Yttrium Chloride as Corrosion Inhibitor for 6061Al- SiC Composites in 1:1 mixture of HNO3 + HCl

Abstract

Abstract:The corrosion studies were conducted on Al 6061-
15% SiC composites in a 1:1 mixture of HNO3 and HCl
solution of different concentrations viz. 1M, 0.5M and 0.1M at
30, 40 and 50ºC using Tafel Extrapolation Technique.
Corrosion Inhibition studies were carried out using Yttrium
Chloride in different concentrations viz. 50, 100 and 200 ppm.
From the data gathered, various thermodynamic and kinetic
parameters were calculated. Al – SiC composite was found to
be severe to corrosion in 1M HCl+HNO3.The corrosion rate of
composite increases with increase in temperature. Yttrium
Chloride is found to be effective in decreasingthe corrosion
rates about 91% inhibition was observed at 200 ppm
concentration of the inhibitor in HCl+HNO3.The efficiency of
inhibition increases with concentration of inhibitor.
Index Terms: Al 6061-SiC composites, 1:1 mixture of HNO3
and HCl, Corrosion inhibition, Yttrium Chloride inhibitor,
physisorption, Frumkin adsorption isotherm.