Ren Tian-hui
2009
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Journal
Tribology
Abstract
Two water-soluble lubricant additives,dodecenylsuccinic acid(DSA) ammonium salt and sulfurized dodecenylsuccinic acid(SDSA) ammonium salt were prepared from dodecenylsuccinic anhydride.Their tribological behaviors were examined by four-ball tester.The worn steel surfaces were investigated by scanning electron microscopy(SEM),and the chemistry of tribofilm and thermal film generated from SDSA ammonium salt was analyzed with X-ray absorption near-edge spectroscopy(XANES).The results show that the two compounds possess good anti-wear and friction-reducing properties under moderate applied loads.According to the XANES results,the tribofilm and thermal film generated from SDSA ammonium salt were mainly composed of adsorbed layer and reactive layer.The chemical states of S in adsorbed layer was mainly alkyl disulfide,while in reactive layer were FeSO4 and FeS.