DRY AND HOT CORROSION BEHAVIOUR OF Al-Ni-Co-x MWCNT COMPOSITES PROCESSED THROUGH POWDER METALLURGY

Abstract

The outcome of this research paper is to investigate the room and hot corrosion behavior of Al-10Ni-4Co-x multi-walled carbon nanotube (MWCNT) composites processed through Powder Metallurgy (P/M). The secondary particle MWCNT content was varied as 0.5, 1.0 and 1.5[Formula: see text]wt.%, respectively. The fabricated composites were characterized using a Scanning Electron Microscope (SEM). The corrosion behavior of the composites was analyzed using Tafel polarization. After polarization, the corroded surfaces were analyzed using SEM. The high temperature corrosion behavior was also investigated and found that the corrosion rate of 3.9025 mpy for 90Al-10Ni-4Co composite and 4.9025 mpy for 85Al-10Ni-4Co-1.0MWCNT composite. The results indicated that 84.5Al-10Ni-4Co-1.5MWCNT composite possessed better corrosion resistance than other composites. Various elements including Na, Cl, Al, Ni, Co, Mg, Si and O were observed. It reveals that Na[Formula: see text] and Cl− ions react well with Ti. Hot corrosion studies clearly demonstrated that after the 50 h test, the samples with MWCNT inclusion exhibited improved corrosion resistance. The 85Al-10Ni-4Co-1.0MWCNT composite showed a mass change of 0.01870[Formula: see text]mg which was 5% lower than 90Al-10Ni-4Co composite.