COMPOSITION FOR DISSOLUTION / REMOVAL OF CORROSIVE DEPOSITS Russian patent published in 2020 - IPC C09D9/04 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical reagents used to dissolve deposits of water-insoluble iron oxides and hydroxides, so-called rust formed on solid surfaces of different materials, including metal, ceramic, stone, brick, concrete and similar materials. Described is a composition for dissolving corrosive deposits, containing hydrochloric acid, an acid inhibitor in form of a substance selected from triethanolamine, dimethylethanolamine, triethylamine, diethylethanolamine, diisopropylethylamine and diisopropylethanolamine, nonionic surfactant containing a mixture of isoalkyl ethers of polyethylene glycol with the number of repeating units [CH2-CH2-O] from 5 to 25 – isopropyl ether of polyethylene glycol, polyethylene glycol isobutyl ether or polyethylene glycol isopentyl ether, or in form of polyoxyethylene tridecyl ether (tridecyl ether of polyethylene glycol) with number of repeating units [CH2-CH2-O] – 18 and water, which is characterized by the following ratio of components, wt%: hydrochloric acid – 15.0–45.0; acidic inhibitor – 5.0–20.0; surfactant 0.5–4.0; water – balance. Also disclosed is a version of the composition for dissolving corrosive deposits.

EFFECT: high rate of dissolving corrosive deposits when using a composition for treating a solid surface.

4 cl, 16 ex