Comparative Analysis of the Synergistic Effect of Sodium Molybdenum Oxide and Vanillin on the Corrosion Inhibition of 3CR12 Ferritic Stainless Steel and High Carbon Steel in Dilute Hydrochloric Acid
No Thumbnail Available
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Springer International Publishing Switzerland
Abstract
Description
Analysis of the synergistic effect of sodium
molybdenum oxide and vanillin on the corrosion inhibition
of high carbon steel and 3CR12 ferritic stainless steel in
2M HCl solution was done through coupon measurement,
potentiodynamic polarization test and IR spectroscopy.
Results show the admixture compound inhibited the corrosion
of both steels, but performed more effectively on
3CR12 ferritic steel with average inhibition efficiency
above 90% while the average inhibition efficiency of the
compound on carbon steel was around 75%. Polarization
studies showed mixed inhibiting properties of the compound
on the carbon steel and anodic corrosion inhibition
on the ferritic steel. The compound adsorbed over the
entire carbon steel surface, but selectively precipitates at
anodic sites on the stainless steel surface due to the passivation
characteristics of the steel. Chemisorption mechanism
was determined from thermodynamic calculations to
be the mode of inhibition on the steels through the Langmuir
adsorption isotherm. Infrared spectroscopy exposed
the presence of the functional groups and bonds such as
alcohols, phenols, primary and secondary amines and
amides within the compound responsible for corrosion
inhibition.
Keywords
T Technology (General), TJ Mechanical engineering and machinery