Surface Quality of Fe, Ni and Cr added Hyper-eutectic Al-Si Automotive Alloys under Up-milling and Down-milling Operation

Khan, Akib Abdullah; Shoummo, Mashiur Rahman; Kaiser, M. S.

doi:10.17977/um016v6i12022p009

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…A small amount of other alloying elements like magnesium, silicon, manganese, etc. are usually added to this type of alloy to improve strength [1]. Aluminum alloys are demanded nowadays for their remarkable performance because they have a high strength-to-weight ratio, better weldability, appropriate hardenability, and enhanced corrosion resistance [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Electrochemical Corrosion Property of 2xxx Series Cast Aluminium Alloy in 0.3 M, 0.6 M NaCl, and Seawater Environments

Khan,

Kaiser,

Nur

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The electrochemical corrosion activities of 2xxx series Al alloys were investigated in NaCl of 0.3 M, and 0.6 M concentrations and seawater environments. Both Tafel polarization and electrochemical impedance spectroscopy (EIS) methods were followed to analyze the corrosion behavior. These results implied that corrosive attack is more aggressive in sodium chloride solution compared to seawater, as additional elements present in seawater are involved in forming various protective layers. Again, a higher concentration of NaCl solution damaged the alloy surface more drastically. The open circuit potential moved towards the nobler direction in the case of seawater environment, and 0.3 M solution for NaCl. The corrosion rate and corrosion current showed higher values in NaCl solution than in seawater. The surface morphologies of the alloys were characterized not only with an optical microscope but with a scanning electron microscope also. The scratch marks from polishing were removed after corrosion. Extensive damage to the surface was found in the NaCl environment, where 0.6 M solution created the most damage, which is evident by both optical and scanning electron micrography. A higher level of pitting corrosion occurred in NaCl than in seawater, identified by SEM images.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Electrochemical Corrosion Property of 2xxx Series Cast Aluminium Alloy in 0.3 M, 0.6 M NaCl, and Seawater Environments

Khan,

Kaiser,

Nur

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Various elements such as Si, Cu, Ni, Fe, Mn, etc. are added as alloying elements in the alloy matrix to upgrade various mechanical and physical properties of aluminum alloys [20]. Silicon as an alloying element improves not only strength but surface quality, corrosion resistance, hardness and other properties in the alloy [21,22].…”

Section: Introductionmentioning

confidence: 99%

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Salim Kaiser,

Abdu

2023

JCTM

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This study aimed to evaluate the electrochemical corrosion behavior at the eutectic level of Al-Si automotive alloy in 0.2 M HCl, 0.2M NaCl, and 0.2M NaOH solutions at room temperature. By EIS method in accordance with the specific equivalent circuits of the system, and also by recording Tafel dependences, data were obtained on the kinetic and corrosion parameters in the studied environments for two types of alloys -Al-Si alloy with a eutectic composition of Si (12.7 wt. %) аnd Al-Si alloy containing traces of silicon (0.2 wt. %). Both the EIS data and the Tafel plots disclosed to addition of Si improved the corrosion resistance in the Al-Si alloy in NaCl and HCl environments. In contrast, the opposite phenomenon was observed in the NaOH environment. Added Si improved corrosion resistance by forming MgO and SiO 2 layers; nevertheless, OHmore aggressively attacks the surface than Clions, hindering the corrosion-resisting mechanism by Si. The alloys showed the best corrosion resistance in NaCl solution. In contrast, NaOH was the most destructive, followed by HCl solution, as a more compact and uniform film was formed in NaCl solution. The open circuit potential enthused to the nobler direction in eutectic alloys in NaCl and HCl solution, while NaCl showed comparatively higher open circuit potentials (OCP) than HCl and NaOH. The corrosion current from Tafel analysis and the polarization resistance from EIS analysis showed the maximum values in NaCl solution and the minimum in NaOH solution, as the corrosive attack by OHwas more damaging. The optical and SEM images revealed that scratch marks on polished surfaces were disappeared, and protective layers are formed after corrosion, which are thicker and more compact in the NaCl environment and in higher Si added alloy under NaCl and HCl solution, NaOH being an exception. These images depicted maximum damage in NaOH solution, and then in HCl solution, NaCl showed the minimum damage.

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“…For enhancement of the strength, other alloying elements such as Fe, Ni, Cu, Mg etc. are added to Al-Si alloys [11]. However, in most cases, Cu and Mg have been considered alloying elements for the reason that the strength of the alloys accelerates through heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Wear studies on Al-Si automotive alloy under dry, fresh and used engine oil sliding environments

Khan¹,

Kaiser²

2022

Res. Eng. Struct. Mater.

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A comparative study has been made on the wear behavior of eutectic Al-Si automotive alloy under a dry, fresh and used engine oil sliding environment. The wear tests have been conducted using a standard pin-on-disc apparatus. The results show that with silicon content, the wear loss decreases up to the eutectic composition, mainly for an increase in strength through Si-rich intermetallics. Therefore the lower wear rate along with the coefficient of friction is observed under dry sliding environment. Under the engine oil environment, the lubricating film controls the wear, so the results are the lowest wear rate and coefficient of friction. Used oil shows both wear rate and friction coefficient to some extent higher due to the presence of heavy and harmful chemical compounds. Wear test surfaces are examined by optical and SEM analysis and found that higher abrasive wear and plastic deformation on the worn surfaces are created in dry sliding condition as well as lower Si added alloy. On the worn surface under engine oil lubricating condition, smooth surface morphology is observed as form a lubrication film and thumbs down any direct contact on the moveable surfaces. Higher Si-added alloys contain superior fine intermetallics due to ageing, which is responsible for such smooth worn surfaces.

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Surface Quality of Fe, Ni and Cr added Hyper-eutectic Al-Si Automotive Alloys under Up-milling and Down-milling Operation

Cited by 6 publications

References 25 publications

Investigation of the Electrochemical Corrosion Property of 2xxx Series Cast Aluminium Alloy in 0.3 M, 0.6 M NaCl, and Seawater Environments

Investigation of the Electrochemical Corrosion Property of 2xxx Series Cast Aluminium Alloy in 0.3 M, 0.6 M NaCl, and Seawater Environments

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Wear studies on Al-Si automotive alloy under dry, fresh and used engine oil sliding environments

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