Corrosion resistance of sapphire crystals

Corrosion resistance of sapphire crystals

Sapphire is sufficiently resistant to sulfur vapors up to ~1,300 K; 1,100 K for sodium and potassium (1% sapphire mass loss during sodium melt at 1,200 K160 h); 2,200 K for tin; 1,300 K in caustic soda; 1,300 K in iodine and iodide; 1,500 K in hydrogen sulfide and CO2 and 1,300-1,400 K in titanium tetrachloride. Sapphire structural components are available in Mg, Al, Cr, Works in Ni, Cs, Pb, Bi and Zn melts and their alloys, as well as rare earth metals, cast iron and steel melts. The crystals are resistant to hot aqueous solutions and many chemical melts (Table 2.27, Figure 2.106).

Corrosion resistance of sapphire surface. Since sapphire is widely used in chemical technology, it is necessary to know the conditions of maximum corrosion resistance of sapphire product surface. The corrosion resistance of sapphire to different corrosive media has been studied [112-114], but the data obtained It is mainly about the corrosion resistance of the block.

The resistance of a surface to corrosive media is affected by surface-adjacent layer defects formed during mechanical treatment. More importantly, it is determined by the bulk structural defects reaching the surface; the density and distribution of these defects is determined by the crystal growth method. Sapphire is anisotropic ; So it is necessary to consider the atomic bond properties of crystallographic planes, their electronic structures and energy properties.

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