| abstract |
In a descaling / rust preventive agent using organic phosphonic acid or a salt thereof, the derusting effect is enhanced, the degree of corrosion is reduced, and the surface finish of the metal to be cleaned after derusting is improved. A scale removing / rust preventive agent comprising the following components (A) to (C). (A) component: 1 or more types chosen from organic phosphonic acid and its salt. (B) component: 1 or more types chosen from carboxylic acid and its salt. (C) component: 1 or more types chosen from mercaptocarboxylic acid and its salt. [Selection figure] None |