Sains Malaysiana 48(2)(2019): 401–406

http://dx.doi.org/10.17576/jsm-2019-4802-18

Kesan Pemendapan Elektroforesis Gam Arab terhadap Halaju Kakisan pada Aluminium 5052

(Electrophoresis Deposition Arabic Gum Effect on Aluminium 5052 Reduce Corrosion)

I GUSTI AYU ARWATI^1,3, EDY HERIANTO MAJLAN^1*, WAN RAMLI WAN DAUD^1,2, LOH KEE SHYUAN¹, KHUZAIMAH BINTI ARIFIN¹, TEUKU HUSAINI¹, SAGIR ALVA³ & NABILAH AFIQAH MOHD RADZUAN¹

¹Institut Sel Fuel, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Pusat Penyelidikan Teknologi Proses Mampan, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

³Mechanical Engineering Department, Engineering Faculty, Mercu Buana University, 11650 Jakarta, Indonesia

Diserahkan: 9 Julai 2018/Diterima: 29 September 2018

ABSTRAK

Plat dwikutub adalah salah satu komponen utama sel fuel membran pertukaran proton (PEMFC). Aloi aluminium (Al5052) merupakan salah satu logam yang digunakan sebagai plat dwikutub kerana mempunyai kekonduksian yang tinggi dan ringan. Namun, sistem PEMFC yang berasid (pH3-6) adalah mudah untuk bahan Al5052 mengalami kakisan sehingga dapat mengurangkan prestasi PEMFC. Oleh itu, bagi mengurangkan halaju kakisan yang berlaku, kajian ini menggunakan perencat hijau gam Arab dengan kaedah pemendapan elektroforesis (EPD). Kesan kakisan plat Al5052 bersalut 0.5 gL-1 gam Arab di dalam larutan sulfurik asid diuji menggunakan kaedah elektrokimia dan ujian morfologi. Hasil ujian morfologi permukaan Al5052 yang bersalut gam Arab terlihat lebih halus dan homogen berbanding permukaan yang tidak disalut serta hasil keratan rentas ketebalan salutan adalah antara 7.5 μm sehingga 8.8 μm. Kesan peningkatan suhu (30ºC sehingga 90ºC) terhadap nilai rintangan hubungan antara muka (ICR) pada Al5052 yang tidak bersalut akan menurun daripada 11.8552 sehinggs 9.9042 mΩ cm2 manakala yang bersalutkan gam Arab mempunyai nilai daripada 13.3497sehingga 11.812 mΩ cm2. Keputusan menunjukkan bahawa gam Arab dapat memberikan perlindungan terhadap permukaan logam yang apabila pengujian menggunakan kaedah polarisasi linear tafel dalam larutan 0.5 M H2SO4 (pH4) menunjukkan nilai ketumpatan arus kakisan (Icorr) semakin menurun daripada 0.00264 kepada 0.00012 μA cm-2. Selain itu, halaju kakisan turut menurun daripada 3.06 × 10-5 mpy kepada 1.61 × 10-6 mpy setelah disalut gam Arab. Kesimpulannya, gam Arab dan kaedah salutan EPD boleh digunakan bagi mengurangkan halaju kakisan pada plat Al5052, supaya jangka hayat bahan ini lebih panjang dan boleh mencapai piawai yang ditetapkan oleh DOE untuk plat dwikutub.

Kata kunci: Aluminium 5052; ketumpatan arus kakisan; pemendapan elektroforesis; perencat hijau gam arab; plat dwikutub; rintangan hubungan antara muka

ABSTRACT

Bipolar plates are one of the main components of proton exchange membrane fuel cells (PEMFC). Aluminum alloy (Al5052) is one of the metals used as a bipolar plate because it has a high conductivity, light weight. However, the acidic PEMFC system (pH3-6) is easy for Al5052 ingredients to experience corrosion so as to reduce PEMFC achievement. Therefore, in order to reduce the prevailing sidewalks, this study used a green Arabic gum inhibitor with an electrophoresis deposition (EPD). The impression of a 0.5 gL-1 Arabic gum-coated Al5052 plate sidewalk in the sulphuric acid solution was tested using an electrochemical method and a morphological test. The surface morphology of Al5052 coated with Arabic gum appeared to be smoother and homogeneous compared to uncoated surface and the cross section of the coating thickness was between 7.5 μm and 8.8 μm. Effect of temperature increase (30ºC - 90ºC) on the interfacial contact resistance (ICR) value of the uncoated Al5052 will decrease from 11.8552 to 9.9042 mΩ cm2 where the Arabic gum coated has a value of 13,3497 to 11,812 mΩ cm2. The results showed that Arabic gum can provide protection against metal surfaces where the test using linear tafel polarization technique in 0.5 M H2SO4 (pH4) solution with corrosion current value (Icorr) decreased from 0.00264 to 0.00012 μA cm-2. Despite that, the corrosion rate reduced from 3.06 × 10-5 mpy to 1.61 × 10-6 mpy as being coted with Arabic gum. It can be concluded that Arabic gum and coating techniques with EPD can be used to reduce corrosion on the Al5052 plate, therefore, the life span of this material is longer and may reach the targets set by the DOE for bipolar plates.

Keywords: Aluminium 5052; bipolar plates; corrosion current density; electrophoresis deposition; green inhibitor arabic gum; interfacial contact resistance

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