Process for Protecting stainless steel against corrosion by acid and an aqueous solution of acid organosulfonico organosulfonico useful in dichoproceso.

摘要

Process to avoid the Corrosion of stainless steel in acid Medium organosulfonico, Add the medium includes at least a agenteoxidante selected from oxides or salts,NITRITE and persulphates CERIUM (iv), Iron (iii), MOLYBDENUM (VI) or VANADIUM (V) in an amount sufficient parasituar The Spontaneous Potential between the passivation potential and transpasivacion.The Nature of the oxidation Agent chosen is not critical in the process. An alkali metal NITRITE can be used, preferably Sodium nitrite.CERIUM (iv) can be used in the form of a double Salt deamonio CERIUM (iv) preferably Nitro or Cerium AMMONIUM SULFATE.The Salt of MOLYBDENUM (VI), preferably SODIUM MOLYBDATE can be associated with Lasalde CERIUM (iv).Another object of the invention is an aqueous solution containing at least organosulfonico acid or an oxidizing Agent Selected entreoxidos salts, nitrites and persulphates CERIUM (iv)Iron (iii), MOLYBDENUM (VI) or VANADIUM (V), in an amount sufficient for his potencialespontu00e1neo, measured using a Stainless Steel electrode.Within the area of passivation determined under the same conditions The absence of oxidizing Agent.