得注意的是，MoO ₃和/或 FeMoO _{4 的形成}显示在掺入 N 的 Al-Mg-Ti-B 涂层上的 MoDTC 摩擦膜中被显着抑制，导致在涂层表面上形成MoS ₂主导的 MoDTC 摩擦膜。这种有趣的摩擦化学行为已经初步解释为来自 TiO _2-x的过量电荷转移和随后 MoDTC 分解中间体 MoS _x O _y和/或 MoS _{z 的减少}，从而防止 MoO ₃和/或 FeMoO ₄在MoDTC 摩擦膜。这一发现可能为提高 MoDTC 润滑摩擦接触的减摩性能提供一种新方法。