Optimization of Corrosion Resistance in AA7075 using Hybrid Si-Zr Sol-Gel Coatings Doped with Cerium Nitrate using Taguchi Method
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Abstract
In this investigation, the Taguchi method was applied to experimental design to ascertain the most favourable parameters for a hybrid sol-gel coating composed of Si-Zr and cerium nitrate. Each of the five independent variables in the experimental design had four possible values. It employed an L16 orthogonal array. The purpose of these trials was to find the ideal sol-gel deposition settings for AA7075. The chemical arrangement of hybrid films was studied with attenuated total reflectance Fourier transform infrared spectroscopy. Using a potential-dynamic polarization testing, the corrosion rate of the coatings was assessed. Analysis of variance was employed to predict the optimal processing parameters based on data analysis and the signal-to-noise ratio. Applying the optimal experimental conditions resulted in a five-fold reduction in the corrosion rate of coated AA7075 relative to uncoated AA7075.
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