Abstract
This paper presents the results obtained and the discussion made from a series of corrosion experiments involving aluminum alloy (LM 13) reinforced with Nano-ZrO2, size of the particles dispersed varies from 100 to 200 nm and amount of addition varies from 3 to 15 wt.% in steps of 3 wt.%. The resulting CNMMCs are solidified under the influence of copper chill of 25 mm thickness to study the effect of corrosion behavior. The corrosion test employed was the electrochemical polarization method according to ASTM G59-97 (2009) standards. Corrosion resistance was found to increase significantly with increase in ZrO2 content in chilled CNMMCs. Nevertheless, even with high ZrO2 content corrosion attack, that is, pitting was found to be most severe during the initial stage of each test but it invariably decreased to a very low value in the later stages, due to the formation of an adherent protective layer on the CNMMCs developed. Scanning electron microscopy (SEM) studies of the corroded surface were also examined to study the mechanism of corrosion. Key words: Nano, corrosion, chill, composite, solidification, microstructure.
Highlights
As aerospace technology continues to advance, there is a rapidly increasing demand for advanced materials with enhanced mechanical properties and environmental capabilities for such ultrahigh applications (Opeka, 2004).Its application stretched to automobile, electronic, computer and shipping industries to replace the existing materials (Luo, 1995)
Results of the investigation on solidification, microstructure and corrosion behavior reveal that adding reinforcement content up to 12 wt.% has uniform distribution and addition above this limit causes cluster formation
The result of microstructural studies of CNMMCs did not reveal presence of Deltaa(microamps/sqcm) any micro-pores or shrinkage cavity or there was no evidence of any microstructural defects
Summary
As aerospace technology continues to advance, there is a rapidly increasing demand for advanced materials with enhanced mechanical properties and environmental capabilities for such ultrahigh applications (Opeka, 2004). Its application stretched to automobile, electronic, computer and shipping industries to replace the existing materials (Luo, 1995). The early 1990s is considered to be the renaissance for Al as structural material due to environmental concerns, increasing safety and comfort levels. A significant improvement in the properties of Al alloys, reduced fuel consumption because of its light weight and it has created a huge demand from the aerospace industry (Saravananand and Surappa, 2000; Hassan and Gupta, 2002). A recent industrial review revealed that there are hundreds of components from structural to engine in which aluminum alloy is being.
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