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, E. B. Fava, A. M. Kooijman, Y. Gonzalez-Garcia, M. G. Olivier

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Article number108893
Number of pages16
JournalCorrosion Science
Volume175
DOIs
Publication statusPublished - 2020

Keywords

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

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