4.7 Article

Superior corrosion resistance of high-temperature Ir-Ni-Ta-(B) amorphous alloy in sulfuric acid solution

Journal

CORROSION SCIENCE
Volume 200, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110227

Keywords

Ir-based amorphous alloy; Corrosion resistance; Acid solution; Polarization; Passive films

Funding

  1. National Key Research and Development Program of China [2018YFA0703604, 2018YFA0703602]
  2. National Natural Science Foundation of China [NSFC 52001319, 52071327, 51922102, 52171148]
  3. Youth Innovation Promotion Association CAS, China [2019296]
  4. Natural Science Foundation of Zhejiang Province of China [LR22E010004, LR18E010002]
  5. Ningbo 2025 Science and Technology Innovation Proj-ect, China [2019B10051]
  6. Ningbo Natural Science Foundation, China [202003N4354]

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This study systematically investigated the corrosion behaviors and underlying mechanisms of high-temperature Ir-based amorphous alloys, revealing their excellent corrosion resistance is associated with the formation of a passive film.
In this work, the corrosion behaviors and underlying mechanisms of high-temperature Ir-based amorphous alloys in an acidic solution were investigated systematically. The Ir-Ni-Ta-B amorphous alloy exhibits a crevice corrosion behavior with a superior corrosion resistance characterized by a low passive current density and a wide passive potential range. It is found that the high-exchange current density of H+ and H2 couple on the metalloid constituent can accelerate the active precipitation of passivation elements, leading to rapid formation of passive film. In sulfuric acid solutions, the formed passive film containing Ir, Ta5+ and Ni3+ oxides significantly increase the corrosion resistance.

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