METHOD FOR PASSIVATING A NICKEL-ALLOY ELEMENT, ELEMENT OBTAINED BY SAID METHOD, AND METHOD FOR MANUFACTURING AN ASSOCIATED PRIMARY CIRCUIT OF A NUCLEAR REACTOR

摘要

The invention relates to a method (120) for passivating an element made of a nickel alloy, which is intended for limiting the corrosion and the cation release of said element in contact with a liquid. The method comprises a step of applying a thermal treatment (126) to at least one surface of the element, the thermal treatment (126) being carried out at a temperature of 500°C to 900°C, in an inert atmosphere made up of at least 99.9% of an inert gas or a mixture of inert gases. The inert atmosphere is at a pressure substantially equal to atmospheric pressure, and the thermal treatment (126) is carried out during a time ranging from ten to fifty hours.