Development of Superhydrophobic Coatings on AA 7075 by Surface Modification Using Fatty Acids

Amruthaluru Saikiran; Siva Kumar Mamidi; Arun Mohan Nair; Sampatirao Hariprasad; Rameshbabu Nagumothu

doi:10.4028/www.scientific.net/KEM.833.69

Paper Titles

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Effect of Pressure on the Gas Atomizer to Fabricate Stainless Steel Metal Powder
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The Effect of Stand - Off Distance on the Mechanical Properties of TIG Butt Joints of 316 Stainless Steel
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Development of Superhydrophobic Coatings on AA 7075 by Surface Modification Using Fatty Acids
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Effects of Cu Addition on Age Hardening Response of Al-7Si-4Mg Alloys at 130 °C
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Microstructure, Hardness, and Surface Cracks Evaluation of HVOF-Sprayed Stellite-1 Coating Applied on Steam Turbine Blade
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Corrosion of Fe-Cr and Fe-Cr-Ni Alloys at 700-800°C in CO₂-0.3SO₂-6O₂ Mixed Gas
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Prediction of the Effective Stress-Strain Curves of Ductile Polymer 1D-Reinforced Composites Filled with Hollow Fibers Using Parameterized Model Based on Bezier Curves
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 833Development of Superhydrophobic Coatings on AA...

Development of Superhydrophobic Coatings on AA 7075 by Surface Modification Using Fatty Acids

Abstract:

The present work is aimed at developing superhydrophobic coatings on AA 7075 using two different fatty acids namely Stearic acid and Myristic acid. The coating was developed by initially etching the substrate in 1 M NaOH solution at a temperature of 70 °C for 10 hours, followed by passivating in 0.01 M ethanolic stearic acid and 0.01 M ethanolic myristic acid for different durations of passivation time. The coated samples were further investigated for their surface morphology, wettability and corrosion resistance. The contact angle and surface morphology of the developed coatings were assessed by contact angle goniometer and scanning electron microscopy (SEM) respectively. The corrosion behavior of the coatings was studied in 3.5 Wt. % aqueous NaCl solution by potentiodynamic polarization test (PDP). Passivation using fatty acids resulted in alteration of the surface morphology, which resulted in the increase of the contact angle exhibiting superhydrophobic nature, which also enhanced the corrosion resistance of the alloy.