Process for real-time detection and inhibition of localized...

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G01N 17/02 (2006.01) G01N 27/26 (2006.01)

Patent

CA 2409941

This invention describes a novel means of determining the nature (type) of corrosion in real-time. By identifying localized corrosion at the moment of pit initiation, real-time selection, and effective concentration(s) of approriate inhibitor(s) can be delivered to an electrolytic solution before propagation of the localized corrosion. Integrating this information with a corrosion inhibitor feed system can effectively inhibit the corrosion before propagation occurs, thereby maintaining system integrity. The process embodies a method of operation wherein the electrochemical noise (ECN) and linear polarization (LPR) values are processed to compare how the corrosion signals correlate. Divergence of the corrosion rates indicates the formation of localized corrosion while continuity in signal pattern indicates generalized corrosion.

Cette invention se rapporte à un nouveau moyen permettant de déterminer la nature (le type) d'une corrosion en temps réel. En identifiant une corrosion localisée au moment du début d'une fissuration, on peut effectuer un choix en temps réel d'un ou de plusieurs inhibiteurs appropriés et on peut introduire une ou des concentrations efficaces de ces inhibiteurs dans une solution électrolytique, avant la propagation de la corrosion localisée. En intégrant ces informations dans un système d'amenée d'inhibiteur de corrosion, on peut empêcher efficacement la corrosion avant sa propagation, préservant ainsi l'intégrité du système. Ce procédé utilise un mode opératoire dans lequel les valeurs de bruit électrochimiques (ECN) et de polarisation linéaire (LPR) sont traitées pour comparer le mode de corrélation des signaux de corrosion. Une divergence entre les vitesses de corrosion indique la formation d'une corrosion localisée, alors qu'une continuité de l'aspect du signal indique une corrosion généralisée.

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