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Barrel finishing is a widely used finishing technology with simple operation and wide applicability. However, the grinding fluid is used in this process, causing the problem of chemical oxygen demand (COD) exceeding the standard. It brings about environmental issues, wastewater treatment problems, and increased manufacturing costs. Therefore, a new kind of grinding fluid containing nanoparticles with a low COD value for barrel finishing is proposed. The grinding fluid is composed of graphene oxide (GO), sodium dodecyl benzene sulfonate (SDBS), and deionized water. The surface roughness of the aluminum alloy workpiece was improved under the grinding fluid containing nanoparticles GO. The influence of GO on surface process mechanism in barrel finishing was researched. In grinding fluid, the SDBS is adsorbed on GO by a self-assembly effect, forming new molecules. It affects the tribological behavior through the solid–liquid physicochemical interaction. Analyzing the tribological behavior indicates that GO plays a lubricating role by tribochemistry, which affects the workpiece surface roughness in barrel finishing. The grinding fluid containing nanoparticles with a low COD value reduces the difficulty of wastewater treatment and meets the green production need.

Influence of GO on surface process mechanism in barrel finishing