Hydrogen ion induced mechanochemical wear of soda lime silica glass in acid solutions

In this study, the friction and wear behaviors of soda lime silica (SLS) glass are studied by rubbing against Pyrex glass ball in various acid solutions. The experimental results show that as the solution pH increases from 0.5 to 6, the steady-state friction coefficient and wear volume of SLS glass increase firstly and then decrease. Further analyses indicate that the hydrogen ion concentration induced surface charge effect play critical roles in the wear behavior of SLS glass in acid solutions. When the solutions pH is 2.5, substantial direct contact at sliding interface will cause the highest friction and wear. In contrast, when the solution pH is lower or higher than 2.5, the interfacial direct contact can be weakened by the surface charge effect, therefore the friction and wear of SLS glass would be lower. These results may provide deeper understanding the material removal of oxide glasses during manufacturing and serving processes.