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005			20251125110917.0
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008			240820t20242024my a|||fr|||| 000 0 eng d
020			_aTHE0009913 (Local) _qHardback
040			_aUMPSA _beng _cUMP _erda
090			_aFTKMA .A55 2024 r Thesis
100	1		_aNur Anis Nabila Bt Mokhtar, _eauthor.
245	1	0	_aMicrostructure and corrosion analysis of coated bulk nanostructured aluminium alloy 6061 / _cNur Anis Nabila Bt Mokhtar
264		1	_aKuantan, Pahang : _bUMPSA, _c2024
264		4	_c© 2024
300			_axviii, 144 pages : _billustrations ; _30 cm. +30 cm. + _e1 CD-ROM
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
338			_2rdacarrier _avolume
347			_2rda _atext file _bPDF
500			_aFaculty of Mechanical and Automotive Engineering Technology
502			_aThesis (Master of Science) -- Universiti Malaysia Pahang – 2024
504			_aIncludes bibliographical references
520	3		_aEqual Channel Angular Pressing (ECAP) is an improved technique in the metal forming process that imposes a high strain to produce ultra-fine grain structure of metal from coarse grain structure for grain refinement without changing its dimension. In this research, the effect of ECAP on the microstructure, hardness and corrosion properties of the aluminium alloy 6061 (AA6061) is investigated. Subsequently, the impact of nanostructuring of AA6061 on zirconia coating behaviour is evaluated. AA6061 was subjected to ECAP processing at two different channel angles which are 120° and 126°. The ECAP-ed samples then were coated with zirconia coating through sol-gel-assisted dip coating at 3 and 7 layers. The microstructure, hardness and corrosion behaviour of coated and non-coated samples were then evaluated. Hardness test has shown the increment in hardness for coated samples with the highest hardness observed 7layer coated ECAP 126°. The open circuit potential and Tafel curve from potentiodynamic results also indicate the corrosion resistance of ECAP-coated samples has improved. Microstructure evaluation of ECAP samples processed at 126° has finer microstructure compared to samples processed at 120°. ZrO2 coating on the ECAP samples also were observed to be more compact with no cracks observed. Grain refinement due to ECAP processing has been identified as the driving force for the improved mechanical and corrosion properties of the AA6061. The various dislocations and grain boundaries in the UFG substrate provide an accelerated driving force for hydrothermal reaction, promoting the creation of a thicker and more compact ZrO2 coating layer. Such a protective coating layer along with the annealed substrate with fewer crystal defects effectively retards the deterioration of corrosion and consequently maintains mechanical efficiency. This suggests that the ECAP processing was able to interact with zirconia thin film which improves adherent properties, thus improving the hardness and corrosion resistance of the samples.
610	2	0	_aFaculty of Mechanical and Automotive Engineering Technology _xDissertations
650		0	_aUniversities and colleges _xDissertations
650		0	_aTheses _xDissertations
942			_2lcc _cTHESIS