Effect of the addition of inhibitors of kirinyuh leaf (Chromolaena Odorata) in methanol extract on corrosion rate of ASTM 36 steel

Kirinyuh leaves (Chromolaena Odorata) contain alkaloids, saponins, flavonoids, phenols, and tannins with the potential as a natural inhibitor that can be used to inhibit the rate of corrosion. Kirinyuh leaf extract inhibitors were added at various concentrations of 100 ppm, 200 ppm, 300 ppm, 400 ppm, and 500 ppm, which were sprayed onto the sample surface before being soaked for seven days. Calculation of the corrosion rate using the method of weight loss (weight loss). The results showed that kirinyuh leaf extract effectively inhibited the corrosion rate. The smallest corrosion rate value was found in the sample with the addition of 400 ppm inhibitor concentration, which was 2.053 ppm. Meanwhile, an efficiency inhibitor was also found in the same concentration of inhibitor that is equal to 87%

Waste cellulose extraction and analysis decortication sisal plant (Agave sisalana) Sumbawa Labangka

Waste utilization of decortication Sisal plants is minimal compared to the amount of waste produced, especially the cellulose content in the waste decortication sisal plant. This research aims to extract waste cellulose decortication sisal plants using acid and alkaline solutions with variations in NaOH solutions of 0%, 2%, 4%, 6%, and 8%. The process used is alkalization, bleaching, and acid hydrolysis by method analysis. Next, testing using SEM and FTIR methods is done to determine the morphology of waste cellulose decortication in the resulting sisal plants and the cellulose, lignin, and hemicellulose content in the waste decortication sisal plant. Before treatment, the cellulose content of the waste is given to decorticate the sisal plant at 31%, and after alkalization treatment, the cellulose content is 54%. Cellulose content in waste decortication Sisal plants in each process increases with found O-H bonds at waves 3000-3600 cm-1, C-H bonds belong to hemicellulose at wave numbers 2800-3000 cm-1 and remove lignin, which is in the waste decortication Sisal plants did not find C=C bonds belonging to lignin at waves of 1200-1300 cm-1. FTIR test results show an increase in cellulose intensity, with the resulting cellulose measuring 28.64762 µm and 33.69369 µm. The increase in cellulose intensity in FTIR is directly proportional to the SEM results, which show a loose layer with lignin and hemicellulose that has been eroded from the cellulose

Pengaruh Ukuran Partikel, Persen Padatan, dan pH pada Proses Flotasi Terhadap Perolehan Kembali Tembaga

Flotasi merupakan proses ekstraksi logam berdasarkan perbedaan tegangan permukaan dari mineral di dalam air dengan cara mengapungkan mineral ke permukaan. Faktor yang mempengaruhi nilai perolehan kembali Tembaga antara lain ditentukan oleh ukuran partikel, jumlah persen padatan dan kondisi larutan. Pada penelitian ini akan dilakukan pengamatan terhadap perolehan kembali mineral tembaga dengan melakukan variasi ukuran partikel, variasi persen padatan pada jumlah 33%, 42% dan 47% dan variasi pH larutan pada kondisi basa yaitu pH 10, 10.3 dan 10.6. Pengecilan ukuran partikel dilakukan dengan proses Grinding sampai mendapatkan ukuran + 212 mikron. Selanjutnya, pH larutan dikontrol dengan penambahan kapur. Analisis perolehan kembali mineral tembaga secara kuantittatif dilakukan dengan karakterisasi AAS. Hasil penelitian menunjukkan bahwa ukuran partikel yang optimum didapat pada pada variasi 3% +212 mikron dengan nilai 95.12%. Sedangkan, jumlah persen padatan 42% memberikan nilai tertinggi yaitu 95.12%. Selanjutnya, diperoleh pH terbaik untuk memperoleh tembaga yang optimum yaitu pada pH 10.6 sebesar 95.12

Strategi Pemasaran Digital Produk UMKM Paguyuban Kampung Bejo Dengan Aplikasi Linktree Dan Media Sos

