Synergy between surface mechanochemistry and subsurface dissolution on wear of soda lime silica glass in basic solution

Abstract

The polishing of oxide glass in aqueous solution is sensitive to not only the mechanical conditions applied by abrasives but also the chemistry of solution. This study elucidates the synergistic interactions of mechanical and chemical effects-especially, the synergetic effects of surface mechanochemical wear and subsurface dissolution are studied by measuring the material removal rate of soda lime silica (SLS) glass upon rubbing with a Pyrex glass ball in noncorrosive (neutral pH) in corrosive solutions (pH 10 and 13 NaOH) as a function of sliding speed. Based on the synergetic model of surface wear and subsurface dissolution, it is found that the mechanochemical surface reaction dominates the wear behavior of SLS glass in neutral and pH 10 solution conditions; the wear of SLS glass in pH 10 is enhanced, compared to the neutral pH case, due to the presence of OHions at the sliding interface. In the case of pH 13, the dissolution of the densified subsurface region, which is formed due to interfacial friction during the surface wear, becomes significant, further enhancing the material removal yield. The finding provides an insight for designing an efficient polishing process in manufacturing of oxide glass materials with a good surface finish.

Vibrational spectroscopy analysis of silica and silicate glass networks

“…The plots in (C) and (D) compare the cross-section line profiles of the topography and S 2 images of the fresh and annealed nanoindentation marks, respectively, at the location marked with red lines in (A). 218 Reprinted with permission from He et al 218 under basic dissolution, 58,243 or upon exposure to hightemperature steam. 244 Even without frictional shear, normal indentation alone can cause the subsurface structural change.…”

Recent Advances in Corrosion Science Applicable To Disposal of High-Level Nuclear Waste

“…103 It should be noted that the corrosion behavior of mechanically fractured or crushed powder surfaces may be different from those of thermally produced surfaces. 91,167,168 Compared to these conventional methods, vibrational spectroscopy can provide improved surface sensitivity due to the high absorptivity of the network vibrational modes of glass. 169,170 However, vibrational spectral information can still be convoluted with the bulk contribution if the corrosion layer is thinner than the effective probe depth of the vibrational spectroscopy method.…”

“…In glass science, X-ray or neutron scattering, NMR, and vibrational spectroscopy are widely used structural probe methods. ,− Because conventional scattering and NMR techniques are not highly surface-sensitive, , fine powders are often used to increase the volume fraction of the corrosion layers . It should be noted that the corrosion behavior of mechanically fractured or crushed powder surfaces may be different from those of thermally produced surfaces. ,, Compared to these conventional methods, vibrational spectroscopy can provide improved surface sensitivity due to the high absorptivity of the network vibrational modes of glass. , However, vibrational spectral information can still be convoluted with the bulk contribution if the corrosion layer is thinner than the effective probe depth of the vibrational spectroscopy method. , …”

Estimating Internal Stress of an Alteration Layer Formed on Corroded Boroaluminosilicate Glass through Spectroscopic Ellipsometry Analysis

“…Usually, glass corrosion starts at a high rate and gradually slows down to a very low residual rate. − Ion-exchange, precipitation of secondary phases, gel formation and dissolution, and diffusion of water and other mobile species through the gel layer are the main factors considered in the current literature. , These processes altogether lead to the formation of nanoporous surface layers with modified compositions, hereafter referred to as alteration layers. , The differences in chemical composition, porosity (density), and network connectivity of the alteration layer from those of pristine bulk glass may result in an internal stress in the layer, which then can affect its stability due to variation in the system free energy under a mechanical stress. Enhanced corrosion rates have been reported for modified glass networks in densified regions of borosilicate, soda lime silica, , and hydrostatic pressure applied silica glasses . Such observations suggest that strained Si–O–Si bonds in the network may have higher susceptibility to hydrolysis reactions. , Given this, any change in the network bond parameters of the alteration layer may alter the chemical reactivity of network-forming bonds, which then will modify the corrosion behavior of glass.…”

“…6,7 The differences in chemical composition, porosity (density), and network connectivity of the alteration layer from those of pristine bulk glass may result in an internal stress in the layer, 8 which then can affect its stability due to variation in the system free energy under a mechanical stress. Enhanced corrosion rates have been reported for modified glass networks in densified regions of borosilicate, 9 soda lime silica, 10,11 and hydrostatic pressure applied silica glasses. 12 Such observations suggest that strained Si−O−Si bonds in the network may have higher susceptibility to hydrolysis reactions.…”