| 摘要 |
PURPOSE:To inhibit the trouble of H2S formed by decomposition of thioglycolic acid by making combination use of hydrazine, etc. and an acid corrosion inhibitor with a cleaning liquid of mixed org. acids contg. thioglycolic acid. CONSTITUTION:A soln. mixture formed by using >=1 kind among hydrazine, L-ascorbic acid and erysorbic acid and an acid corrosion inhibitor in combination with an acid soln. mixture consisting of >=1 kind among citric acid, glycolic acid, gluconic acid, malic acid and formic acid and thioglycolic acid is prepd. If the iron oxide scale formed on the surface of a ferrous metal is cleaned by using such soln., the iron oxide scale can be dissolved away effectively without problem. The acid corrosion inhibitor provides the effect of inhibiting corrosion of the steel material by exhibiting an adsorption effect on the cleaned surface and is enumerated by an org. amine inhibitor. |