Perkembangan perdagangan yang terjadi saat ini adalah efek langsung adanya teknologi. Adanya perkembangan teknologi menjadikan para pelaku Usaha Mikro Kecil dan Menengah (UMKM) menawarkan barangnya secara online untuk meningkatkan hasil produknya ke konsumen sehingga akan meningkatkan pendapatannya. Perkembangan teknologi juga memungkinkan lebih banyak konsumen mengetahui produk-produk yang dijual oleh para produsen. Hal ini memudahkan konsumen untuk menemukan informasi tentang barang yang dijual oleh produsen. Program pendukung seperti aplikasi linktree dapat digunakan untuk mengaplikasikan informasi tersebut. Linktree adalah program yang bagus, dimana aplikasi ini bisa membuat tautan link pada satu landing page saja. Namun kenyataannya, banyak UMKM yang tidak menyadari hal tersebut, termasuk UMKM Paguyuban Kampung Bejo di Kelurahan Arjowinangun. Maka, tim pengabdian masyarakat membantu UMKM mengatasi permasalahan dengan memberikan sosialiasi pelatihan strategi pemasaran dengan aplikasi linktree dan media sosiak. Pendekatan dilakukan dengan cara Focus Group Discussion (FGD) yang dihadiri oleh 21 UMKM pada Selasa, 11 Juli 2023 di Kelurahan Arjowinangun. Hasil dari kegiatan ini yaitu para pelaku UMKM sangat bersemangat dan mempraktekkan pembuatan aplikasi Linktree secara langsung. Diharapkan dengan adanya aplikasi Linktree ini dapat memudahkan para pelaku UMKM dalam menjual produknya sehingga lebih dikenal oleh konsumen dan mendapatkan keuntungan yang lebih banyak

Effect of Sintering and Various Fillers in Zirconia Composite Coating for High Temperature Application

Zirconia is a ceramic material that is relatively cheap and easy to purify from mineral form. Zirconia powder has stable properties under high temperature conditions making it suitable for use as a coating for steel substrates. Ceramic composite coating is one option that can be used to increase its durability by adding filler which has lubricant properties. In this research, hBN, MoS2 and graphite were used as filler coatings. The coating method used is slurry spray, which is a simple method and there is a subsequent sintering process so that the resistance of the coating to the substrate is better. The effect of the coating is seen before and after the sintering process on the surface and thickness. And to see the adhesion of the coating to the substrate, a thermal shock test was carried out. From the test results, it was found that sintering had a significant effect on the coating surface, where the defects on the coating surface became fewer and more even. The optimum temperature for sintering is 600oC where the least porosity is obtained

Physical and Mechanical Properties of Fiber Board from Corn Husk Fiber

Using agricultural waste materials, namely corn husk fiber (CHF), to reduce agricultural waste and recycle corn husk waste into sustainable engineering materials is relatively significant due to the decreasing number of woods. This study aims to analyze the effect of the volume fraction of CHF with polyester (PE) on the physical and mechanical strength of fiberboard composites with variations in volume fraction of 25% fiber : 75% PE, 50% fiber : 50% PE, and 75% fiber : 25% PE. Composites are made by the hand layup method. Fibers were pretreated by immersing 5% NaOH for 2 hours. The results of testing the physical properties of the highest density composite board at a volume fraction of 25% fiber : 75% PE of 0.85 g/cm³ and the lowest moisture absorption value was at 0.49%. The results of the mechanical board test in the form of the modulus of elasticity (MOE) test got the highest test value at the fiber volume fraction 25% fiber : 75% PE, which was 1179.2 MPa as well as the highest modulus of rupture (MOR) test value was found in the volume fraction 25% fiber: 75% PE that is equal to 9.4 MPa. Based on this result research, the average strength of the mechanical properties increases with the increase in the number of matrices. That indicates a reasonably good bond between the fiber and the matrix. The results of the water content test also increased as the density value increased.DOI: 10.17977/um024v7i22022p13

Preparation of synthesis nanoparticles Fe3O4 based on iron sand Sumbawa

Iron sand generally contains minerals such as ilmenite, magnetite, and hematite. Based on the results of previous tests, the main composition of iron sand in Rhee, Sumbawa regency, is magnetite. One method to increase the Fe content in iron sand is by pre-treatment with NaOH. NaOH is also used to precipitate heavy metals in a mineral. In this study, three variations were carried out with the ratio of NaOH: iron sand, namely: 1: 4, 2: 4, and 3: 4 at a temperature of 300 C. Furthermore, the calcination results were followed by the synthesis of Fe3O4 nanoparticles using the coprecipitation method. The results of the XRF characterization showed an increase in Fe levels after being processed by the alkalization treatment. The highest concentration was obtained in 1:4, with a Fe percentage of 91.1%. The results of the XRD characterization showed that the synthesis of Fe3O4 was successfully carried out with single phase Fe3O4 amlording to the data reference 96-9005839 forms and the space group F d -3 m. Crystal size analysis Using the Debey-Scherrer equation, the respective sizes were 12.7 nm, 8.71 nm, and 9.76 nm, respectively

