High-performance polyvinylpyrrolidone capped copper coatings via ultrasonic-assisted supercritical-CO2 electrodeposition: Electrochemical evaluation

• Published in: Surface & coatings technology Vol. 409; p. 126926
• Main Authors: Pandiyarajan, Sabarison, Hsiao, Po-Ju, Liao, Ai-Ho, Ganesan, Muthusankar, Huang, Sheng-Tung, Chuang, Ho-Chiao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15-03-2021; Elsevier BV
• Subjects: Carbon dioxide; Cavitation; Charge transfer; Coated electrodes; Coatings; Copper; Corrosion; Corrosion resistance; Diamond pyramid hardness tests; Electrochemical analysis; Electrode polarization; Electrodeposition; Emission analysis; Field emission microscopy; Flow velocity; Impedance; Metal-polymer composite; Performance enhancement; Polyvinylpyrrolidone; Supercritical-CO2; Ultrasonic agitation; United States > US; Supercritical-CO2; Electrodeposition; Corrosion; Impedance; Metal-polymer composite
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2021.126926

The effect of electrodeposition conditions and their influence in electrochemical performance of copper/polyvinylpyrrolidone (Cu/PVP) composite were investigated and reported here. Initially, the electrochemical performance of the pure Cu coating and the fabricated Cu/PVP composites prepared under conventional method was scrutinized, and the results reveal the enhanced performance of Cu/PVP composite coating when compared to the pure Cu coatings. To improve the deposition quality of Cu/PVP composite coatings, we have utilized two different electrodeposition conditions such as supercritical-CO2 (SC-CO2) and ultrasonic-assisted supercritical-CO2 (US-SC-CO2) conditions. Then the samples were characterized using field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Vickers' hardness test, charge transfer resistance analysis, and corrosion analysis. The corrosion behavior was analyzed through impedance and potentiodynamic polarization techniques in 3.5 wt% NaCl solution. Further, the interfacial charge transfer resistance was examined using the impedance technique in [Fe(CN)6]−3/−4 redox probe. The result shows that the electrodeposition quality and performance are enhanced with US-SC-CO2 condition. The introduction of ultrasonic agitation to the SC-CO2 condition, the electrolyte flow rate is enhanced, and fine morphological features are obtained due to the cavitation phenomenon. Thus, the US-SC-CO2 electrodeposition process to Cu/PVP composite coatings enriches overall performance compared to that of SC-CO2 and conventional methods.
•High-performance Cu/PVP coating was prepared by ultrasonic-assisted SC-CO2 process•The Cu/PVP coating significantly improves the microhardness•PVP act as inhibitor in the composite coating•The inhibition of coating, increased with PVP and accelerated in presence of Cl− ions