| abstract |
(57) [Problem] To use polyethyleneimine or modified polyethyleneimine as a component of a corrosion inhibitor for pickling in pickling at a high temperature where the rust removal rate is high and the pickling treatment is efficient. An object of the present invention is to solve the problem that the corrosion inhibiting effect is significantly reduced. SOLUTION: Polyethyleneimine or modified polyethynimine is combined with cysteamines, cystamines, 1,3- A corrosion inhibitor for pickling, comprising: at least one sulfur-containing compound selected from the group consisting of thiazolidines and 1,3-thiazolidine-2-ones. |