Effect of Post Heat Treatment on Corrosion Resistance of Phytic Acid Conversion Coated Magnesium
By Gupta, R.K.; Mensah-Darkwa, K. & Kumar, D.
Published in Journal of Materials Science & Technology
NULL
2013
Abstract
An environment friendly chemical conversion coating for magnesium was obtained by using a phytic acid solution. The effect of post-coating 1heat treatment on the microstructures and corrosion properties of phytic acid conversion coated magnesium was investigated. It was observed that the microstructure and corrosion resistive properties were improved for the heat treated samples. The corrosion current density for bare magnesium, phytic acid conversion coated magnesium, and post-coating heat treated magnesium was calculated to be 2.48Â X Â 10-5, 1.18Â X Â 10-6, and 9.27Â X Â 10-7Â A/cm2, respectively. The lowest corrosion current density for the heat treated sample indicated its highest corrosion resistive effect for the magnesium. The maximum corrosion protective nature of the heat treated sample was further confirmed by the largest value of impedance in electrochemical impedance spectroscopy studies.
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