Corrosion Resistance of Al–CNT Metal Matrix Composites

Abstract

The design of aluminium–graphite metal matrix composites (MMCs) with advanced mechanical properties and high corrosion resistance is in demand for aerospace, transportation, and industrial applications. Breakthroughs in this field are limited due to the tendency of aluminium–graphite MMCs to corrode. In the present research, aluminium-based MMCs were produced by a relatively novel combined two-staged method. Multiwall carbon nanotubes (MWCNTs) were added into molten Al1070 and processed by high-pressure die casting followed by cyclic extrusion. For the composites produced by this method, it was previously demonstrated that mechanical properties are improved in comparison with pure aluminium alloys. In the current study, the manufactured Al–MWCNT composites were investigated by electrochemical tests (such as open circuit potential), potentiodynamic tests, linear polarization tests, and electrochemical impedance spectra to understand the corrosion resistance of the obtained composite material. The experimental testing of the corrosion resistance of Al–MWCNT MMCs showed that due to the advantages of the fabrication method, the addition of CNTs to aluminium does not cause a radical decrease of corrosion resistance.

Evaluation of MWCNT Particles-Reinforced Magnesium Composite for Mechanical and Catalytic Applications

“…The specifications of the Vickers hardness tester are voltage 220 V, power 1500 W, and frequency 60 Hz. All the samples are tested three to four times, and the hardness value is averaged [ 43 ]. A salt spray corrosion test is conducted with the help of the Weiss model salt spray chamber; the frequency range is 50/60 Hz.…”

Influence of Preheating Temperature on Structural and Mechanical Properties of a Laser-Welded MMC Cobalt Based Coating Reinforced by TiC and PCD Particles

“…Recently, there has been a great deal of interest in the use of the laser cladding method to produce composite surface layers on the surface of components made of ferrous and nonferrous alloys [3,4]. Metal matrix composites (MMCs), due to their properties such as high hardness, excellent wear and corrosion resistance, are currently the most interestingin terms of research and being the most desirable materials in industrial applicationsgroup of additional materials for laser surfacing [5,6]. The combinations of metal matrix and reinforcing particles are very diverse, and the most popular are composites based on iron, nickel, cobalt, magnesium and aluminum alloys in combination with reinforcing particles such as tungsten carbide (WC) [7,8], silicon carbide (SiC) [9], boron carbide (B 4 C) [10] and titanium carbide (TiC) [11], the latter being used in this study.…”

Impact of Cladding Technology on Residual Stresses within the Renovation of High Pressure Die Casting Molds

“…High melt flow rates of aluminum alloys (up to 120 m/s −1 ), high pressures (up to 120 MPa), and high maximum surface temperatures of mold parts (up to 550 • C) lead to erosion, abrasion, corrosion, and thermal fatigue of the mold. This issue is addressed in publications [1][2][3][4][5].…”