Corrosion behavior of Mg-Gd-Zn based alloys in aqueous NaCl solution

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • A. Srinivasan
  • C. Blawert
  • Y. Huang
  • C. L. Mendis
  • K. U. Kainer
  • N. Hort

The corrosion behavior of Mg-10Gd-xZn (x = 2, 6 wt.%) alloys in 0.5 wt.% NaCl solution was investigated. Microstructures of both the alloys consisted of (Mg,Zn)3Gd phase and lamellar long period stacking ordered (LPSO) phase. The morphology of the second phase at the grain boundary differed in both alloys: it was a continuous network structure in Mg-10Gd-6Zn, whereas it was relatively discrete in Mg-10Gd-2Zn. The dendrites were finer in size and highly branched in Mg-10Gd-6Zn. The corrosion results indicated that the increase in Zn content increased the corrosion rate in Mg-10Gd-xZn alloys. Micro-galvanic corrosion occurred near the grain boundary in both alloys initially as the grain boundary phase was stable and acted as a cathode, however, filiform corrosion dominated in the later stage, which was facilitated by the LPSO phase in the matrix. Severe micro-galvanic corrosion occurred in Mg-10Gd-6Zn due to the higher volume of second phase. The stability of the second phase at the grain boundary was altered and dissolved after the long immersion times. Probably the NaCl solution chemically reacted with the grain boundary phase and de-stabilized it during the long immersion times, and was removed by the chromic acid used for the corrosion product removal.

Original languageEnglish
JournalJournal of Magnesium and Alloys
Volume2
Issue number3
Pages (from-to)245-256
Number of pages12
ISSN2213-9567
DOIs
Publication statusPublished - 01.09.2014
Externally publishedYes

    Research areas

  • Electrochemical characterization, Mg-Gd-Zn alloys, Micro-galvanic corrosion, Polarization
  • Engineering

Recently viewed

Researchers

  1. Stefan Schröder

Publications

  1. Die Computerspielnutzung Heranwachsender aus Elternsicht unter dem Blickwinkel der Habitustheorie
  2. Remote sensing
  3. The Manager’s Job at BP
  4. A guide to training your own horses
  5. Education for Sustainable Consumption through Mindfulness
  6. The motivational benefits of specific versus general optimism.
  7. § 175
  8. Do high incomes reflect individual performance?
  9. Of sustainability and storytelling - An introduction to this book
  10. From Critique to Problems and the Politics of the In-act with Bergson, Deleuze and James
  11. Exploring teachers' mental health literacy: An exploratory study on teachers' experiences, cooperation partners, self-efficacy, and knowledge related to students' mental health problems
  12. Ground Truthing in Digital Technoculture
  13. Ästhetische Spannung als Zukunftsungewissheit?
  14. Indigenous and Local Communities' initiatives have transformative potential to guide shifts toward sustainability in South America
  15. Corporate Volunteering als Instrument zur strategischen Implementierung von Corporate Social Responsibility
  16. Postretirement Career Planning
  17. Exports, R&D and productivity: a test of the Bustos-model with German enterprise data
  18. Expatriate Management
  19. Gesundheit im Unternehmen
  20. Sustainable software products—Towards assessment criteria for resource and energy efficiency
  21. Camouflagen des Computers
  22. ‘A Spinozist Sort of Solidarity: From Homo-Nationalism to Queer Internationalism’, in: "Interface: a journal for and about social movements", Volume 6, Issue 2 (November 2014) pp.224-229
  23. An environmentally friendly procedure to obtain flavonoids from Brazilian citrus waste
  24. Ethik
  25. Ecosystem services and sustainability: descriptive means, normative goals and societal transformations