Molybdate as corrosion inhibitor for hot dip galvanised steel scribed to the substrate

A study based on global and localised electrochemical approaches

Journal article (2020)

Authors

L. B. Coelho Université de Mons

E. B. Fava Federal University of Santa Catarina

A.M. Kooijman (OLD) MSE-6

Y. Gonzalez Garcia (OLD) MSE-6

M. G. Olivier Université de Mons, Materia Nova asb

Research Group

(OLD) MSE-6

DOI: https://doi.org/10.1016/j.corsci.2020.108893

A. Mild steel A. Zinc C. Cathodic protection C. Interfaces C. Neutral inhibition

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Published Date

2020

Language

English

Research Group

(OLD) MSE-6

Abstract

The effect of sodium molybdate in inhibiting galvanic corrosion of Zn coating and mild steel is addressed. The inhibitor's performance was appraised by Zero Resistance Ammeter on HDG/mild steel galvanic coupling model in 0.05 M NaCl (+5 mM Na₂MoO₄) media. The effectiveness of Na₂MoO₄ was evaluated on HDG substrate mechanically scratched to reach the steel. Scanning Vibrating Electrode Technique was employed for assessing the distribution of j from scribed HDG surfaces. This local electrochemistry approach was repeated in NaCl solution to examine the behaviour of HDG when the Zn-coating is partially removed. Surface analysis supported all electrochemical results.

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