View in EDS

The corrosion behavior of sintering micro-porous Ni–Cu alloy in hydrofluoric acid solution.

Saved in:
Bibliographic Details
Title: The corrosion behavior of sintering micro-porous Ni–Cu alloy in hydrofluoric acid solution.
Authors: Yu, Linping1,2, Jiang, Yao1, He, Yuehui1 yuehui@csu.edu.cn, Liu, C.T.3
Source: Journal of Alloys & Compounds. Jul2015, Vol. 638, p7-13. 7p.
Subjects: Nickel alloys, Sintering, Porous metals, Copper alloys, Hydrofluoric acid, Acid solutions, Corrosion in alloys
Abstract: The porous Ni–Cu alloy with different porosity was fabricated through mixed elemental powders reaction synthesis by step sintering in vacuum furnace. The corrosion resistance and corrosion mechanism of the sintered porous Ni–Cu alloy in hydrofluoric acid (HF) were investigated by the immersion test, the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) techniques. Results show that the sintered porous Ni–Cu alloy exhibits good corrosion resistance in hydrofluoric acid solution, compared with porous Ni. The corrosion rate of the sintered porous Ni–Cu is dependent upon the concentration of hydrofluoric acid solution, no passive phenomenon is found in potentiodynamic polarization curve in any concentration. Double capacitive loops for the porous Ni–Cu alloy in EIS results show that the corrosion process is controlled by electrochemical reaction. Moreover, the porosity has little influence on the corrosion resistance of the sintered porous Ni–Cu alloy in hydrofluoric acid solution, which is most likely due to the homogenous pore structure and chemical composition of the material, as well as the chemical stability of the bulk alloy itself. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The porous Ni–Cu alloy with different porosity was fabricated through mixed elemental powders reaction synthesis by step sintering in vacuum furnace. The corrosion resistance and corrosion mechanism of the sintered porous Ni–Cu alloy in hydrofluoric acid (HF) were investigated by the immersion test, the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) techniques. Results show that the sintered porous Ni–Cu alloy exhibits good corrosion resistance in hydrofluoric acid solution, compared with porous Ni. The corrosion rate of the sintered porous Ni–Cu is dependent upon the concentration of hydrofluoric acid solution, no passive phenomenon is found in potentiodynamic polarization curve in any concentration. Double capacitive loops for the porous Ni–Cu alloy in EIS results show that the corrosion process is controlled by electrochemical reaction. Moreover, the porosity has little influence on the corrosion resistance of the sintered porous Ni–Cu alloy in hydrofluoric acid solution, which is most likely due to the homogenous pore structure and chemical composition of the material, as well as the chemical stability of the bulk alloy itself. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2015.01.281