Sains Malaysiana 45(2)(2016): 271–277

Analisis Keberkesanan Benziltrietilamonium Klorida sebagai Perencat

Kakisan bagi Perlindungan Keluli Karbon

(Efficiency Analysis of Benzyltriethylammonium Chloride as Corrosion Inhibitor

for Carbon Steel Protection)

Mohd Nazri Idris*¹², Abdul Razak Daud¹ & Norinsan Kamil Othman¹

¹Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia,

43600 Bangi, Selangor Darul Ehsan, Malaysia

²Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral, Kampus Kejuruteraan, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia

Diserahkan: 1 Julai 2014/Diterima: 1 Julai 2015

ABSTRAK

Keberkesanan perencatan benziltrietilamonium klorida (BK) terhadap perlindungan kakisan keluli karbon di dalam 1 M asid asetik telah dianalisis dengan menggunakan kaedah ujian kehilangan berat. Matlamat kajian adalah untuk menilai tahap kecekapan perencatan BK berdasarkan perubahan nilai kepekatan perencat berkenaan dan suhu. Analisis kehilangan berat menunjukkan kadar kakisan keluli karbon berjaya dikurangkan dengan penggunaan kepekatan BK yang lebih tinggi dan nilai kecekapan perencatan BK mencapai sehingga 70%. Namun kadar kakisan didapati meningkat selari dengan peningkatan suhu. Analisis termodinamik mendapati perencatan BK berjaya mengurangkan proses pelarutan ion-ion logam melalui pembentukan lapisan filem nipis pada permukaan keluli karbon. Analisis juga menunjukkan sebatian BK berupaya menjerap pada permukaan keluli karbon melalui kedua-dua kaedah penjerapan fizikal dan kimia. Proses penjerapan BK pada permukaan keluli karbon didapati lebih menjurus kepada model isoterma penjerapan Langmuir. Analisis morfologi menggunakan mikroskop imbasan elektron turut mengesahkan berlakunya perencatan BK pada tapak permukaan keluli karbon. Keseluruhan kajian mendapati sebatian BK berupaya melindungi keluli karbon daripada mengalami kakisan di dalam medium asid asetik.

Kata kunci: Kecekapan perencatan; keluli karbon; penjerapan; perencat kakisan

ABSTRACT

Inhibition efficiency of benzyltriethylammonium chloride (BK) for carbon steel protection in 1 M acetic acid has been analyzed by weight loss method. The objective of this study was to evaluate the inhibition efficiency of BK by varying the concentration and temperature. Weight loss analysis showed that corrosion rate of carbon steel was successfully reduced as the inhibitor concentration increased and the inhibition efficiency up to 70% has been achieved. Meanwhile, the corrosion rate increased with the rise of temperature. Analysis of thermodynamic indicated that this inhibitor had a potential to reduce the dissolution process of metallic ions by forming a thin film layer on the steel surface. It was proven that BK is able to adsorb on the carbon steel surface by both physisorption and chemisorption processes. The adsorption process was seen to follow Langmuir adsorption isotherm. Morphology analysis by scanning electron microscope also confirmed that inhibition process occurred at the surface of carbon steel. This study showed that BK is capable of protecting carbon steel from actively corrode in acetic acid.

Keywords: Adsorption; carbon steel; corrosion inhibitor; inhibition efficiency

RUJUKAN

Akrout, H., Bousselmi, L., Maximovitch, S., Triki, E. & Dalard, F. 2012. Adsorption of corrosion inhibitors (SA, HEDP) using EQCM: Chloride effect and synergic behavior. Journal of Materials Science 47(23): 8085-8093.

Al-Sabagh, A.M., Kandil, N.G., Ramadan, O., Amer, N.M., Mansour, R. & Khamis, E.A. 2011. Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl. Egyptian Journal of Petroleum 20(2): 47-57.

Behpour, M., Ghoreishi, S.M., Mohammadi, N., Soltani, N. & Salavati-Niasari, M. 2010. Investigation of some Schiff base compounds containing disulfide bond as HCl corrosion inhibitors for mild steel. Corrosion Science 52(12): 4046- 4057.

Elsentriecy, H.H., Azumi, K. & Konno, H. 2007. Effect of surface pretreatment by acid pickling on the density of stannate conversion coatings formed on AZ91 D magnesium alloy. Surface and Coatings Technology 202(3): 532-537.

Foss, M., Diplas, S. & Gulbrandsen, E. 2010. Mechanistic study of adsorption of cetyltrimethyl ammonium bromide on high purity iron using contact angle, polarization resistance and XPS. Electrochimica Acta 55(17): 4851-4857.

Fuchs-Godec, R. 2006. The adsorption, CMC determination and corrosion inhibition of some N-alkyl quaternary ammonium salts on carbon steel surface in 2 M H2SO4. Colloids and Surfaces A: Physicochemical and Engineering Aspects 280(13): 130-139.

Idris, M.N., Daud, A.R., Othman, N.K. & Jalar, A. 2013. Corrosion control by benzyl triethylammonium chloride: Effects of temperture and its concentration. International Journal of Engineering & Technolgy 13(3): 47-51.

Popova, A., Christov, M., Vasilev, A. & Zwetanova, A. 2011. Mono- and dicationic benzothiazolic quaternary ammonium bromides as mild steel corrosion inhibitors. Part I: Gravimetric and voltammetric results. Corrosion Science 53(2): 679-686.

Portier, S., Andre, L. & Vuatez, F.D. 2007. Review on Chemical Stimulation Techniques in Oil Industry and Applications to Geothermal Systems. Enhanced Geothermal Innovative Network for Europe Work Package 4: Drilling, stimulation and reservoir assessment Participant No 28: Deep Heat Mining Association – DHMA, Switzerland. pp. 1-32.

Riggs, O.L. & Hurd, R.M. 1967. Temperature coefficient of corrosion inhibitor. Corrosion (NACE) 23: 252-258.

Sartor, M., Buchloh, D., Rogener, F. & Reichardt, T. 2009. Removal of iron fluorides from spent mixed acid pickling solutions by cooling precipitation at extreme temperatures. Chemical Engineering Journal 153(1-3): 50-55.

Shokry, H., Yuasa, M., Sekine, I., Issa, R.M., El-Baradie, H.Y. & Gomma, G.K. 1998. Corrosion inhibition of mild steel by Schiff base compounds in various aqueous solutions: Part 1. Corrosion Science 40(12): 2173-2186.

Tang, Y., Zhang, F., Hu, S., Cao, Z., Wu, Z. & Jing, W. 2013. Novel benzimidazole derivatives as corrosion inhibitors of mild steel in the acidic media. Part I: Gravimetric, electrochemical, SEM and XPS studies. Corrosion Science 74: 271-282.

Zhu, S.D., Fu, A.Q., Miao, J., Yin, Z.F., Zhou, G.S. & Wei, J.F. 2011. Corrosion of N80 carbon steel in oil field formation water containing CO2 in the absence and presence of acetic acid. Corrosion Science 53(10): 3156-3165.

*Pengarang untuk surat menyurat; email: nazriselama@gmail.com