THE FRICTION AND WEAR PROPERTIES OF CR2O3 COATING WITH AQUEOUS LUBRICATION

To research and develop water-based lubricants suited for use in ceram ic tribocouples is very important for the successful use of ceramics i n aqueous environments. A block-on-ring tester was used to investigate the effect of some water-based lubricants on Cr2O3 coating/Cr2O3 coat ing contacts at ambient conditions. Relative to water, lithium stearat e and magnesium stearate, suspended in water, can greatly reduce the f riction coefficient and wear volume of Cr2O2 coating, which can be att ributed to I:he adsorption of anion groups arraying in an orderly way on the rubbing surface. However, ethylenediaminetetraacetic acid disod ium salt (EDTA-Na), ethylenediaminetetraacetic acid magnesium-dipotass ium salt (EDTA-KMg) and polystyrol maleate sodium (PSMS) have slight l ubricating actions, due to multipoint adsorption of their polar groups . There exist hydrations of the coating with water in stearates and ED TA-KMg solutions.