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

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)
    31 Downloads (Pure)

    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

    Bibliographical note

    Accepted Author Manuscript

    Keywords

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

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