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ABSTRACT

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In this work, Ni and Ni-graphene, Ni-G, films were electrodeposited on copper substrate by potentiostatic deposition. To achieve superhydrophobicity, myristic acid, MA, was used to modify the surface of the electrodeposited coatings. The manufactured Ni film modified with myristic acid, Ni-MA, and the Ni-G film modified with myristic acid, Ni-G-MA, show excellent superhydrophobic, SHP, properties with a water contact angle of 159° and 162°, respectively. The surface morphology of the prepared SHP films was investigated using a Scanning Electron Microscope, and the results revealed micro-nano structures in both Ni-MA and Ni-G-MA films. The Fourier Transform Infrared Spectrophotometer data showed that the Ni-MA and Ni-G-MA films were successfully grafted on the copper metal. The Ni-G-MA film possessed higher chemical stability and mechanical abrasion resistance than Ni-MA. The Ni-MA and Ni-G-MA films exhibit long-term durability in the outdoor environment for more than four months. The potentiodynamic polarization and electrochemical impedance spectroscopy results demonstrated that the SHP films on the copper substrate exhibit remarkable corrosion resistance in 0.5 M NaCl.

The corrosion of aluminium in 1M HClO 4 at 40°C has been investigated using the potentiodynamic polarisation technique. The effect of various inorganic additives has been investigated. It was found that NO 3 , NO 2 and SCN anions exhibit an inhibiting action on acid corrosion of aluminium by reducing the general corrosion rate as well as raising the pitting potential E p . It was found that CrO 2 4 ions were unique in demonstrating a remarkably high inhibiting action but their in uence on the pitting potential was less pronounced than that of the group above. On the other hand, added halides induced an accelerating effect on the corrosion rate and lowered the pitting potential. However, SO 2 4 ions do not show any signi cant effect on the corrosion behaviour of Al in 1M HClO 4 . The results have been interpreted on the basis of the adsorption mechanism followed by incorporation into the native lm.