Corrosion behaviour of Al/SiC and Al/Al2O3 nanocomposites

Abstract

In the present investigation, the static immersion corrosion behavior of Al/Al 2 O 3 and Al/SiC nanocomposites in 1 M HCl acidic solution was evaluated. The nanocomposites were fabricated using conventional powder metallurgy (P/M) route. The effect of nanoparticulates size and volume fraction on the corrosion behavior of nanocomposites was studied. The durations of the corrosion tests ranged from 24 to 120 hours and the temperatures of the solution ranged from ambient to 75 °C. The corrosion rates of the nanocomposites were calculated using the weight loss method. The results showed that both Al/SiC and Al/Al 2 O 3 MMNCs have lower corrosion rates than the pure Al matrix. Such behavior was noticed at both ambient and higher temperatures. Generally, the Al/Al 2 O 3 nanocomposites exhibited lower corrosion rates than the Al/SiC nanocomposites. The Al/Al 2 O 3 (60 nm) nanocomposites exhibited the highest corrosion resistance among all the investigated nanocomposites. The corrosion rate was found to be reduced by increasing of the exposure time and the volume fraction of the nanoparticulates, while it was found to be increased by increasing of the nanoparticulates size and the solution temperature.

Corrosion, optimization and surface analysis of Fe-Al2O3-CeO2 metal matrix nanocomposites

“…It is also observed from the results that corrosion potential (E corr ) for the synthesized specimens varied from À559 to À129 mV. Specimen 10AFe0.5Ce1100 (1) shows highest shift of E corr (430 mV) towards noble direction followed by 10AFe1.0Ce1100 (1). Corrosion current of the specimen 10AFe0.5Ce1100(1) and 10AFe1.0Ce1100(1) was found to be 0.329 μA and 74300 μA, respectively.…”

“…Pure Fe and Pure Fe+0.5% CeO 2 specimen showed corrosion potential value of À559 mV and À549 mV whereas corrosion current value of Pure Fe and Pure Fe+0.5% CeO 2 , was found to be 200000 μA and 127000 μA. Specimen 10AFe1.0Ce1100 (1) showed corrosion rate of 18390 mpy whereas specimen 10AFe0.5Ce1100 (1) showed corrosion rate of 0.0813 mpy. Corrosion potential of 10AFe0.5Ce1100(1) and 10AFe1.0Ce1100(1) was found to be À129 mV and À535 mV.…”

“…This is for the reason that they concede various features, especially enhanced mechanical characteristics as compared to any other conventional micro-particle reinforced MMCs. 1 When nanoparticles are added to composite in the form of reinforcements, the strength to weight ratio is increased and mechanical properties are also affected in a good way. As per the comprehensive study, the different methods have been recognized by the researchers for the fabrication purpose of MMNC material.…”

A comprehensive study of Al-Cu-Mg system reinforced with nano-ZrO2 particles synthesized by powder metallurgy technique

“…Notably, these corrosion inhibitors include alloying elements, anodizing the surface, and/or painting their surfaces with a protective coating layer [7,8]. In spite of these amazing properties, other monolithic alloys are more desirable than AMCs where the latter nanocomposites possess several drawbacks such as manufacturing defects, internal stress, differences in microstructure and coupling of the matrix and reinforcement which consequently, leads to galvanic effects [9]. There are several studies investigating the properties of Al and Al alloy matrix composites.…”

Fabrication and High Temperature Friction Behavior and Oxidation Resistance of Ni-Co-ZrO2 Composite Coating

“…Therefore, in order to improve the wear, corrosion and high temperature oxidation resistance of carbon steels, surface strengthening techniques are still needed to increase the service life and reliability and to improve the performance and quality of mechanical equipment. Fine particles reinforced metal matrix composite coatings are made up of matrix metal and evenly dispersed second-phase particles such as ZrO 2 3 , B 4 , CeO 2 8 , SiC 5,9,10 , possessing excellent comprehensive performance. ZrO 2 is commonly used as the second ceramic phase due to its high hardness, low thermal conductivity and high temperature oxidation resistance.…”