[China Glass Network] The atmosphere will also erode glass. The erosion of the atmosphere is essentially the sum of water vapor, CO2, SO2 and so on. The glass is eroded by the moist atmosphere and begins on the glass surface. Some ions on the surface of the glass adsorb water molecules in the air. These water molecules cover the surface of the glass in the form of OH-groups, and continuously absorb water molecules (or other substances) on the atomic groups to form dozens of molecules. Thin layer. If the content of K2O, Na2O and CaO is small in the glass composition, the thin layer will not continue to develop after it is formed; if the glass composition contains more basic oxides, the adsorbed water film will become alkali. A solution of a metal hydroxide that further absorbs moisture while destroying the surface of the glass.
Practice has shown that water vapor is more aggressive than aqueous solutions. It has been pointed out that the erosion of glass by aqueous solution starts from the ion exchange between Na+ and H+. The rectangular shape is reduced gradually due to the reduction of Na+ in the surface layer of glass (after formation of silicon oxide film), which tends to be slower. stop. This is carried out in the presence of a large amount of water, so that the alkali (Na+) released from the glass is continuously transferred to the aqueous solution (continuous dilution). Therefore, during the erosion process, the pH of the water near the surface of the glass does not change significantly. The water vapor is not. It is adhered to the surface of the glass by the droplets of water. The released alkali is not removed, but accumulates in situ. As the erosion progresses, the alkali solubility becomes larger and larger, the pH rises rapidly, and later resembles alkali corrosion, thereby greatly accelerating the erosion of the glass. Therefore, the erosion of water vapor by glass is firstly a process of releasing alkali, which is mainly for exchange, and then gradually transitions to a dissolution process mainly based on destruction of the network.
Tests have shown that the erosion of glass by water vapor and aqueous solutions is of a completely different type (especially in the later stages of erosion), and the former has much greater erosion capacity than the latter. The water level gauge used in high temperature and high pressure is particularly severe, which is undoubtedly related to the erosion characteristics of water vapor. At high temperatures and pressures, the ionization of water accelerates the erosion of the glass.
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