Role of Surface Preparation in Corrosion Resistance Due to Silane Coatings on a Magnesium Alloy

Abhishek Saxena; R K Singh Raman

doi:10.3390/molecules26216663

Role of Surface Preparation in Corrosion Resistance Due to Silane Coatings on a Magnesium Alloy

Molecules. 2021 Nov 3;26(21):6663. doi: 10.3390/molecules26216663.

Authors

Abhishek Saxena¹, R K Singh Raman^{1

2}

Affiliations

¹ Department of Chemical and Biological Engineering, Monash University, Clayton, VIC 3800, Australia.
² Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia.

Abstract

Coating of an organo-silane (Bis-1,2-(TriethoxySilyl)Ethane (BTSE)) has been observed to improve the corrosion resistance of magnesium alloy AZ91D. Three different types of surface preparations have been employed before condensing the silane coating on to the substrate. Corrosion resistance was investigated using electrochemical impedance spectroscopy (EIS). A specific alkali treatment of the substrate prior to the coating has been found to improve the corrosion resistance of the coated alloy, which has been attributed to the ability of the treatment in facilitating the condensation of a relatively compact siloxane film.

Keywords: electrochemical impedance spectroscopy; magnesium alloys; silane coatings.