CATALYTIC COATING AND METHOD OF ITS PRODUCTION Russian patent published in 2019 - IPC C25B11/04 C25B1/26 

FIELD: chemistry.

SUBSTANCE: invention relates to coated substrate from valve metal with coating, which includes a beastite first catalytic layer, consisting of amorphous phase Ta₂O₅ in a mixture with a tetragonal ditetragonal-dipiramidic crystalline phase, consisting of either RuO₂, or from RuO₂ solid solution and SnO₂, wherein said first catalyst layer has a weight ratio of said amorphous phase to said crystalline phase, ranging from 0.25 to 2.5, and the weight ratio of Ru to Sn in said crystalline phase ranges from 0.5 to 2, and second catalyst layer applied on said first catalyst layer from outside, said second catalyst layer consisting of amorphous phase Ta₂O₅, mixed with tetragonal ditragonal-dipiramidic crystalline phase RuO₂, at weight ratio of Ru to Ta, ranging from 3 to 5, wherein content of ruthenium oxide in said second layer is greater than in said first layer. Invention also relates to an electrolysis cell and a method of making coated substrate from a valve metal.

EFFECT: use of the proposed group of inventions makes it possible to provide increased period of normal operation of parts in electrolysis units of hydrochloric acid.

8 cl, 3 ex, 3 tbl