Abstract
In this work, the fabrication of three Al-2wt.% SiC nanocomposites processed by novel milling route was carried out. The beneficial influence of milling route on the corrosion passivation of the new fabricated composites was investigated. The cyclic polarization measurements have proved that increasing the time of ball milling highly reduced the corrosion of Al-SiC nanocomposite via reducing obtained corrosion current and so increasing the corrosion resistance. These results were affirmed by the electrochemical impedance spectroscopy experiments. The pitting corrosion of the manufactured composites was also reported, and its intensity decreased with the increase of ball milling time. The electrochemical experiments were also performed after expanding the exposure time in the chloride solution to 24 and 48. It was found that both the uniform and pitting corrosion decrease with prolonging the time. The study was complemented by examining the surface morphology and the elemental analyses for the different composites by using surface analyses techniques.
Highlights
Aluminum and its composites are employed in numerous structural purposes in our daily life
The lightweight, good fatigue strengths improved mechanical properties and high wear resistance are the main reason for the use of these materials in such applications. Due to these various applications, the corrosion behavior in aggressive media is very important for Al-based composites [5,6,7,8,9]
The values of RP were the highest for Nanocomposite 3 after its immersion for 48 h, which confirms that the increase of ball milling time as well as the immersion time enhances the corrosion resistance of Al-Sci nanocomposite
Summary
Aluminum and its composites are employed in numerous structural purposes in our daily life. The microstructural and corrosion behavior of Al/SiC composite in 3.5% NaCl solution at different temperatures was reported by H. The objective of this research work was to manufacture Al-2%SiC composites that was processed at three different ball milling routes. Three aluminum metal matrixes reinforced with 2 wt.% SiC nanoparticles were synthesized via different powder metallurgy routes. The fabrication of these three nanocomposites has been reported in the previous study [20]. The synthesized nanocomposites powders were consolidated using high-frequency induction heat sintering furnace (HFIHS) from ELTek Co., Gyeonggi-do, South Korea In this consolidation process, compaction and sintering are conducted simultaneously in 5 min. The required heat for the sintering process is generated at 150 ◦C/min by applying a strong magnetic field
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