Process for the decontamination of a surface of a component

Details Process for the decontamination of a surface of a component Process for the decontamination of a surface of a component

C - Chemistry, Metallurgy

23

G

C23G 1/08 (2006.01) G21F 9/00 (2006.01) G21F 9/12 (2006.01)

Patent

CA 2350214

The invention relates to a method for decontaminating the surface of a steel component, especially of a low-grade alloy or unalloyed steel. To this end, the surface is contacted with a solution that contains an organic acid. According to the invention, the solution also contains ferrous ions in order to immediately produce a protective coating on a base metal surface which has just been stripped. When the actual decontamination is terminated and the coating layer is no longer needed, the content of these ferrous ions in the solution is reduced so that the coating layer is degraded by normal disintegration. The ferrous ions no longer needed are bound to an ion exchange resin. The ions that have caused the contamination are also bound to said ion exchange resin.

L'invention concerne un procédé de décontamination d'une surface d'un élément en acier, notamment en acier faiblement ou non allié. A cet effet, la surface concernée est mise en contact avec une solution contenant un acide organique. Il est prévu que la solution contienne également des ions de fer bivalent, afin de réaliser immédiatement une couche de protection sur une surface métallique de base dénudée. Lorsque la couche de protection n'est plus requise en fin de décontamination à proprement parler, la teneur en ions de fer est diminuée dans la solution, de manière que la couche de protection soit décomposée par désagrégation normale. Les ions de fer qui ne sont désormais plus nécessaires sont liés sur une résine échangeuse d'ions. Il en est de même avec les ions qui sont à l'origine de la décontamination.

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