Abstract
The author investigated the corrosion inhibitor effect of Urotropin in various conditions of acid cleaning and following results were obtained.
(1) Urotropin exhibited the sufficient inhibitor effect at the concentration of 0.1-0.2%, and the effect was influenced little by concentration of acid and the area of steel.
(2) Urotropin exhibited the corrosion inhibitor action to steel also in a hot acid solution, but on heating the solution contained Urotropin to above 40°C the corrosion loss of steel increased. Then it was desirable that Urotropin was used in the acid solution below 40°C.
(3) Urotropin exhibited the same large inhibitor effect both in the hydrochloric acid and the sulphuric acid solution, but the smaller in the phosphoric acid solution and had none in the nitric acid solution.
(4) The corrosion inhibitor effect of Urotropin had no relation almost to all kinds of iron and steel.
