Sains Malaysiana 49(12)(2020): 3169-3177

http://dx.doi.org/10.17576/jsm-2020-4912-28

The Influence of Temperature and Electroforesis Deposition Green Inhibitor on Bipolar Plate AA5052 in Sulfuric Acid Medium

(Pengaruh Suhu dan Endapan Elektroforesis Perencat Hijau pada Plat Dwikutub AA5052 dalam Asid Sulfurik)

I GUSTI AYU ARWATI^1,3, EDY HERIANTO MAJLAN¹*, LOH KEE SHYUAN¹, TEUKU HUSAINI¹, SAGIR ALVA³, MUHAJIRIN³ & NABILAH AFIQAH MOHD RADZUAN²

¹Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

³Engineering Faculty, Mercu Buana University, 11650 Jakarta Barat, Indonesia

Diserahkan: 4 Ogos 2020/Diterima: 11 September 2020

ABSTRACT

Aluminum alloy 5052 (AA5052) contains Mg (2.2-2.8.8% weight), Cu (0.1% weight), Cr (0.15% weight), Zn (0.1% weight), Si and Fe (0.45% weight) compositions. This material has been widely used as a bipolar plate in Proton exchange Membrane (PEMFC) fuel cells. This material has several advantages such as: lightness, high conductivity, good tensile strength, and flexibility. PEMFC operations produce several by-products, such as water and heat. Generally, the operation of PEMFC is around 333-353 K and the environment is acidic. In this condition the bipolar plate AA5052 will easily experience rust, thus lowering the performance of the PEMFC. In this study, 0.5 g/L Arabic Gum (AG) used as a green inhibitor and coated onto the AA5052 surface through electrophoretic deposition (EPD). The corrosion test was performed in 0.5 M H₂SO₄ (pH 2) solution under the simulated PEMFC condition. Scanning electron microscopy (SEM) was used to analyze the morphology, and potentiodynamic polarization to determine the corrosion rate. Result shows that AG coating can reduce 60% the corrosion rate of AA5052 after immersed in 0.5 M H₂SO₄ for 168 h. The effect of temperature on the inhibition efficiency reached 14.4% under the same condition. AG can be used as a green inhibitor to reduce the corrosion rate of AA5052 bipolar plate.

Keywords: Aluminum alloy 5052; Arabic Gum inhibitor; corrosion rate; electrophoretic deposition

ABSTRAK

Aloi aluminium 5052 (AA5052) mengandungi komposisi Mg (2.2-2.8.8% berat), Cu (0.1% berat), Cr (0.15% berat), Zn (0.1% berat), Si dan Fe (0.45% berat). Bahan ini telah digunakan secara meluas sebagai plat dwikutub untuk sel fuel membran pertukaran proton (PEMFC). Bahan ini digunakan kerana kelebihannya, seperti ringan, kekonduksian tinggi, kekuatan tegangan yang baik dan kefleksibilannya. Operasi PEMFC menghasilkan beberapa produk sampingan seperti air dan haba. Secara amnya, PEMFC beroperasi pada suhu 333-353 K dan mempunyai persekitaran yang berasid. Plat dwikutub AA5052 ini akan mudah mengalami karat, sehingga menurunkan prestasi PEMFC. Dalam kajian ini, 0.5 g/L Gam Arab (GA) digunakan sebagai perencat hijau dan dilapisi ke permukaan AA5052 melalui pemendapan elektroforetik (EPD). Ujian kakisan dilakukan dalam larutan 0.5 M H₂SO₄ (pH 2) sesuai dengan simulasi keadaan PEMFC. Mikroskopi elektron imbasan (SEM) digunakan untuk menganalisis morfologi dan polarisasi potensiodinamik untuk menentukan kadar kakisan. Hasil menunjukkan bahawa lapisan AG dapat mengurangkan 60% kadar kakisan AA5052 setelah direndam dalam 0.5 M H₂SO₄ selama 168 jam. Kesan suhu pada kecekapan penghambatan mencapai 14.4% dalam keadaan yang sama. AG boleh digunakan sebagai perencat hijau untuk mengurangkan kadar kakisan AA5052.

Kata kunci: Aloi aluminium 5052; kadar kakisan; pemendapan elektroforesis; perencat Gam Arab

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*Pengarang untuk surat-menyurat; email: edyhm71@gmail.com