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


Aksu Y., ERDOĞAN M. , Demirci G., KARAKAYA İ.

Symposium on Industrial Electrochemistry and Electrochemical Engineering General Session held during the 229th Meeting of The Electrochemical-Society, California, Amerika Birleşik Devletleri, 29 Mayıs - 02 Haziran 2016, cilt.72, ss.13-21 identifier identifier

  • Cilt numarası: 72
  • Doi Numarası: 10.1149/07222.0013ecst
  • Basıldığı Şehir: California
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.13-21

Özet

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.