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Studi Eksperimen Pengaruh Variasi Inhibitor dan Konsentrasi Inhibitor terhadap Laju Korosi dan Penentuan Efisiensi Inhibisi pada Baja Tulangan Beton ST 42 di Kondisi Lingkungan Laut Bayu Mahardika; Herman Pratikno; Hasan Ikhwani
Jurnal Teknik ITS Vol 5, No 2 (2016)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Korosi pada logam adalah masalah yang tidak bisa dihindari, hanya bisa dihambat. Masalah ini harus diperhatikan secara khusus, karena bisa berdampak pada kerugian materi maupun kerugian teknis. Salah satu cara yang digunakan untuk menghambat korosi adalah dengan penambahan inhibitor. Seperti pada penelitian yang dilakukan pada tugas akhir ini, meneliti pengaruh variasi inhibitor dan konsentrasi inhibitor terhadap laju korosi dan penentuan efisiensi inhibisi pada baja tulangan beton ST 42 di kondisi lingkungan laut. Inhibitor yang akan digunakan adalah sodium nitrit, asam askorbat, dan asam karboksilat, dan variasi konsentrasi inhibitornya adalah 100 ppm, 200 ppm, dan 300 ppm. Larutan induk media korosif yang digunakan adalah larutan garam dengan salinitas 3,5 %. Data dari hasil eksperimen menunjukkan bahwa semakin tinggi konsentrasi inhibitornya maka semakin rendah laju korosinya, serta didapatkan kondisi optimal pengaruh variasi inhibitor dan konsentrasi inhibitor terhadap laju korosi pada baja tulangan ST 42 di kondisi lingkungan laut yang efisiensi inhibisinya tertinggi adalah baja tulangan beton ST 42 pada beton bertulang menggunakan inhibitor sodium nitirt dengan konsentrasi 300 ppm, yaitu sebesar 0,37665 %.

Studi Pengembangan Pulau Lumpur Sarinah Kabupaten Sidoarjo Sebagai Geo-Ecotourism Siti Chamdalah; Hasan Ikhwani; wahyudi wahyudi
Jurnal Teknik ITS Vol 5, No 2 (2016)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Daratan dengan total luas 94 hektar di kawasan muara Sungai Porong Kabupaten Sidoarjo yang dibentuk dari endapan buangan lumpur Sidoarjo disebut pulau lumpur buatan atau Pulau Sarinah. Secara administratif Pulau Sarinah masuk dalam wilayah Kecamatan Jabon, Kabupaten Sidoarjo, Provinsi Jawa Timur. Daratan buatan yang dibentuk sejak tahun 2011 ini ditumbuhi oleh tanaman bakau mayoritas jenis Api–api (Avicennia Officinalis). Terdapat pula sebuah kolam pendukung aktivitas penelitian dan kolam tempat pembudidayaan beberapa hewan air seperti udang, kepiting dan bandeng. Rencana pengembangan pulau menjadi kawasan ekowisata yang berkelanjutan mendapatkan beberapa kendala yaitu minimnya sarana prasarana pendukung ekowisata, ketidakjelasan status kawasan dan kepengurusan pulau sehingga pengembangan pulau tidak optimal. Maka dari itu, penelitian dengan metode Analisa Hirarki Proses (AHP) yaitu dengan menyatukan persepsi beberapa pihak terkait (pemerintah daerah dan pusat, masyarakat, BPLS serta akademisi) untuk mencapai rumusan pengembangan pulau berdasarkan prioritas kepentingan. Terdapat lima faktor yang diperhitungkan (lingkungan, ekonomi, sosial, hukum dan infrastruktur) dalam proses analisa dan dibantu dengan pengaplikasian software Expert Choice menunjukkan urutan prioritas pengembangan yang harus dilakukan yakni pengembangan destinasi (30,6%), pengembangan kelembagaan (28,3%), pengembangan pemasaran (24,8%) dan pengembangan industri (16,3%) dengan nilai rasio inkonsistensi sebesar 0.04.

