An application of electrochemical method for studying nano-composite plating |
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Authors: | Nguyen Ngoc Phong Ngo Thi And Tuyet Do Chi Linh Nguyen Viet Hue Sik Chol Kwon Man Kim Joo Yul Lee |
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Affiliation: | (1) Metal Corrosion Department, the Institute of Materials Science (IMS), 18, Hoang Quoc Viet, 10000 Hanoi, Vietnam;(2) Surface Engineering Department, the Institute of Machinery and Materials (KIMM), 66, Sangnam-dong, Changwon-si, 641-010 Gyeongnam, Korea |
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Abstract: | Nickel plating is investigated using an electrochemical method in this study. Cathodic polarization indicated that electrode
polarization at a current density of 10−1 A/cm2 increased by approximately 100 mV in a pH range 3–5, and by nearly 150 mV with 1 g/L of carbon powder in a Watts solution,
as compared to bare nickel. The influence of inert particles such as carbon powder, silicon carbide and rice husk ash included
in the nickel deposit was studied further using a potentiodynamic technique. Results showed that a co-deposit of nano-particles
increased cathodic polarization. With a three-fold increase of the carbon powder in the plating solution, the polarization
potential of the nickel deposit was doubled at a current density of 10−2 A/cm2. Passivation of the nickel deposit in the presence of all of the inert particles studied was improved in the area of hundreds
of times higher compared to a bare nickel deposit. By increasing the amount of inert particles to twenty times the original
amount, the passive current density was decreased by 85–95%. A co-deposit of rice husk ash in the nickel deposit decreased
the passive current density by 98%, compared to a carbon and silicon carbide powder. Thus, rice husk ash has the potential
to improve the pitting corrosion resistance of nickel composite plating. |
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Keywords: | Nano-composite plating electrochemical methods nano-sized particles corrosion wear |
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