Abstract
An effort is made to study the effect of composite nanocoating using aluminum-9%wt silicon alloys reinforced with different percentage (0.5,1,2,4)wt.% of carbon nanotubes (CNTs) using plasma spraying. The effect of this composite on corrosion behavior for AA6061-T6 by extrapolation Tafel test in sea water 3.5wt% NaCl was invested. Many specimens where prepared from AA6061-T6 by the dimension (15x15x3)mm as this first set up and other steps include coating process, X-ray diffraction and SEM examination .The results show the CNTs increase the corrosion rate of the nanocomposite coatings with increasing the weight percentage of CNTs within the Al-Si matrix. Al-9wt%Si coating layer itself has less corrosion rate if compared with both nanocomposite coating and the substrate of AA6061-T6.
Highlights
The new researches elaborate on aluminiumbased composite found its exhibit many achievable fascinating material properties such as stiffness, wear resistance, specific strength, damping properties with less coefficient of thermal expansion when its compared with the conventional aluminium alloys [1]
Many corrosion specimens from base material were prepared in the dimensions of (15x15x3)mm according to ASTM (G71-31) aluminum 9%wt silicon powder of particle size 15-70 μm were purchased from Phoenix Scientific Industry Ltd., UK (PSI) High purity of a Multiwall carbon nanotubes (80 wt%) (20-70)nm diameter (1-3)μm in length were purchased from ARRY International Group Limited, Germany
The MWNTs are not clearly shown in the X-ray diffraction (XRD) graphs but its detected by program with slightly small peaks intensities in case of 2wt% and 4wt% of carbon nanotubes (CNTs), this is due to the small amount of CNTs which is below the detection limit of the X-ray counter and the dispersion of CNTs in Al9wt%Si particles so the majority of MWNTs are embedded in the matrix, this confirmed in micrograph shown in Figure (3)
Summary
The new researches elaborate on aluminiumbased composite found its exhibit many achievable fascinating material properties such as stiffness, wear resistance, specific strength, damping properties with less coefficient of thermal expansion when its compared with the conventional aluminium alloys [1]. Researches where used carbon to obtain reinforcement of Al-Si alloys to achieve combination of high strength and high modulus of elasticity of fiber and high toughness of the matrix [4]. Aluminum silicon alloy (Al-9wt%Si) effects on pitting corrosion when it's immersed in 0.5M NaCl solution with current density (icorr.) equal 0.96 μA/cm2 [10,11]. Alloy AA6061T6 is known as a structural alloy This alloy has best resistance to corrosion when the amount of silicon does not exceed the amount of high level which combines with the magnesium content to form MgSi [12]. In this research, was aimed to study corrosion behavior of Al-9wt%Si/MWNTs nanocomposite coating materials in sea water with different portion of MWNTs as compared with Al-9wt%Si alloy its self were investigated
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