The Research On The Corrosion Behavior,the Antioxidant Resistance To High Temperature And High Humidity,and The Tribological Performance Of MoS₂ Based Solid Lubricant Coating

The pure MoS₂ coating always performs high friction coefficient and short service life caused by severe oxidation when used in high humidity or after longtime storage in humid atmospheric environment.In this study,the MoS₂/Pb-Ti composite and MoS₂/Pb-Ti nanomultilayer coatings are deposited by unbalanced magnetron sputtering system to enhance the corrosion resistance in 3.5 wt%NaCl solution and salt spray experiment,improve the oxidation resistance and tribological performance in high humidity condition.In order to figure out the microstructure,chemical component,electrochemical corrosion behavior,corrosion resistance to salt spray,mechanical property and tribological performance of the MoS₂ based coating,laboratory equipments and methods such as:X-Ray diffractometer?XRD?,scanning electron microscope?SEM?,atomic force microscopy?AFM?,X-ray photoelectronspectroscopy?XPS?,transmissionelectronmicroscope?TEM?,potentiodynamic polarization,electrochemical impedance spectra?EIS?,salt spray test,nanoindenter and ballondisk reciprocating sliding tribometer are used to measure and analysis these properties.The analysis of microstructure indicate that the MoS₂/Pb-Ti composite and MoS₂/Pb-Ti nanomultilayer coatings have few defects,which microstructure are compact and uniform.The electrochemical impedance spectra and salt spray test prove that the MoS₂/Pb-Ti composite and nanomultilayer coatings can inhibit the permeation of oxygen and other corrosive elements due to these dense and contact microstructure and low porosity with less holes and defects,thus resulting a high corrosion resistance and better oxidation resistance.Furthermore,compared with pure Mo S₂ coating,the tribological performance of the MoS₂/Pb-Ti composite and multilayer coatings is also improved significantly owing to the high mechanical properties and preferable oxidation resistance,which root in the doping of Pb/Ti metal elements and the design of multilayered structure,respectively.Moreover,the heterogenous interfaces in MoS₂/Pb-Ti nonmultilayer coating play an important role to inhabit the appearance of holes or defects,improve the compactness,corrosion resistance and antioxidant ability of the coating.What's more,this research is the first study on the derivation of chemical components and tribological performances of the MoS₂/Pb-Ti nanomultilayer coating and pure MoS₂coating after 6 mouths exposure in marine atmospheric environment.The purpose why putting the coating in marine atmospheric environmental test station?Yongxing Island?,which locate in east of Paracel Islands,South China sea,is to truly realize the influence on the tribological performance of coating caused by longterm storage in harsh marine atmospheric environment with the feature of high temperature,high humidity,high salt fog,etc.The experiment results demonstrate that compared with pure MoS₂ coating,the MoS₂/Pb-Ti nanomultilayer coating performs better antioxidant property,and the multilayer coating still shows low friction coefficient and wear rate,which is hardly affected by the harsh storage condition.The significant improvement in tribological properties of multilayer coating is investigated by various analytical techniques.And it is found that the heterogenous interfaces existing in nanomultilayer coating exchange the structure of crystal face,and improve the compactness and mechanical properties of coating.In addition,the alloy phase in Pb-Ti layer also plays an important role in inhibiting oxidation of MoS₂.