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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/039/03/0749-0757

    • Keywords

       

      Pigments; paints; corrosion protection; synergism.

    • Abstract

       

      The present work depicts synergism anticorrosive behaviour between zinc hypophosphite and zinc phosphate in a commercial pigment mixture. Also, the performance of anticorrosive paints was evaluated. Synergism anticorrosive behaviour was evaluated by corrosion potential and linear polarization measurements in pigment suspensions. The protective layer obtained with this pigment mixture was investigated by scanning electron microscopy (SEM). Then, the anticorrosive properties of the pigment were assessed by incorporating it into alkyd and epoxy paints which were evaluated by salt spray test and electrochemical noise technique. The morphology and the nature of the protective layer grown under the paint film were also studied by SEM. Experimental results showed that improved anticorrosion protection is achieved in paints with reduced zinc phosphate contents as a consequence of the synergistic interaction between zinc hypophosphite and the other components of the pigment mixture. The electrochemical noise technique proved to be adequate to monitor corrosion in painted panels and is able to detectcorrosion under the paint film from very early stages. This paper identified the need to study synergism between anticorrosive pigments to try to reduce the phosphate content in anticorrosive paints.

    • Author Affiliations

       

      G BLUSTEIN1 2 C DEYÁ1 2 R ROMAGNOLI1 2

      1. CIDEPINT (CONICET–CICPBA): Centro de Investigación y Desarrollo en Tecnología de Pinturas, Calle 52e/121 y 122, (B1900AYB), La Plata 1900, Argentina
      2. Universidad Nacional de La Plata, La Plata 1900, Argentina
    • Dates

       

© 2017 Indian Academy of Sciences, Bengaluru.