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Title: Corrosion inhibition of carbon steel in open recirculating cooling water system of petroleum refinery by a multi-component blend containing zinc (II) diethyldithiocarbamate
Authors: Gogoi, P K
Barhai, B
Keywords: Corrosion
Scale inhibitors
Open recirculating cooling system
Zinc (II)
Sodium diethyldithiocarbamate
Issue Date: Jul-2010
Publisher: CSIR
Abstract: A multi-component blend of inhibitors containing sodium salt of diethyldithiocarbamate (DEDTC) (50 to 100 ppm), Zn2+as ZnSO4.7H2O (50 to 70 ppm) and 1-hydroxy ethyledene-1,1-diphosphonic acid (HEDP) (50 to 150 ppm) was formulated as corrosion and fouling inhibitor for carbon steel in open recirculating cooling water system of Numaligarh Refinery Limited (NRL), Golaghat, Assam and evaluated by weight loss and potentiodynamic polarization methods. The results showed that each of NaDEDTC, HEDP and ZnSO4.7H2O in 1.0:1.4:1.0 ratios can significantly decrease corrosion, scale build-up and microbial growth under the test condition. Potentiodynamic polarization curves indicate both cathodic and anodic corrosion inhibition. SEM and EDS studies indicate the formation of an adsorbed protective film containing of Fe2+-HEDP, Zn2+-HEDP, Zn2+-DEDTC complexes on the metal surface.
Page(s): 291-295
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.17(4) [July 2010]

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