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HomeSolid State PhenomenaSolid State Phenomena Vol. 317Effect of Mechanical Agitation on Cr-Al2O3...

Effect of Mechanical Agitation on Cr-Al₂O₃ Nanocomposite Coatings Fabricated from Trivalent Chromium Electrodeposition

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Abstract:

In the present work, Cr-Al₂O₃ nanocomposite coatings were electrodeposited onto a copper substrate using a modified trivalent chromium electroplating bath with the addition of 80nm Al₂O₃ powder. The effects of mechanical agitation of electrodeposition bath on Al₂O₃ particles dispersion and particles embedment were studied. The Cr-Al₂O₃ nanocomposite samples were subjected to different tests to characterize their surface morphology, crystalline structure, and mechanical properties. The crystalline structure, composition and surface morphology of the deposits were studied by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and field emission scanning electron microscopy (FESEM). The corrosion resistance test was carried out by electrochemical polarization method. The microhardness was studied via Vickers Microhardness Test. The variation in the microhardness as a main property to achieve enhancement of Al₂O₃ incorporations with Cr matrix. From the EDX analysis, Cr-Al₂O₃ nanocomposite deposited at 200 rpm stirring speed showed the highest weight percentage (wt%) of alumina. The hardness results showed the Cr-Al₂O₃ composite coating has the best performance at 200 rpm stirring speed which the hardness increased 32.3 % compared to that of Cr coating. The corrosion current density (i_corr) of Cr-Al₂O₃ coating achieved highest value at 200 rpm. This result revealed that the corrosion resistance of Cr-Al₂O₃ coating decreases with increasing Al₂O₃ particles content.

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Solid State Science and Technology VII

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Periodical:

Solid State Phenomena (Volume 317)

Pages:

506-514

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.317.506

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Online since:

May 2021

Authors:

Eydar Tey*, Zulkarnain Zainal, Lim Kean Pah, Ismayadi Ismail

Keywords:

Aluminium Oxide, Chromium, Coating, Corrosion Resistance, Electrodeposition, Microhardness, Nanocomposite, Trivalent Chromium Bath

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