journal article·2025-02

Electrochemical Behavior and Surface Chemistry Studies of Electrodeposited MnMoCrCoFeNiCu High Entropy Alloy-Carbon Nanotube Composite Coatings

Premlata Rao, Sujata Singh, Krishna Kumar, Upender Pandel, Chandan Srivastava

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Abstract

MnMoCrCoFeNiCu high-entropy alloy (HEA)-carbon nanotube (CNT) composite coatings were produced by the electrodeposition route using aqueous electrolyte bath containing different concentrations of dispersed CNTs (0.25, 0.5, 1, 2, 5, 10, 15, 20 mg/l). Morphology, elemental composition, phase constitution, wettability and electrochemical behavior of the composite coatings are correlated. Lower volume fractions of CNTs yielded compact coating morphology and compositional homogeneity. Corrosion rate of the coatings varied non-monotonically with CNT volume fraction and at an optimum volume fraction (for HEAC4 coating: produced from electrolyte with 10 mg/l of CNTs) highest corrosion resistance was observed. Owing to the hydrophobic nature of CNTs, the water contact angle increased from 79.11° for HEA coating to 146.62° for the HEAC4 coating. After the exposure in 3.5 wt. NaCl (corrosive media), the passive oxide layer formed on the CNT-reinforced HEA coatings contains stable oxides of Cr, Mo, Fe and Ni, as compared to the oxides formed over the HEA coating, which reduces the susceptibility of the composite coatings to the 3.5 wt. NaCl corrosive solution. All these factors led to a sharp decline in the corrosion rate from 5.76mpy for the HEA coating to 1.46mpy for HEAC4 coating. Beyond the optimum CNT volume fraction, agglomeration of CNTs led to surface defects and cracks with enhanced corrosion rate. © ASM International 2024.
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Research context

OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Chalcogenide Semiconductor Thin Films

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