Sains Malaysiana 45(8)(2016): 1253–1258

Anticorrosive Properties of Nano Silicate from Paddy Husk in Salt Medium

(Sifat Antikakisan Nano Silikat daripada Sekam Padi dalam Medium Air Garam)

NORINSAN KAMIL OTHMAN*, SOLHAN YAHYA & DENNI ASRA AWIZAR

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 20 April 2015/Diterima: 25 November 2015

ABSTRACT

Anticorrosive properties of nano silicate from paddy husk in salt medium was investigated via weight loss method, Tafel polarization and impedance techniques. Prior to the corrosion test, the silica powder was obtained from burning the rice husk and extended with a chemical treatment process. The size of silica powder was characterized via zeta sizer and showed the amount of micro silica particle appear more than the nano size particle. Nano silica powder was produced from the refluxing process of micro silica to enhance the good properties of silica particle. The corrosion inhibition efficiency of nano silicate showed good inhibition with increased in inhibitor concentrations. Weight loss test exhibits high inhibition as more than 80% even, immersed in the corrosive medium until 14 days. The nano silicate inhibitor affected the anodic reaction as showed by Tafel plot analysis. Impedance results also correlated with other test as shown by the large size of Nyquist semicircle which represents as high resistance of charge transfer. The surface morphology of inhibited specimen showed a smooth surface after nano silicate inhibitor applied in the NaCl medium as observed through scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX).

Keywords: Carbon steel; corrosion inhibitor; impedans; nano silicate; SEM-EDX

ABSTRAK

Sifat antikakisan bagi nano silikat daripada sekam padi dalam medium garam telah dikaji melalui kaedah ujian kehilangan berat, pengutuban Tafel dan impedans. Sebelum ujian kakisan dijalankan, serbuk silika diperoleh daripada pembakaran sekam padi dan dilanjutkan dengan proses rawatan kimia. Saiz serbuk silika dicirikan menerusi pengukur zeta dan keputusan mendedahkan bahawa jumlah zarah mikro silika adalah lebih banyak daripada zarah bersaiz nano. Serbuk nano silka dihasilkan daripada proses refluks serbuk mikro silika untuk meningkatkan sifat baik zarah silika. Perencatan kakisan oleh nano silikat menunjukkan keputusan kecekapan yang baik dengan peningkatan kepekatan nano silikat. Ujian kehilangan berat mempamerkan kecekapan setinggi lebih 80% walaupun direndam dalam medium mengakis sehingga 14 hari. Perencat nano silikat didapati memberi kesan terhadap tindak balas anodik seperti yang dinyatakan dalam analisis plot Tafel. Keputusan impedans memberikan korelasi yang sama dengan ujian lain seperti mana yang ditunjukkan oleh saiz separuh bulatan Nyquist yang besar yang mewakili kerintangan pemindahan cas yang tinggi. Morfologi permukaan spesimen yang direncatkan menunjukkan permukaan yang licin selepas nano sillikat digunakan dalam medium NaCl sepertimana yang diperhatikan menerusi mikroskopi elektron imbasan (SEM) dan spektroskopi tenaga-serakan sinar-x (EDX).

Kata kunci: Keluli karbon; impedans; nano silikat; perencat kakisan; SEM-EDX

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*Pengarang untuk surat-menyurat; email: insan@ukm.edu.my