FIELD: chemistry.
SUBSTANCE: method includes etching of sediments with a purification solution, which has pH of 4-5 and contains g/l: 10-15 hydrochloric acid, 10-15 orthophosphoric acid, not less than 3-5 complexon in the form of ethylenediaminetetraacetic acid (EDTA) or 1-hydroxyethylidene diphosphonic acid (HEDP), 0.5-1 UCP urotropin condensation product and ethanolamine with chlorine benzine, 0.4-1 alizarin oil, and the remaining part - water.
EFFECT: effective removal of sediments from the metal surface and the invariability of initial physical-chemical properties of the metal surface, reduction of corrosion loss and increase of ecological safety of processing.
3 cl, 5 dwg
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