Electrochemical Impedance Behavior Of Various Composition Quaternary Ni Alloy In 3.5 wt% NaCl

Zainal Abidin, Muhammad Zaimi and Mohd Abid, Mohd Asyadi 'Azam and Sofian, Azizul Helmi and Kazuhiko, Noda (2015) Electrochemical Impedance Behavior Of Various Composition Quaternary Ni Alloy In 3.5 wt% NaCl. Applied Mechanics And Materials, 761. pp. 407-411. ISSN 1662-7482

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Zinc and copper addition into electroless Ni-P alloy matrix produces quaternary Ni alloy that exhibits lower corrosion resistance behavior compared to Ni-P and Ni-Cu-P alloy in 3.5 wt% NaCl solution. The corrosion behavior of the alloy is previously studied using the anodic polarization curve measurement. The results show that the corrosion potential of different alloy composition is almost similar to each other for electroless Ni-Zn-Cu-P alloy. However, the surface resistance of the alloy needs to be confirmed by using electrochemical impedance spectroscopy. The alloy was first deposited on an iron substrate using electroless Ni alloy deposition method approximately similar thickness at different plating bath pH of 8.50 and 9.50. The Ni alloy coated substrate was used as working electrode immersed into a solution of 3.5 wt% NaCl. The electrochemical cell consists of Pt and Ag/AgCl/KCl (saturated) as counter and reference electrode respectively. Electrochemical impedance measurement was done at open circuit potential. The measurement started from 100 kHz to 10 mHz with 10 mV of sinusoidal perturbation applied to the cell. Other types of alloy including Ni-P, Ni-Cu-P and Ni-Zn-P, were compared with Ni-Zn-Cu-P alloy. From the results, the Ni-Zn-Cu-P exhibits the lowest corrosion behavior compared to other Ni alloy due to low charge transfer resistance (Rct) observed small inductive loop at low frequency region of the Nyquist plot. Furthermore, the Nyquist plot for Ni-Zn-Cu-P for pH 8.50 and 9.50 showed comparable result; hence, the effect of pH has less effect on corrosion resistance of the electroless Ni-Zn-Cu-P alloy.

Item Type: Article
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Manufacturing Engineering > Department of Engineering Materials
Depositing User: Mohd. Nazir Taib
Date Deposited: 07 Nov 2018 08:18
Last Modified: 07 Nov 2018 08:18
URI: http://eprints.utem.edu.my/id/eprint/21265
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