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Corrosion
Protection of Carbon Steel Using Polyaniline Composite with Inorganic Pigments
(Perlindungan
Kakisan Keluli Karbon Menggunakan Komposit Polianilin dengan Pigmen Inorganik)
Ahmed A. Al-Dulaimi*, Shahrir Hashim
& M.I. Khan
Department of Polymer Engineering, Faculty of Chemical and
Natural Resources Engineering
Universiti Teknologi Malaysia, UTM 81310 Skudai, Johor,
Malaysia
Diserahkan: 23 Oktober 2009 / Diterima: 25 September 2010
ABSTRACT
Two
inorganic pigments (TiO2 and SiO2)
were used to prepare composites with polyaniline (PANI)
by situ polymerization method. PANI and PANI composites
with SiO2 and TiO2 were characterized using
Fourier transform infrared spectroscopy and X-ray diffraction. The morphology
of the synthesized pigments (PANI , PANI-SiO2 and PANI-TiO2)
was examined using scanning electron microscopy. Samples were then used as
pigments through blending them with acrylic paint and applied on the surface of
carbon steel panels. Corrosion was evaluated for coating of carbon steel panels
through full immersion test up to standard ASTMG 31.
Mass loss was calculated after they have been exposed in acidic media. A
digital camera was also used for monitoring corrosion visually on the surface
of carbon steel specimens. The results revealed that acrylic paint pigmented by PANI-SiO2 composite
was more efficient in corrosion protection for carbon steel compared with the
other synthesized pigments.
Keywords:
Composite pigments; corrosion protection; polyaniline
ABSTRAK
Dua
pigmen inorganik TiO2 dan SiO2 digunakan
untuk menghasilkan komposit dengan polianilin (PANI)
dengan kaedah pempolimeran situ. PANI dan PANI komposit
dengan (SiO2, TiO2) dicirikan menggunakan
spektroskopi transformasi Fourier inframerah dan pembelau sinar-X. Mikroskop
elektron imbasan digunakan untuk memerhatikan morfologi pigmen sintesis (PANI, PANI-SiO2 dan PANI-TiO2).
Sampel kemudian digunakan sebagai pigmen melalui pencampuran dengan cat akrilik
dan diterapkan pada permukaan panel keluli karbon. Kakisan dinilai untuk
lapisan panel keluli karbon melalui perendaman penuh mengikut piawaian ASTM G31. Kehilangan jisim dikira selepas didedah kepada medium
berasid. Kamera digital juga digunakan untuk pemantauan visual kakisan pada
permukaan spesimen keluli karbon. Keputusan kajian menunjukkan bahawa cat
akrilik berpigmen PANI-SiO2 komposit
lebih cekap dalam perlindungan kakisan untuk keluli karbon berbanding dengan
pigmen lain yang disintesis.
Kata kunci: Perlindungan kakisan; pigmen komposit; polianilin
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*Pengarang untuk surat-menyurat; email:
ahmed_kareem79@yahoo.com
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