Antiwear Action of Mineral Lubricants Modified by Conventional and Uncoventional Additives |
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Authors: | Anna Matuszewska Marian Gradkowski |
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Affiliation: | (1) Institute for Terotechnology – National Research Institute, ul. K. Pulaskiego 6/10, 26-600 Radom, Poland |
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Abstract: | The authors of this paper investigated the influence of esters of rapeseed oil fatty acids on the lubricating properties of
mineral lubricants containing chosen AW/EP additives. Methyl esters, ethylene glycol esters, and glycerol esters as well as
some commercial AW/EP packages based on zinc dialkyldithiophosphate, S–P organic compounds, and sulphurized esters of fatty
acids were tested. The tribological tests were carried out with the use of a four-ball machine. Antiwear (AW) properties of
tested compositions were determined using their limiting load of wear (Goz(40)). It appears that the AW action of esters of rapeseed oil fatty acids depends on their structure. The best AW action is shown
by compositions of mineral oil lubricants containing AW/EP additives and methyl esters of rapeseed oil fatty acids. The SEM/EDS
analysis of the scar surface layer indicated that the presence of these esters in lubricants causes a change in the interaction
between AW/EP additives and the metal surface. These observations were confirmed by the XPS surface analysis. |
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Keywords: | AW/EP additives Esters of rapeseed oil fatty acids Lubricating properties Lubricating film Surface layer |
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