Temperature-Dependent Effect of Boric Acid Additive on Surface Roughness and Wear Rate

Abstract

Wear and friction hold an important place in engineering. Currently, scientific societies are struggling to control wear by means of studies on lubricants. Boric acid constitutes an important alternative with its good tribological properties similar to MO2S and graphite alongside with low environmental impacts. Boric acid can be used as a solid lubricant itself whereas it can be added or blended into mineral oils in order to yield better mechanical and tribological properties such as low shear stress due to the lamellar structure and low friction, wear and surface roughness rates. In this study, distinguishing from the literature, boric acid addition effect considering the temperature was investigated for the conventional ranges of internal combustion engines. Surface roughness, wear and friction coefficient values were used in order to determine tribological properties of boric acid as an environmentally friendly additive and mineral oil mixture in the present study. Wear experiments were conducted with a ball on disc experimental setup immersed in an oil reservoir at room temperature, 50[Formula: see text]C and 80[Formula: see text]C. The evolution of both the friction coefficient and wear behavior was determined under 10[Formula: see text]N load, at 2[Formula: see text]m/s sliding velocity and a total sliding distance of 9000[Formula: see text]m. Surface roughness was determined using atomic-force microscopy (AFM). Wear rate was calculated utilizing scanning electron microscope (SEM) visuals and data. The test results showed that wear resistance increased as the temperature increased, and friction coefficient decreased due to the presence of boric acid additive.

Experimental studies on viscosity, thermal and tribological properties of vegetable oil (kapok oil) with boric acid as an additive

“…The nanoboric acid [27] were added with engine oil (5W40) and its tribological properties were investigated using the ball on disc reciprocating tribometer and the results indicate nBA can considerably improve the tribological properties. The boric acid had better tribological property [24, 28], the wear resistance was increased as the temperature increased, and the friction coefficient decreased [29]. Based on the available literature, it can be concluded that the suspension of boric acid as an additives with vegetable oil and mineral oils provides a better result to reduce the friction and wear between the two sliding contacts.…”

Tribological behavior of the low‐concentration boric acid and ZDDP lubricating oil mixtures

“…Ekinci added boric acid into the mineral base oil and tested this mixture with the ball on disk tribometer at the room, 50 and 80°C temperature. He reported friction and wear reduction of boric acid‐base oil mixture for 50 and 80°C temperature without tribochemical analysis of the surfaces . However, boron compounds have not been replaced with ZDDP as a commercially antiwear additive at last decade and research studies attempting to develop boron‐based environment‐friendly antiwear additive have been continued.…”

“…He reported friction and wear reduction of boric acid-base oil mixture for 50 and 80°C temperature without tribochemical analysis of the surfaces. 26 However, boron compounds have not been replaced with ZDDP as a commercially antiwear additive at last decade and research studies attempting to develop boron-based environment-friendly antiwear additive have been continued. The aim of this study is to explore whether boric acid can be an alternative environment and catalysis Results showed that boric acid-base oil mixture reduced wear when compared with the base oil; however, its antiwear performance was poor against the ZDDP.…”