STEEL PIECES MANUFACTURED OF AUSTENITIC OR SEMI-SUBSTANTIAL STEEL IN A PLANT FOR THE PRODUCTION OF SULFURIC ACID AND PROTECTION PROCEDURE AGAINST CORROSION.

摘要

A method for the corrosion protection of at least one piece of steel from a device that is used in a facility to produce sulfuric acid and in which the piece of steel is brought into contact with concentrated sulfuric acid, characterized in that a a concentration of sulfuric acid between 93% by weight and 100% by weight and at a temperature between 140º C and the boiling point of sulfuric acid, the steel part is made of austenitic or semi-austenitic steel that has a content of Cr between 15% by weight and 26.2% by weight, a Ni content of between 9% by weight and 25.2% by weight and a Si content of up to 0.75% by weight , and in which the ratio of the chemical elements (Cr + Si) / (Ni + Mo) is in the band between 0, 9 and 1, 9 or in which the ratio of the chemical elements Cr / (Ni + Mo) is in the band between 0, 8 and 1, 5, and in which the steel part has an an against corrosion, where an anode, a cathode and a reference electrode are connected with a potentiostat that supplies adjustable continuous electric current, and in which the cathode and the reference electrode are in contact with sulfuric acid and the anode It is in contact with the steel part.