Abstract
This study is devoted to wearing resistance of MAO-coatings formed on aluminum alloys 2024 (Al-Cu-Mg) and 7075 (Al-Zn-Mg-Cu) at the friction in pair with steel 100Cr6 in environmentally safe lubricants and represents a generalization and analysis of tests’ results. Investigations were conducted using two methods: reciprocating sliding on the “ball-on-disk” friction scheme and unidirectional sliding on the “pin-on-disk” friction scheme. As environmentally lubricants were used some base oils like polyalphaolefin (PAO), polyethylene glycol (PEG), Silicon Oil, perfluorinated polyether (PFPE) and diisotridecyl adipate ether (DITA). Tests on the first friction scheme allowed us to determine the maximal value of load for investigated friction pairs and tests on the second friction scheme showed their antifriction properties in different lubricants and in the mode of the greasing starvation. There was revealed that MAO-coatings formed on alloy 7075 at high contact pressures demonstrate a friction coefficient lower than on alloy 2024. Some problems of the used “pin-on-disk” scheme is discussed also for improving the tests’ results data.
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