Influence of Pre-Weld Heat Treatment and Aging Post-Weld Heat Treatment on Tensile Test and Microstructure of Aluminium 6061 Weld Joint Herman Pratikno; Tin Rachmatullah; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 1 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8701

Aluminium 6061 is an aluminium composition with Al-Mg-Si alloy which is often used for offshore structure material due to its high strength, good ductility and good corrosion resistance as well as its mechanical properties that can be enhanced by heat treatment. The purpose of this paper is to show the effect of heat treatment variations, in the form of preheating and aging PWHT, on tensile strength and microstructure of aluminium 6061 welding connection with GTAW process using electrode ER 5356. The pre-heat temperature variations used were 80°C, 100°C, and 120°C and the aging PWHT temperature variations used were 180°C and 260°c. The result shows that specimen with preheat treatment temperature of 120°C and aging pwht temperature of 260°C had the largest ultimate strength of 246.74 MPa and yield strength of 125.21 MPa. The highest percentage of Mg2Si formed was also found on the same specimen with a percentage of 48.84% in weld metal, 58.75% in HAZ, and 43.54% in base metal.

The Effect Analysis of Coating Thickness Variation and Mixture Composition of Magnesium – Flake Glass on Epoxy Coating on Abrasive Resistance, Adhesion Strength, and Prediction of Corrosion Rate of ASTM A36 Steel Plate Herman Pratikno; Yudiardana Tridantoko Susarno; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 2 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i2.9339

Steel cannot be separated from the marine manufacturing industry. It is important to control the corrosion rate of steel used for offshore structures. The coating method can be used in mobilization areas and splash zones that have high corrosion rates due to sustained friction loads in the marine environment. The purpose of this study was to analyze the different in adhesion strength, abrasion resistance, and corrosion rate prediction of ASTM A36 low carbon steel plate with coating thickness variations of 300µm, 500µm, and 700µm and Magnesium Carbonate - Flake Glass mixture variations of 10%, 20%, and 30%. In the pull-off test, the highest value of adhesion strength was obtained from specimen with 300µm coating thickness and 10% Magnesium Carbonate - Flake Glass mixture with a value of 5.67 Mpa. The highest abrasion test value was obtained from specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0.91 Wear Cyces per Micrometer. Whereas in the three cells electrode test, the highest value was found at specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0,00010 mmpy.

The Effect Analysis of Coating Thickness Variation and Mixture Composition of Magnesium – Flake Glass on Epoxy Coating on Abrasive Resistance, Adhesion Strength, and Prediction of Corrosion Rate of ASTM A36 Steel Plate Herman Pratikno; Yudiardana Tridantoko Susarno; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9956

Steel cannot be separated from the marine manufacturing industry. It is important to control the corrosion rate of steel used for offshore structures. The coating method can be used in mobilization areas and splash zones that have high corrosion rates due to sustained friction loads in the marine environment. The purpose of this study was to analyze the different in adhesion strength, abrasion resistance, and corrosion rate prediction of ASTM A36 low carbon steel plate with coating thickness variations of 300µm, 500µm, and 700µm and Magnesium Carbonate - Flake Glass mixture variations of 10%, 20%, and 30%. In the pull-off test, the highest value of adhesion strength was obtained from specimen with 300µm coating thickness and 10% Magnesium Carbonate - Flake Glass mixture with a value of 5.67 Mpa. The highest abrasion test value was obtained from specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0.91 Wear Cyces per Micrometer. Whereas in the three cells electrode test, the highest value was found at specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0,00010 mmpy.

Effect Analysis on Coating Methods and Corrosive Media Variations toward Adhesion Strength, Corrosion Rate, and Metallography of ASTM A36 Steel with Polyurethane Coating Herman Pratikno; Inaya Krista Pradyptia; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 2 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10933

Corrosion can cause material damage due to the material’s reaction with the environment. Corrosion will affect materials on construction, including metal material, thereby reducing the strength and the construction life, especially in a corrosive environment. The most effective and economical corrosion control is coating. The right coating application method will result in good bonding of the paint with the material, so that the corrosion protection will be better. This research used the ASTM A36 carbon steel material and polyurethane coatings. The purpose of this study is to determine the adhesion strength and corrosion rate by varying the application methods, namely brush, roll, and spray. In the pull-off test, the highest value of adhesion strength was obtained in the spray coating method with an average value of 20,82 MPa. Whereas in the three-electrode cell testing, the lowest corrosion rate using NaCl corrosive media was found in the spray coating method with a value of 0.000025402 mmpy and the lowest corrosion rate using FeCl3 corrosive media was found in the spray coating method with a value of 0.00182 mmpy.

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