标题：Influence of ultraviolet irradiation on the surface chemistry and tribological properties of water-glycol lubricated Al-Mg-Ti-B coatings
作者：Yao, Kaiwen;Lu, Xinhong;Feng, Junxiao;Ouyang, Jun;Tian, Yun
作者机构：;;;;Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China
来源：Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology
关键词：Al-Mg-Ti-B coatings;Water-glycol lubrication;Ultraviolet irradiation;Boric acid;Anatase TiO2
摘要：In this work, we studied the effect of ultraviolet (UV) irradiation on the surface chemical states and tribological properties of the water glycol lubricated Al-Mg-Ti-B coatings by pin-on-disk unidirectional sliding test and X-ray Photoelectron Spectroscopy (XPS). XPS results indicate that boric acid is present at both the wear track and unworn surface of the UV-irradiated Al-Mg-Ti-B coating, as opposed to the case of Al-Mg-Ti-B coating untreated by UV irradiation, in which there is no clear evidence of the boric acid formation. We believe this is due to the UV-induced strong hydrophilicity in the presence of anatase TiO2. In addition, the observed distinct surface chemistries result in the different tribological behaviors for these coatings. This study, thereby, provides further insights into the role of anatase TiO2 in the tribological characteristics of Al-Mg-Ti-B coatings. (C) 2015 Elsevier Ltd. All rights reserved.