Analysis of SiC grain size variation and NaCl concentration on the corrosion susceptibility of AA1070 aluminium matrix composites
No Thumbnail Available
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Cogent Engineering
Abstract
Description
Analysis of the impact SiC grain size at 10% wt. on the corrosion
resistance of AA1070 aluminium matrix composites was studied in Cl− anion
containing dilute H2SO4 solution. Studies were performed with potentiodynamic
polarization and open circuit potential (OCP) measurement. Optical microscopic
studies were performed on the corroded matrix composites. Results show that the
corrosion susceptibility of the composites increased proportionately with increase
in Cl− ion concentration. The matrix composites at 3 um and 9 um SiC grain size
exhibited the lowest corrosion rate values in comparison to the base alloy and
composites with larger SiC grain sizes. OCP values for the matrix composite at
0 μm SiC in the acid solution (0.25 M H2SO4/0% and 0.25% NaCl) was the most
electronegative due to lower thermodynamic stability than matrix composites
with larger SiC grain sizes. Optical microscopic studies show that corrosion was
mainly localized for all specimens tested due to pitting at low Cl− ion concentration
in comparison to general corrosion for the metal substrate and total
destruction of the matrix composite morphology at higher chloride concentration.
Results of statistical analysis through ANOVA showed that SiC grain sizes are more.
Keywords
TD Environmental technology. Sanitary engineering, TJ Mechanical engineering and machinery