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

Received: 20 April 2015/Accepted: 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

REFERENCES

Amutha, K., Ravibaskar, R. & Sivakumar, G. 2010. Extraction, synthesis and characterization of nanosilica from rice husk ash. Int. J. Nanotech Appl. 4 : 61-66.

Aramaki, K. 2002. Synergistic inhibition of zinc corrosion in 0.5 M NaCl by combination of cerium(III) chloride and sodium silicate. Corrosion Science 44(4): 871-886.

Aramaki, K. 2001. Effect of organic inhibitors on corrosion of zinc in an aerated 0.5 M NaCl solution. Corrosion Science 43: 1985-2000.

Awizar, Denni Asra, Norinsan Kamil Othman, Azman Jalar & Abdul Razak Daud. 2013. Nanosilicate extraction from rice husk ash as green corrosion inhibitor. International Journal of Electrochemical Science 8: 1759-1769.

Conradi, M., Kocijan, A., Kek-Merl, D., Zorko, M. & Verpoest, I. 2014. Mechanical and anticorrosion properties of nanosilica-filled epoxy-resin composite coatings. Applied Surface Science 292: 432-437.

Della, V.P., Kühn, I. & Hotza, D. 2002. Rice husk ash as an alternate source for active silica production. Materials Letters 57: 818-821.

Duan, H., Du, K., Yan, C. & Wang, F. 2006. Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D. Electrochimica Acta 51: 2898-2908.

Duke, D.A. & Kubis, J.L. 2009. Cooling Water Corrosion Inhibition Method. United States Patent 7517493.

Gao, H., Li, Q., Chen, F.N., Dai, Y., Luo, F. & Li, L.Q. 2011. Study of the corrosion inhibition effect of sodium silicate on AZ91D magnesium alloy. Corrosion Science 53: 1401-1407.

Jiang, X., Jiang, Y.B., Liu, N., Xu, H., Rathod, S., Pratik Shah & Brinker, C.J. 2011. Controlled release from core-shell nanoporous silica particles for corrosion inhibition of aluminum alloys. Journal of Nanomaterials 2011: Article ID 760237.

Mohammed A. Amin, Sayed S. Abd El-Rehim, E.E.F. El-Sherbini & Rady S. Bayoumi. 2007. The inhibition of low carbon steel corrosion in hydrochloric acid solutions by succinic acid: Part I. weight loss, polarization, EIS, PZC, EDX and SEM studies. Electrochimica Acta 52(11): 3588-3600.

Phanasgaonkar, A. & Raja, V.S. 2009. Influence of curing temperature, silica nanoparticles- and cerium on surface morphology and corrosion behaviour of hybrid silane coatings on mild steel. Surface and Coatings Technology 203: 2260-2271.

Salasi, M., Shahrabi, T., Roayaei, E. & Aliofkhazraei, M. 2007. The electrochemical behaviour of environment-friendly inhibitors of silicate and phosphonate in corrosion control of carbon steel in soft water media. Materials Chemistry and Physics 104: 183-190.

Shchukin, D.G., Lamaka, S.V., Yasakau, K., Zheludkevich, M.L., Ferreira, M.G.S. & Möhwald, H. 2008. Active anticorrosion coatings with halloysite nanocontainers. Journal of Physical Chemistry C 112: 958-964.

Singh, D., Kumar, R., Kumar, A., Rai, K.N. 2008. Synthesis and characterization of rice husk silica, silica-carbon composite and H 3 PO4 activated silica. Cerâmica 54: 203-212.

Solmaz, R. 2014. Investigation of adsorption and corrosion inhibition of mild steel in hydrochloric acid solution by 5-(4-Dimethylaminobenzylidene)rhodanine. Corrosion Science 79: 169-176.

Thuadaij Nittaya & Apinon Nuntiya. 2008. Preparation of nanosilica powder from rice husk ash by precipitation method. Chiang Mai J. Sci. 35: 206-211.

Zandi-Zand, R., Ershad-Langroudi, A. & Rahimi, A. 2005. Silica based organic-inorganic hybrid nanocomposite coatings for corrosion protection. Progress in Organic Coatings 53: 286-291.

*Corresponding author; email: insan@ukm.edu.my