Sains Malaysiana 43(6)(2014):
935–940
Surface
Morphology Study on Aluminum Alloy after Treated with Silicate-Based Corrosion
Inhibitor from
Paddy Residue
(Kajian Morfologi
Aloi Aluminium Selepas Dirawat dengan Perencat Kakisan
Berasaskan
Sisa Padi)
N. MOHAMAD, A. JALAR
& N.K. OTHMAN*
School of Applied Physics,
Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi,
Selangor D.E., Malaysia
Diserahkan: 21 Mac 2013/Diterima:
1 Mac 2014
ABSTRACT
Aluminum alloys have extensive applications
in engineering structures like aircraft due to their high strength-to-weight
ratio. However, these alloys are very reactive and prone to corrosion attack.
Paddy waste is one of the beneficial natural sources that have a potential
contribution on inhibiting the corrosion attack. At 600°C, silica was obtained
from rice husk ash. The chemical reaction between silica powders with
concentrated alkali generates formulation of potential silicate-based corrosion
inhibitor. The potentiodynamic polarization, optical microscope (OM),
infinite focus microscope (IFM) and scanning electron microscopy
(SEM)
were employed to investigate the corrosion behaviour of Al 6061 through
electrochemical and surface study. The electrochemical measurement showed that
the existence of silicate-based corrosion inhibitor in 0.5 M hydrochloric acid
medium significantly mitigates the corrosion rates. SEM, IFM and OM showed that the morphology of untreated Al 6061 contributes more
damage on the sample surface than that of Al 6061 treated with silicate-base
corrosion inhibitor. The aim of this study was to attain better understanding
of surface study on corrosion behaviour of aluminum alloy in acidic medium
after treated and untreated with silicate-based corrosion inhibitor from paddy residue.
Keywords: Aluminum alloy; corrosion
inhibitor; silicate
ABSTRAK
Aloi aluminium mempunyai aplikasi yang
luas dalam bidang kejuruteraan struktur seperti pesawat kerana mempunyai
nisbah kekuatan-kepada-berat yang tinggi. Walau bagaimanapun, aloi
ini adalah sangat reaktif dan cenderung kepada serangan kakisan.
Sisa padi adalah salah satu sumber semula jadi yang bermanfaat dan
mampu memberi sumbangan yang berpotensi menghalang serangan kakisan.
Pada 600°C, silika diperoleh daripada abu sekam padi. Tindak
balas kimia antara serbuk silika dengan alkali pekat menjana formulasi
berpotensi bertindak sebagai perencat kakisan berasaskan silikat.
Pengutuban potentiodinamik, optik mikroskop (OM),
infiniti fokus mikroskop (IFM) dan imbasan elektron mikroskop (SEM)
telah digunakan untuk mengkaji perilaku kakisan Al 6061 melalui
kajian elektrokimia dan permukaan. Pengukuran elektrokimia menunjukkan
bahawa kewujudan perencat kakisan berasaskan silikat dalam medium
0.5 M asid hidroklorik menyebabkan kadar kakisan berkurangan secara
ketara. SEM,
IFM
dan OM menunjukkan bahawa morfologi Al 6061
yang tidak dirawat menyumbang lebih banyak kerosakan pada permukaan
sampel berbanding Al 6061 yang dirawat dengan perencat kakisan berasaskan
silikat. Tujuan kajian ini adalah untuk mencapai pemahaman yang
lebih jelas melalui kajian permukaan berdasarkan kelakuan kakisan
aloi aluminium dalam medium berasid setelah dirawat dan tidak dirawat
dengan perencat kakisan berasaskan silikat daripada sisa padi.
Kata kunci: Aloi aluminium; kakisan perencat; silikat
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*Pengarang untuk
surat-menyurat; email: insan@ukm.edu.my
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