Electropolishing of an Fe-Ni-Co Alloy in Acetic Acid-Perchloric Acid Mixture

Date

2016-06-02

Author

Aksu, Yasemin
ERDOĞAN, METEHAN
Demirci, Gokhan
Karakaya, İshak

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Among Fe-Ni-Co alloys, Kovar (53%Fe-29%Ni-17%Co) designated as ASTM F-15 (1), is a well-known glass-sealing alloy. It is also classified as low–expansion alloy (2). Low expansion is required to avoid internal stresses in applications that involve strong ceramic to metal joining such as in vacuum systems (3-6). Electropolishing is applied to obtain smooth metallic surfaces to gain low outgassing rates from the chamber walls in vacuum applications (7-9). The effects of current density, perchloric acid concentration and bath temperature on surface roughness and thickness change were investigated in acetic acid-perchloric acid electrolyte. It was found that current density, perchloric acid concentration and temperature of the bath had a decreasing influence on surface roughness in the given order. On the other hand, thickness change was found to have a direct correlation with the current density and was independent of bath concentration and temperature

Subject Keywords

General Engineering

URI

https://hdl.handle.net/11511/36624

DOI

https://doi.org/10.1149/07222.0013ecst

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

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Citation Formats

Y. Aksu, M. ERDOĞAN, G. Demirci, and İ. Karakaya, “Electropolishing of an Fe-Ni-Co Alloy in Acetic Acid-Perchloric Acid Mixture,” 2016, vol. 72, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36624.