Acid Resistance of Enamel Frit
The acid resistance of enamel frit is a more important indicator. Whether it is an enamel or industrial enamel that has certain requirements for acidity resistance. Most of the daily enamel dishes is acetic acid, lactic acid, citric acid, fruit juice, etc. Organic acids, therefore require enamel layers with good resistance to organic acid, and cannot be obtained by corrosion of organic acid. Most of the industrial enamel is contaminated with hydrochloric acid, sulfuric acid, nitric acid, etc., these acids are very corrosive, and sometimes the special acid-resistant enamel frit is selected.
There are many factors affecting acid resistance resistance of enamel frit, the structure of the enamel frit, the fuse temperature, the degree of melting, the grinding, the particles of grinding, the burnfute process, etc., the most important factors are ceramic glazhes. Chemical composition. Al2O3, SiO2, TiO2, CeO2, ZrO2, SnO2, etc., especially the resistance of SnO2 on organic acids.
The degree of fusion of the enamel fuse also affects its acid resistance, and the enamel frit fuse is firing, the porcelain surface is rough, and there is bubble, the gloss is poor and acid. The fuse is not good, in addition to the physical properties of the porcelain layer, the physical properties of the porcelain layer can cause the porcelain surface to be uncoiled, not delicate, and unintended, the enamel product made in this later The determination of the results in the acid test.
If it is a enamel frit that is resistant to strong acid, it is best to grind or do not gestically coarablate, which will reduce acid resistance, properly grinding some SNO2 or ZrO2, can increase acid resistance.
The intensity order of organic acid to porcelain enamel frit is: carbonate phrochloride <lactic acid <tartaric acid <citric acid <oxalic acid;
The intensity order of the inorganic acid to the porcelain enamel frit is: phosphoric acid <nitric acid <sulfuric acid <hydrofluoric acid.