Unexpected corrosion problems that arose in a crystn. plant with evaporators made entirely of type 316L (UNS S31603) stainless steel (SS) were solved using a corrosion inhibitor system of EDTA (EDTA)-hydroxylamine sulfate (SI)-iron anions (Fe2+). An exptl. statistical plan reduced the no. of expts. needed to optimize the concn. of EDTA-SI-Fe2+. Moreover, the plan allowed more rapid and economical study of the action of each component in the inhibition mechanism. Statistical processing of the data collected from the potential-vs.-time, anodic, and cathodic potentiodynamic measurements permitted estns. of the influence of each independent variable (EDTA, SI, and Fe2+- concns.). Voltammetric, polarog., anodic potentiodynamic curves, and Flade potential measurements helped further understanding of the inhibiting system.
EDTA-hydroxylamine sulfate-Fe2+: an efficient corrosion inhibitor system for an industrial crystallization plant
TONIOLO, Luigi
1994-01-01
Abstract
Unexpected corrosion problems that arose in a crystn. plant with evaporators made entirely of type 316L (UNS S31603) stainless steel (SS) were solved using a corrosion inhibitor system of EDTA (EDTA)-hydroxylamine sulfate (SI)-iron anions (Fe2+). An exptl. statistical plan reduced the no. of expts. needed to optimize the concn. of EDTA-SI-Fe2+. Moreover, the plan allowed more rapid and economical study of the action of each component in the inhibition mechanism. Statistical processing of the data collected from the potential-vs.-time, anodic, and cathodic potentiodynamic measurements permitted estns. of the influence of each independent variable (EDTA, SI, and Fe2+- concns.). Voltammetric, polarog., anodic potentiodynamic curves, and Flade potential measurements helped further understanding of the inhibiting system.
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