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Effects of Electroplating Variables on Characteristics of Re-Ir-based Alloy Films in Citrate Aqueous Solutions with Low pH of 2.0~2.5
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Electrochemistry and Corrosion Laboratory, School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China

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    Abstract:

    The characteristics of (Re+Ir)-rich Re-Ir-Ni alloy films electroplated galvanostatically from citrate aqueous solutions with low pH of 2.0~2.5 were investigated. The effects of electroplating variables and bath chemistry on surface morphology, chemical composition and crystallographic structure of the films were studied. The morphology, composition and phase of the alloy films were characterized by environmental scanning electron microscopy, X-ray energy dispersive spectroscopy and X-ray diffraction, respectively. The results show that a dense and bright Re-Ir alloy file is obtained under the conditions of current density of 60 mA·cm-2 and pH=2.0. Increasing temperature results in good quality of the alloys at pH=2.5, but at pH=2.0 the result is opposite. The films deposited at bath temperatures of 60~70 °C and pH=2.0 consist of amorphous phase. At bath temperature of 80 °C, the films consist of ReO3 phase. At current density of 60 mA·cm-2, the crystallographic structure of the film changes from an amorphous phase to a mixture of crystalline and amorphous phases when pH is increased from 2.0 to 2.5. The phases of crystalline are hcp-Ir0.4Re0.6 and hcp-Ni.

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[Wu Wangping. Effects of Electroplating Variables on Characteristics of Re-Ir-based Alloy Films in Citrate Aqueous Solutions with Low pH of 2.0~2.5[J]. Rare Metal Materials and Engineering,2021,50(12):4319~4326.]
DOI:10.12442/j. issn.1002-185X.20200769

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History
  • Received:October 06,2020
  • Revised:November 11,2020
  • Adopted:December 14,2020
  • Online: December 30,2021
  • Published: December 24,2021