5.6.1.1 Surface
corrosion and selective corrosion
The removal of material from the surface
by aggressive media implies that the material has an isotropic
structure (as glasses do). The speed of the corrosion process
depends here on the solubility product . Ceramic materials,
however, generally have a heterogeneous microstructure, that
prevents uniform chemical attack over the surface.
This does not apply to ceramics containing a high proportion
of glass phase material. For this reason, corrosion-resistant
porcelains, such as laboratory porcelain, include an acid-resistant
glass phase. Application in alkaline media, however, is critical
for these materials.
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