Aluminum AA5052 is an inexpensive and lightweight metal that has been used in a variety of applications, including the Bipolar Plate in Proton Exchange Membrane Fuel Cells (BPs PEMFC). The alloy has good electrical conductivity and low corrosion. Corrosion rate (CR) increases during PEMFC operation with increasing temperature. Inorganic dyes, such as chromate, are commonly used to reduce metal corrosion. Unfortunately, they are toxic and have a negative impact on the environment. Chitosan, which is a green, cheap, non-toxic, and environmentally friendly organic solvent, can be used to solve this problem. Electrophoretic Deposition (EPD) technique was used to coated the surface of AA5052 with chitosan. CR was measured using electrochemical and weight loss methods (in 0.5 M H2SO4). The best research results are as follows. The lowest CR values were obtained at the EPD time of 20 min at a chitosan concentration of 0.5% wt. The results of the study using the weight loss method indicated that after soaking for 72 hours, the chitosan inhibitor can reduce the corrosion rate (CR) with an inhibitor efficiency of 87.89%, while the electrochemical method obtained a higher efficiency of 95.12%. An increase in temperature will result in a decrease in the efficiency of the inhibitor. Testing with SEM-EDX, after being coated with chitosan inhibitor, the metal surface looks smoother and the Al composition is reduced and it is detected that there is adsorption of O, N and S elements that coated the metal to form insoluble complex compounds, so the corrosion rate decreases.
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 cm 2 manakala yang bersalutkan gam Arab mempunyai nilai daripada 13.3497sehingga 11.812 mΩ cm 2. Keputusan menunjukkan bahawa gam Arab dapat memberikan perlindungan terhadap permukaan logam yang apabila pengujian menggunakan kaedah polarisasi linear tafel dalam larutan 0.5 M H 2 SO 4 (pH4) menunjukkan nilai ketumpatan arus kakisan (I corr) 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.
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.
The program of development and application of appropriate technology to recycle waste is executed by SMEs Bank Sampah (Waste Bank) Bumi Hijau Cemerlang Desa Suradita Tanggerang. The team was established since 2015. The management of this waste bank foundation is always energetic and productive so as they are competent to collect 200 kg inorganic waste (plastic and paper) in one week. On the other side, they did recycling liquid fertilizer from organic waste by using the used composter. This action is performed by realizing the fact that household waste matter gets heaped and malignant towards environment. The are problems faced by the team. Providing learning assistance in the form of appropriate technology tools and how to use them. In order to ensure the successful of this program, evaluation is carried out in every step of the program’s development.
Stainless steel 316L (SS316L) has the potential to be used as a bipolar plate for proton exchange membrane fuel cells (PEMFCs). SS316L has good electrical conductivity and passivity, but if used in acidic environments (pH 3-6), passivity will changed and cause corrosion. In this study, green inhibitor with an electrophoresis desposition (EPD) technique was used to reduce the corrosion of SS316L plates. The results of the scanning electron microscope (SEM) analysis show that the SS316L surface is smoother and thicker, with a thickness of between 4.9-8.9 μm. Testing using linear polarization Tafel method in 0.5 M H 2 SO 4 medium, found that the corrosion current value (I corr) decreased with the presence of the coating i.e. from 18.484 μA / cm 2 to 0.859 μA / cm 2 , SS316L corrosion rate without coating is 0.7172 mpy, whereas SS316L coated with arabic gam has a lower corrosion rate of 0.033 mpy. From this study, the finding of this study showed that arabic gum with EPD coating technique can provide corrosion protection against the surface of SS316L.
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