Abstract
Fe-based bulk metallic glasses (amorphous metals) have been developed, and several compositions are shown to have excellent corrosion resistance in chloride solutions. Further, thermal-spray amorphous metals are being developed for use as a barrier coating layer, to protect substrate materials from corrosion. Galvanic action between dissimilar metals and the coating/substrate for the amorphous-alloy coatings is of practical interest for a number of applications. The mixed-potential theory provides a useful approach for examining the corrosion behavior of the component materials in the galvanic couple and is applied in this study. Galvanic action was studied for an Fe-based structurally amorphous metal (SAM) 1651 and several crystalline alloys that included 1018 C-steel, stainless steel (SS) 316L, and alloy 22. Anodic and cathodic polarization curves of each of the metals were measured by potentiodynamic polarization. Based on the mixed-potential theory, the behavior of the component materials in a galvanic cell was predicted. The predictions are compared to the measured behavior of galvanic couples with the crystalline alloys.
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Acknowledgments
The authors acknowledge the preparation and provision of the SAM 1651 samples by the Oak Ridge National Laboratory, Oak Ridge, TN, courtesy of William Peter and Craig Blue. The work is carried out under the United States Department of Energy (DOE), Corrosion and Materials Performance Cooperative, under DOE Cooperative Agreement No. DE-FC28-04RW12252. The work is in support of the Defense Advanced Research Projects Agency, Defense Science Office, and the DOE Science and Technology Program, Office of the Chief Scientist, Office of Civilian Radioactive Waste Management, for the development of the corrosion resistance of iron-based amorphous metal coatings, under the direction of Dr. J.C. Farmer, at the Lawrence Livermore National Laboratory. The authors also acknowledge the Vietnam Education Foundation for its financial support to one of the authors (HH) during the study.
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This article is based on a presentation given in the symposium entitled “Iron-Based Amorphous Metals: An Important Family of High-Performance Corrosion-Resistant Materials,” which occurred during the MSandT meeting, September 16–20, 2007, in Detroit, Michigan, under the auspices of The American Ceramics Society (ACerS), The Association for Iron and Steel Technology (AIST), ASM International, and TMS.
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Ha, H.M., Payer, J.H. Examination of Galvanic Action between Fe-Based Bulk Metallic Glass and Crystalline Alloys. Metall Mater Trans A 40, 1334–1343 (2009). https://doi.org/10.1007/s11661-008-9653-8
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DOI: https://doi.org/10.1007/s11661-008-9653-8