Tribological properties of aqueous solutions with polyether and borate

Abstract

Due to poor lubrication performance of water, it is essential to select water-soluble additives with good functions to improve its tribological properties. Cocamide polyoxyethylene (CPOE) and triethanolamine borate (BN) are selected as additives to study the tribological properties of aqueous solutions with CPOE and CPOE-BN in the research. Film-forming abilities are measured by NGY-6 nanoscale film thickness gauge. Results show that both aqueous solutions have good film-forming abilities at a low concentration. Friction reducing and anti-wear properties, stabilities and extreme pressure are studied by MRS-10A four-ball tester. Results show that both solutions have a low and relatively stable friction coefficient. Friction coefficient is lower by the mixture of CPOE and BN than the single CPOE, so as the wear rate at a high load. At last, components of chemical elements on the surface of wear scar are analyzed by X-ray photoelectron spectroscopy. Results show that boron nitride, iron boride and other compounds are generated, playing an important role in reducing friction and wear. Studies indicate that CPOE and BN have a good synergistic effect on lubricating. They can be used in industry with a good prospect as green water-based lubricants.