Method for Increasing the resistance to localized Corrosion of Zirconium Alloys applicable to passivating Solution, applied to the same and passivation of ZR Alloy material obtained by Said method

摘要

A method for Increasing the resistance to localized Corrosion of Zirconium Alloys applicable to, especially under hydrothermal conditions in the presence of organic acids and halides.That includes the steps of: a) preparing surfaces by mechanical polishing and scouring; (b) to closely contact the metal surface treated with a Solution comprising an organic Solvent of aliphatic alcohols, Organic Acids containing one or more dic Arboxu00edlicos or salts thereof, or mixtures thereof,Even pH between about 4 and about 9, and temperature; (c) to apply on a scheduled and controlled potential Cycling up to approximately + 1.2 V and about - 1.2 V for a current density of approximately 15 mA / cm2 aproximadame Nte 25 mA / cm2 of the Surface to be treated and a counter Electrode, Stainless SteelDuring a period of approximately two hours to approximately 15 hours, and the whole process in a single phase and temperature; (d) to finalize the process when there is a decrease of the electrical current flowing between the material to be treated and the contraelect Rolled up to a constant value.Usually in the Order of 10 mA / cm2; and e) wash the material treated with DISTILLED WATER. Passivating solution to implement the procedure described and passivation Zirconium Alloy material obtained thereby.