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Galvanic Interactions of 15CDV6/MDN138 & 15CDV6/MDN250 Alloys in Natural Seawater

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Abstract

The galvanic corrosion behavior of the metal combinations 15CDV6/MDN138 and 15CDV6/MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI’s Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250, and 15CDV6 of the individual metal, the galvanic potential and galvanic current of the couples 15CDV6/MDN138 and 15CDV6/MDN250, were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with 15CDV6 were analyzed using XRD. The electrochemical behavior of MDN138, MDN250, and 15CDV6 in seawater was studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with 15CDV6 have been examined with a scanning electron microscope. The results of the study reveal that the galvanic protection offered by 15CDV6 to MDN250 and MDN138 in natural seawater amounts to 93% and 98%, respectively, implying that the galvanic protection offered by 15CDV6 is continuous and effective, which has been further evinced from the adherent nature of the calcareous deposit film comprising compounds such as CaCO3 (calcite, aragonite, and vaterite), MgCO3 (magnesite), Mg(OH)2 (brucite), and MgO (brucite).

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Acknowledgements

The authors wish to thank the Director, CSIR-Central Electrochemical Research Institute, Karaikudi, for permission and encouragements.

Funding

This study has been financially supported by Project Director, DRDL, Hyderabad, India (Project No. SSP 0709).

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Authors and Affiliations

  1. Defence Research Development Laboratory, Hyderabad, 500 058, India

    P. Ramakrishna rao

  2. CSIR-Central Electrochemical Research Institute, Karaikudi, 630 003, India

    G. T. Parthiban & K. Muthuraman

  3. Corrosion Testing Centre, CSIR-CECRI Unit, , Mandapam Camp, 623 519, India

    G. Subramanian

Authors
  1. P. Ramakrishna rao
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  2. G. T. Parthiban
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  3. G. Subramanian
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  4. K. Muthuraman
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Corresponding author

Correspondence to G. Subramanian.

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Article Highlights

• The galvanic corrosion behavior of the metal combinations 15CDV6/MDN138 and 15CDV6/MDN250, with 1:1 area ratio, has been studied in natural seawater.

• The galvanic protection offered by 15CDV6 to MDN250 and MDN138 in natural seawater amounts to 93% and 98%, respectively.

• The adherent nature of the calcareous deposit film comprising compounds such as CaCO3 (calcite, aragonite, and vaterite), MgCO3 (magnesite), Mg(OH)2 (brucite), and MgO (brucite), also favors the extent of galvanic protection.

• Electrochemical polarization study reveals that MDN138 alloy is more corrosion resistant than MDN250 alloy.

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rao, P.R., Parthiban, G.T., Subramanian, G. et al. Galvanic Interactions of 15CDV6/MDN138 & 15CDV6/MDN250 Alloys in Natural Seawater. J. Marine. Sci. Appl. 18, 239–245 (2019). https://doi.org/10.1007/s11804-019-00092-8

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  • DOI: https://doi.org/10.1007/s11804-019-00092-8

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