This research aims at investigating the corrosion behavior and hardness of AISI Stainless Steel 304 (AISI SS 304) in corrosive hydrochloric acid solution and temperature variation treatment. In this study, the samples of AISI SS 304 are immersed for six (6) days in the corrosive acid solution at the temperature of 30°C and 50°C. The solution used as the corrosive media are HCl, FeCl3, and NaCl in the concentration of 5%, 10% and 15%. The results show that the higher the concentration of the solution, the higher the corrosion rate of AISI SS 304 will be, and the higher the temperature, the higher corrosion rate will also occur in all corrosion media. The corrosion that occurs in AISI SS 304 is mostly in the form of uniform corrosion and some pitting corrosion, and the value of hardness decreases after corrosion.
ABSTRAKTongkol jagung merupakan salah satu limbah lignoselulosik yang banyak tersedia di Indonesia. Limbah lignoselulosik adalah limbah pertanian yang mengandung selulosa, hemiselulosa, dan lignin. Delignifikasi dapat dilakukan untuk melepaskan ikatan lignin dari suatu senyawa kompleks. Percobaan ini dilakukan untuk melepaskan ikatan lignin dengan menggunakan jenis pelarut berupa (H2SO4 / CH3COOH / NaOH), konsentrasi (0,5 % ; 1,5 % ; 2,5 %), suhu pemanasan 100 0 C dan waktu ekstraksi selama 60 menit. Dari hasil percobaan menunjukkan bahwa pelarut terbaik yang digunakan untuk memperbesar daya larut lignin ialah pelarut asam sulfat pada konsentrasi 1,5% yaitu sebesar 0,33%.
ABSTRACTCorncob is one of the most widely lignocellulosic waste in Indonesia. Lignocellulosic waste is such an agricultural waste containing cellulose, hemicellulose, and lignin. Delignification may be performed to release the lignin bonding from a Lignocellulosic complex compound. This study presents the method for assessment the release of lignin bond by using H2SO4, CH3COOH and NaOH as solvent, 100 0 C for the temperature and 60 menutes for ekstraction. From the experiment shows that the highest consentration is reached 0,33% by using 1,5% of sulfuric acid.
ABSTRAKTongkol jagung merupakan salah satu limbah lignoselulosik yang banyak tersedia di Indonesia. Limbah lignoselulosik adalah limbah pertanian yang mengandung selulosa, hemiselulosa, dan lignin. Delignifikasi dapat dilakukan untuk melepaskan ikatan lignin dari suatu senyawa kompleks. Percobaan ini dilakukan untuk melepaskan ikatan lignin dengan menggunakan jenis pelarut berupa (H2SO4 / CH3COOH / NaOH), konsentrasi (0,5 % ; 1,5 % ; 2,5 %), suhu pemanasan 100 0 C dan waktu ekstraksi selama 60 menit. Dari hasil percobaan menunjukkan bahwa pelarut terbaik yang digunakan untuk memperbesar daya larut lignin ialah pelarut asam sulfat pada konsentrasi 1,5% yaitu sebesar 0,33%.
ABSTRACTCorncob is one of the most widely lignocellulosic waste in Indonesia. Lignocellulosic waste is such an agricultural waste containing cellulose, hemicellulose, and lignin. Delignification may be performed to release the lignin bonding from a Lignocellulosic complex compound. This study presents the method for assessment the release of lignin bond by using H2SO4, CH3COOH and NaOH as solvent, 100 0 C for the temperature and 60 menutes for ekstraction. From the experiment shows that the highest consentration is reached 0,33% by using 1,5% of sulfuric acid.
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