Pengaruh Cacat Coating Dan Perbedaan Salinitas Terhadap Laju Korosi Pada Daerah Splash Zone Menggunakan Material Baja A 36

Ardianto, Pieter (2017) Pengaruh Cacat Coating Dan Perbedaan Salinitas Terhadap Laju Korosi Pada Daerah Splash Zone Menggunakan Material Baja A 36. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi pada daerah splash zone mempunyai laju korosi yang sangat tinggi. Sehingga perlu barier/coating yang sangat baik untuk menjadi pelindung dari material. Namun teknik coating tidak lepas dari berbagai masalah yang 80% disebabkan karena surface preparation. Buruknya saat proses surface preparation makin membuat daerah splash zone menjadi daerah paling korosif bagi materil. Korosi sendiri merupakan hasil kerusakan material melalui suatu reaksi kimia atau elektrokimia secara spontan yang menyebabkan penurunan mutu pada material. Pada anjungan lepas pantai sering di jumpai cacat akibat tertabrak dengan kapal yang bersandar maupun saat peluncuran jacket. Cacat yang terjadi mengakibatkan rusaknya lapisan coating yang berfungsi sebagai barrier atau pelindung agar material tidak cepat terkorosi. Sehinga perlu diadakannya sebuah penelitian Pengaruh Cacat coating dan salinitas pada daerah splash zone. Penelitian ini merupakan eksperimen dengan mengunakan material uji ASTM 36 dimana material ini sering digunakan sebagai kaki jacket. Material akan di dipersiapkan terlebih dahulu dengan material abrasif berjenis Steel Grid dan dilanjutkan dengan proses coating, kemudian di lakukan pencacatan. Setelah itu di lakukan pengujian salt spray dengan salinitas 40‰, 50‰, dan 60‰. Dari penelitian ini di hasilkan bahwa kekasaran material akibat material abrasif yang di lakukan pada proses blasting mempengaruhi ketebalan coating yang melekat pada material. Nilai kekasaran yang tertingi yaitu 116 µm dengan ketebalan coating 352,3 µm. Hasil dari pengujian salt spray menunjukan bahwa coating tanpa cacat mempunyai laju korosi yang sangat rendah di semua salinitas dengan kategori outstanding. Laju korosi coating tanpa cacat dengan salinitas 40‰, 50‰, dan 60‰ berturut-turut 0,022 mpy, 0,064 mpy, dan 0,136 mpy. Hasil dari pengujian salt spray, laju korosi coating dengan cacat gores satu pada salinitas 40‰, 50‰, dan 60‰ berturut-turut adalah 30,381 mpy, 48,167 mpy, dan 77, 434 mpy. Dari pengujian salt spray, laju korosi coating dengan cacat gores dua pada salinitas 40‰, 50‰, dan 60‰ berturut-turut 44,320 mpy, 75,407 mpy, dan 105,012 mpy. ============================================================ Corrosion in the splash zone area has a very high corrosion rate. So it needs barrier / coating that is very good to be the protector of the material. But the coating technique is not free from the problems, that 80% due to surface preparation. Poor surface preparation process more time making a splash zone area become the most corrosive areas for the material. Corrosion itself is the result of material damage through a spontaneous chemical or electrochemical reaction that causes a decrease in the quality of the material. On offshore platforms are often encountered in defects due to being hit by a leaning ship or during jacket launch. Defects that occur resulting in damage to the coating layer that serves as a barrieror a protective order is not quickly corroded material. So that needs to be holding a research Influence of Defects coating and salinity in the splash zone area. This research is an experiment using ASTM 36 test material where this material is often used as foot jacket. Material will be prepared in advance with abrasive material manifold Steel Grid and continued with the coating process, then do mutilations. After the salt spray test done with a salinity of 40 ‰, 50 ‰, and 60 ‰. From this research produced material that roughness due to the abrasive material will be undertaken on the blasting process affects the thickness of the coating that is attached to the material. The highest roughness value is 116 μm with coating thickness 352,3 μm. The results of the salt spray test showed that the coating without disabilities have very low corrosion rate in all salinity with outstanding category. The rate of corrosion coating without defect with salinity 40 ‰, 50 ‰, and 60 ‰ were 0.022 mpy, 0.064 mpy, and 0.136 mpy respectively. The results of the salt spray test, the corrosion rate of coatings with one scratch defect at salinity 40 ‰, 50 ‰, and 60 ‰ were 30,381 mpy, 48,167 mpy, and 77,442 mpy respectively. From salt spray testing, the corrosion rate of coatings with two scratch defects in salinity 40 ‰, 50 ‰, and 60 ‰ were 44,320 mpy, 75,407 mpy, and 105,012 mpy, respectively.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Corrosion rate, Splash Zone, Disability Coating, Salinity.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
V Naval Science > V Naval Science (General)
V Naval Science > VC Naval Maintenance
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Pieter Ardianto
Date Deposited: 19 Oct 2017 06:11
Last Modified: 19 Oct 2017 06:11
URI: https://repository.its.ac.id/id/eprint/45655

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