THE EFFECT OF POWDER VOLUME ON WATER ABSORPTION TIME IN CORN COB (CORN COB) PARTICLE WITH EPOXY MATRIX

Serbuk tongkol jagung adalah limbah alam yang digunakan sebagai penguat pada komposit papan partikel. Limbah tongkol jagung sangat berlimpah di Kabupaten Sumbawa Besar, NTB. Pada umumnya tongkol jagung mengandung bahan selulosa murni yang dapat menjadi bahan pengisi alternatif karena sifat seratnya yang kuat (modulus tinggi). Antara rantai-rantai selulosa terdapat ikatan hidrogen yang kuat, sehingga menghasilkan struktur kristalin. Untuk menentukan sifat fisik terhadap limbah tongkol jagung dalam pemanfaatannya. Oleh karena itu limbah tongkol jagung dijadikan sebagai media komposit papan partikel. Serbuk tongkol jagung menggunakan ukuran partikel 70 Mesh dengan variasi volume 30%, 40%, 50%, 60%, 70%. Pembuatan komposit dilakukan dengan metode hand lay up dengan campuran resin epoxy dan hardener menggunakan standar pengujian SNI 03-2105-2006. Hasil yang diperoleh dari uji daya serap air menunjukkan bahwa semakin meningkat variasi volume yang digunakan pada komposit maka semakin tinggi daya serap air pada papan partikel dan semakin lama waktu perendaman yang digunakan makan semakin tinggi persentase yang didapatkan. Sedangkan hasil dari persentase berat terendah yaitu pada variasi volume partikel 30% dengan lama waktu 24 jam sebesar 1.4% dan persentase tertinggi yaitu pada variasi volume partikel 70% dengan lama waktu perendaman yaitu 72 jam sebesar 14.2%. Dari hasil penelitian yang dilakukan menunjukkan bahwa komposit serbuk tongkol jagung dengan resin epoxy pada variasi volume 30% yang lebih baik dibandingkan dengan variasi volume 70%.Corn cobs powder is natural waste used as reinforcement in particle board composites. Corn cobs waste is very abundant in Sumbawa Besar Regency, NTB. In general, corn cobs contain pure cellulose which can be an alternative filler because of its strong fiber (high modulus) properties. There are strong hydrogen bonds between the chains of cellulose, resulting in a crystalline structure. To determine the physical properties of corn cobs waste in its utilization. Therefore, corn cobs waste is used as a medium for particle board composite. Corn cobs powder uses a particle size of 70 Mesh with a volume variation of 30%, 40%, 50%, 60%, 70%. Composite production is done by hand lay up method with a mixture of epoxy resin and hardener using SNI 03-2105-2006 testing standards. The results obtained from the water absorption test show that the increasing the volume variation used in the composite, the higher the water absorption on the particle board and the longer the immersion time used, the higher the percentage obtained. While the results of the lowest weight percentage were the variation of the particle volume of 30% with a 24 hour duration of 1.4% and the highest percentage was the variation of 70% particle volume with a long soaking time of 72 hours of 14.2%. From the results of the research conducted showed that the composite corncob powder with epoxy resin at 30% volume variation was better than 70% volume variation

Analisis Variasi Temperatur Artificial aging Terhadap Struktur Mikro dan Sifat Mekanik Pada Aluminium 6061 T6

Penggunaan paduan aluminium seri 6061 dalam dunia industri sudah sangat banyak digunakan. Pemilihan bahan aluminium ini karena banyak memiliki keunggulan, tingkat keunggulan dari aluminium dapat dilihat dari sisi kemampuan permesinan yang baik, penyelesaian permukaan sempurna, tingkat ketahanan terhadap korosi yang baik dan kekuatan yang tinggi. Pada penelitian ini sampel menggunakan paduan aluminium seri 6061 dan dilakukan proses artificial aging dengan variasi temperatur 150ᴼC, 175ᴼC, 200ᴼC dan waktu tahan 8 jam. Lalu dilakukan pengujian kekerasan, uji impak, dan mikrostruktur. Hasil pengujian menunjukan bahwa sifat mekanik dari paduan setelah proses artificial aging cenderung menurun seiring bertambah variasi suhu, untuk nilai kekerasan yang didapat pada 150ᴼC sebesar 57,34 HRB, 175ᴼC sebesar 55,42 HRB, 200ᴼC sebesar 46,12 HRB. Untuk harga impak didapat harga optimal pada suhu 150ᴼC dengan nilai 41,4 J/mm2. Pada pengamatan mikrostruktur didapat senyawa yang terjadi hasil proses artificial aging pada setiap spesimen didapat senyawa AlMg2Si