Effect of Fe, Ni, and Cr on the corrosion behaviour of hyper-eutectic Al-Si automotive alloy under different pH conditions

Kaiser, M. S.; Nur, Maglub Al

doi:10.5599/jese.493

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The results observed in H2SO4 media are ascribed to the high aggressive attack of sulphide ions, leading to the disruption of passive films formed on the metal surfaces. However, the corrosion rate is slightly lower than that observed at the earlier stage of immersion, suggesting that the passive films formed on the surface of the experimental samples are stable [17,18]. In the case of alkaline solution, the higher corrosion rate at the initial stage could be due to the segregation of copper oxide formed in the matrix.…”

Section: Gravimetric Analysis Of Corrosion Effectmentioning

confidence: 72%

A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments

Kaiser

2020

J. Electrochem. Sci. Eng.

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Chemical and physical behavior including corrosion performance, thermal conductivity and visual color change of the copper-based alloys brass and bronze have been studied prior and after corrosion in acidic, alkaline and saline media. The concentrations of 0.5 M H2SO4, 0.5 M NaOH and 0.5 M NaCl were used in which copper and copper-alloy samples were immersed and left to corrode at room temperature for 28 days. The experiments were performed prior and after corrosion, using conventional gravimetric measurements accompanied with measurements of thermal conductivity, microstructure and optical properties. The color change of different samples was also studied through tristimulus color parameter (L*, a* and b*) values. It is concluded that the corrosion rate of copper and copper alloys is greater in acidic than in salt and alkaline media. This is due to the extent of disruption of the passive film formed on the surfaces. In the cases of alkaline and salt media, the passive films on the surface remain stable to a large extent. Small increase of thermal conductivity takes place due to formation of a very thin film of oxide and hydroxide bonded to the surface. The environment also affects the color of copper and copper alloys by chemical changes like oxidation and formation of different intermetallics on the surfaces. A microstructural study of experimental materials confirms that corrosion after 28 days results in formation of pores on the surfaces in acidic environment, and passive film that grows thicker on the surfaces in alkaline and saline environments. Aluminum oxide that is more stable than zinc oxide causes better anti-corrosion performance and minimal color variation of bronze compared to brass, especially in acidic environment.

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Section: Gravimetric Analysis Of Corrosion Effectmentioning

confidence: 72%

A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments

Kaiser

2020

J. Electrochem. Sci. Eng.

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“…Thermal conductivity of pure aluminium is around 210 W/m k. Addition of a variety of alloying elements like Si, Cu, Mg stay in solid solution distorts the lattice of the Al matrix and reduces the thermal transportation of electrons. On the other hand, Si-rich intermetallic increase with the Si contents and boost the scattering of electrons and phonons [13,26].…”

Section: Age-hardening Behavior Isochronal Ageingmentioning

confidence: 99%

THERMOPHYSICAL PROPERTIES OF HYPOEUTECTIC, EUTECTIC AND HYPEREUTECTIC Al-Si AUTOMOTIVE ALLOYS UNDER AGEING TREATMENT

Razin,

Ahammed,

Khan

et al. 2024

JCTM

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Influence of different levels of silicon under a variety of thermal treatment is investigated on the thermophysical behaviour of Al-Si-Cu-Mg automotive alloys. Conventional cast alloys are subjected to T6 heat treatment for age hardening. Hardness values, thermal conductivity along with microstructural observation under different heat-treated conditions are well thought-out to comprehend the ageing performance and the precipitation behaviour of the alloys. From these investigational results it is indicated that two successive hardening peaks take place in the agedalloys. Ageing sequence consists of different phases like a supersaturated solid solution, GP zones, intermediate βʹʹ, intermetallic βʹ, equilibrium β and the Q phase but GP zones and the metastable phases are most likely responsible for these ageing peaks. Thermal conductivity decreases for these precipitates formation during ageing and increases for relieving the internal stress, dissolution of metastable phase and coarsening the precipitation of the alloys. Addingup of Si to the alloy showed earlier ageing peaks with higher intensities intended for its increasing properties of heterogeneous nucleation and diffusion kinetics. After ageing around at 200°C for four hours the alloys offer the height hardness. Microstructural study reveals that eutectic silicon makes the grain boundary coarsen and beyond the eutectic composition the star-shaped blocky primary Si is formed. Subsequent to ageing at 350oC for one hour the alloys reach completely recrystallized state.

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Effect of Fe, Ni, and Cr on the corrosion behaviour of hyper-eutectic Al-Si automotive alloy under different pH conditions

Abstract: Effect of Fe, Ni and Cr on the corrosion behaviour of hyper-eutectic Al-Si automotive alloy was studied. The test of corrosion behaviour at different environmental pH 1, 3, 5, 7, 9, 11 and 13

Cited by 2 publications

References 11 publications

A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments

A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments

THERMOPHYSICAL PROPERTIES OF HYPOEUTECTIC, EUTECTIC AND HYPEREUTECTIC Al-Si AUTOMOTIVE ALLOYS UNDER AGEING TREATMENT

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