| In the industrial production,friction and wear are common prominent problems in energy consumptions and economic losses,so it is of great necessity to decrease friction and steady wear.In the marine environment,chlorides do harm to building materials,so it is also of importance to explore corrosion behavior thourgh electrochemical techniques.At present,graphene has been explored for the nearly two decades,and two-dimensional materials are still current research hotspots.As sandwich structure Mo S2 exhibits better lubrication effect than graphene under the shear force.As a smaller part of nanomaterials,quantum dots have been fully applied in the field of optics.However,in the field of tribology and corrosion,Mo S2 quantum dots still need lots of works to lay a powerful foundation.As is known to all,nanomaterials are easier observed oxidation,sedimentation,agglomeration at the macro level because of size effect,high surface energy and gravitational effects.Therefore,nanomaterials are limited on the lubrication field.Researchers often take various methods to obtain more outstanding performance,such as physical absorption and chemical absorption.In this thesis,isopropanol as dispersant,Mo S2 quantum dots were prepared by ice-bath liquid phase exfoliation.On this basis,Mo S2 quantum dots were modified with Benzimidazole,2-Mercaptobenzimidazole and Graphene.The researches were carried out from two angles both friction and corrosion.The main contents and conclusions are as follows:(1)Investigation of tribological properties and corrosion behaviors of Mo S2 quantum dots additives.Mo S2 quantum dots are modified with hydroxyl groups from isopropanol and the thickness of Mo S2 quantum dots is 1.2 nm.It is confirmed by SEM,TEM and computational chemistry that Mo S2 quantum dots are spherical.The results of the four-ball tribotester indicated that Mo S2 quantum dots possess superior antifriction and wear resistance.Compared with isopropanol,the friction rate and wear rate of Mo S2 quantum dots are reduced by 72.4%and 18.1%respectively at 98 N and 600 rpm.Interestingly,the work found that isopropanol is converted to graphene during the tribochemical reactions.The electrochemistry tests of Q235 immersed in Mo S2 quantum dots additives.The results indicated that the impedance spectrum appears an inductive arc when Mo S2 quantum dots are adsorbed on the surface of steel as a film.(2)Investigation of tribological properties and corrosion behaviors of Benzimidazole@Mo S2quantum dots additives.The results of the four-ball tribotester indicated that Benzimidazole@Mo S2 quantum dots possess antifriction and wear resistance.Compared with isopropanol,the friction rate and wear rate of Benzimidazole@Mo S2 quantum dots are reduced by 17.2%and 26.9%at 98 N and 600 rpm respectively.However,Benzimidazole@Mo S2 quantum dots do not improve the friction of Mo S2 quantum dots.The electrochemistry tests of Q235 immersed in Benzimidazole@Mo S2 quantum dots additives.The results indicated that the impedance spectrum still appears an inductive arc when Benzimidazole@Mo S2 quantum dot is adsorbed on the surface of steel as a film.(3)Investigation of tribological properties and corrosion behaviors of2-Mercaptobenzimidazole@Mo S2quantum dots additives.The results of the four-ball tribotester indicated that 2-Mercaptobenzimidazole@Mo S2 quantum dots possess super antifriction and wear resistance.Compared with isopropanol,the friction rate and wear rate of2-Mercaptobenzimidazole@Mo S2 quantum dots are reduced by 81.6%and 43.6%at 98 N and600 rpm respectively.By comparison,it is found that sulfhydryl groups play a key role in reducing friction.The electrochemistry tests of Q235 immersed in Mo S2 quantum dots additives.It is found that the inductive arc is obvious and corrosion resistance decreases with the increase of immersing time.(4)Investigation of tribological properties and corrosion behaviors of Graphene@Mo S2quantum dots additives.The results of the four-ball tribotester indicated that Graphene@Mo S2quantum dots possess antifriction and wear resistance.Compared with isopropanol,the friction rate and wear rate of Graphene@Mo S2 quantum dots are reduced by 51.7%and 24.0%at 98 N and 600 rpm respectively.However,Graphene as additives do not improve the friction of Mo S2 quantum dots.We hypothesize that the sandwich structures play an important role compare to monolayer graphene.The electrochemistry tests of Q235 immersed in Mo S2quantum dots additives.The results indicated that corrosion resistance reaches the maximum when the graphene is immersed for 1 h and reflects the inhibition effect of graphene on the electrolyte solution. |
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