Corrosion behaviour on AA2014/15vol. %A1₂0₃P and AA2009/20vol. %SiCw composite after ageing treatment
The purpose of this study is to compare the corrosion behaviour between AA2014/15vol. %A1₂0₃P and AA2009/20vol. %SiCw composites after ageing treatment. The former composite was cast composite supplied by Duralcan USA. The later composite was a powder metallurgy composites supplied by Advanced Compo...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/63454/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/63454/2/Full%20text.pdf |
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| Summary: | The purpose of this study is to compare the corrosion behaviour between AA2014/15vol. %A1₂0₃P and AA2009/20vol. %SiCw composites after ageing treatment. The former composite was cast composite supplied by Duralcan USA. The later composite was a powder metallurgy composites supplied by Advanced Composite
Materials Corporation USA. The corrosion behaviour was investigated by means of
immersion test and salt spray test. Before immersion test, the composites were
examined for ageing response at 16SoC (0 - 12hours). Microstructure evaluation has
been characterized using optical microscope, SEM and EDX. It was observed that the
distribution of SiC whiskers in the matrix AA2009 is more homogeneous compared to
the distribution of Ah03 particles in the matrix AA2014. The secondary phases such as
AhCu and AhCuMg were identified in AA20141l5vol. %A1₂0₃P whereas AhCu was
identified in AA2009/20vol. %SiCw composites after ageing. Localized corrosion is
more intense in AA2014/15vol. %Ah03p compared with AA2009120vol. %SiCw• The
pit shape for composite of AA20141l5vol. %A1₂0₃P is shallow wide pit and differs to
composite AA2009/20vol. %SiCw which is shallow deep pit. Salt spray test has been
used to assess the corrosion behaviour of the surface of as received composites. The
corrosion product has been analysis using XRD after salt spray test. The qualitative
diffraction pattern from both composites after 20 hours exposure in salt spray test shows the formation of the corrosion products. It was observed that three corrosion products were identified such as Mg (OHh, A1203, Mn02 in composite AA2014/15vol. %A1₂0₃P and no corrosion product was identified for composite AA2009/20vol. %SiCw. |
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