| 摘要 |
PURPOSE:To provide an acid corrosion inhibitor for iron-base metal showing its effect even at a high temp. by using a compound produced by introducing a propargyl group into a benzothiazolone compound and represented by a specified general formula. CONSTITUTION:An acid corrosion inhibitor for iron-base metal is made of a compound produced by introducing a propargyl group into a benzothiazolone compound at the 3-position and represented by the general formula (where X is H, halogen, lower alkyl, lower alkoxy or amino, and n is 1-2). For example, 3- propargylbenzothiazolone is used. When the inhibitor is added to an acid soln. by about 0.01-5.0wt%, preferably about 0.05-1.0%, the dissolution of iron-base metal in the soln. is stably inhibited independently of the temp. of the soln. The inhibitor is added to an inorg. acid such as sulfuric acid or hydrochloric acid or an org. acid such as acetic acid or citric acid for pickling which is carried out in the manufacture of iron or stainless steel or for the chemical cleaning of a chemical plant or the like. |
