Molybdate as corrosion inhibitor for hot dip galvanised steel scribed to the substrate
A study based on global and localised electrochemical approaches
L. B. Coelho (Université de Mons)
E. B. Fava (Universidade Federal de Santa Catarina)
Agnieszka Kooijman (TU Delft - (OLD) MSE-6)
Yaiza Gonzalez-Garcia (TU Delft - (OLD) MSE-6)
M. G. Olivier (Materia Nova asb, Université de Mons)
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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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