| With the rapid development of electronic information industry,rolled copper foil(RCF)has become the basic materials of flexible printed circuit boarddue to its excellent high ductility,bending resistance,high density and low roughness.Lubrication technology is indispensable to produce RCF with high surface quality and high conductivity.Rolling,friction and lubrication of RCF as a science of multidisciplinary penetration,which has been attracted more attention from the industry both at home and abroad.However,there isless related research and application work has been carried out on lubricating additives,friction and wears mechanism,and lubrication technology of RCF in rolling process.Although the additives used in the rolling oil will provide good lubrication performance,at the same time it will cause corrosion to the RCFsurface and affect the utility.Therefore,it’s necessary to study the adsorption,antifriction,corrosion and inhibition behavior of RCF in the rolling oil.Tribological characteristics of RCF rolling oil adding EP/AW additives with different concentration,load and speed of single system and compounded system were investigated using a four-ball tester.The relationship between friction and wear and the lubricating performances were studied through RCF rolling tests.Based on the maximum no-seizer load,friction coefficient,and wear scar diameter,a new performance indicator,the extreme pressure anti-wear lubrication coefficient,Ω,is put forward to analyze the lubrication properties of lubricant.A new EP/AW additive of nitrogen-and phosphorus-containing boric acid ester was designed and synthesized using MD method.It having good thermal stability and hydrolytic stability and also exhibited excellent EP/AW properties as additives in lubricating oils.When the mass fraction is 0.15%,in the friction process of steel and copper,the friction coefficient and wear rate of copper decreased by 59.4%and 45.2%,respectively.Nano tribofilm(～30nm)was composed of boron adsorption layer,organic metal complex compound containing nitrogen and phosphate inorganic reaction membrane,which formed on copper surface.P and S elements reacted with the iron and existed in the form of phosphates FePO4 and sulfates Fex(SO4)y,both of which contributed to the formation of a boundary lubricating film.The wear mechanisms of RCF and roller contain adhesive,plowing,peeling and others,in which adhesive wear plays a leading role.The corrosion law and mechanism of RCF was studied by loss weigh and surface microanalysis,which is considering the composition of rolling oils,temperature and time.It is the existence of BT and EK that causing the corrosion of RCF.Addition of inhibitor decreases the corrosion rate of RCF significantly.The inhibition efficiency increased with the increasing inhibitor concentration and temperature,and it reaches a maximum value of 89.02%whenthe concentration of DTA is 5.0 mM at 100℃.In the presence of inhibitor(BTA,MBA and DTA)in rolling oil has altered the surface wettability of copper by adsorbing at the copper surface and enhanced metal surface hydrophobicity.The shapes of inhibitors are spherical,hemispherical and cylindrical,etc.,which is determined by the concentration of corrosion inhibitors.The combination of weight loss,LSCM and SERS tests demonstrated that the inhibitor adsorbs on the copper surface according to Langmuir isotherm model.First principles calculations and surface characterization techniques to reveal new molecular adsorption mechanisms of anti-wear(EK)and anti-corrosion(DTA)additives on Cu surface during rolling process.Cu(110)surface was used in the model based on the strong(220)preferred orientation observed in the microstructures of the RCF.DFT calculations were performed to obtain the adsorption energy,optimized adsorption structures,and the charge transfer due to adsorption for EAK and DTA on Cu(110)surface.It was found that the anti-corrosion additive,DTA with the adsorption energy is-3.59 eV,decomposed and chemically adsorbed on Cu(110)surface strongly via multiple Cu-N and Cu-S bonds,while the anti-wear additive,EAK with the adsorption energy is-0.5 eV,adsorbed weakly due to one Cu-0 bond.The predicted chemical bonds formation with Cu surface agrees well with XPSanalysis.A new anti-corrosion mechanism,due to DTA decomposition and stronger chemisorption than EAK,is therefore proposed based on the simulation.Global,local activity and others indices of additives were calculated by quantum chemical and DFT.The relationship between the structures of the additives and their lubricating performancesin rolling process were discussed and adopted in the development of QSAR using quantum chemical calculation and GFA method.It makesQSAR modelsof the tribological performance,corrosion inhibition efficiency with molecular structure indices were authentic and have remarkable prediction accuracy.The design and synthesis of lubricating additive is to be provided a reference and guidance. |
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