Rajagukguk, Redemptus (2017) Pengaruh Bakteri Azotobacter, Bacillus Subtilis, Dan Pseudomonas Putida Terhadap Laju Korosi Alumunium 6063. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Korosi merupakan suatu fenomena yang dialami oleh logam yang tidak mungkin dihindari. Proses korosi terjadi secara fisis, khemis, maupun biologis. Korosi biologis umumnya disebabkan oleh adanya mikroorganisme salah satu contohnya yaitu bakteri. Penelitian dilakukan dengan menggunakan metode Immersion Test. Material yang diuji adalah Alumunium, logam lunak dan ringan yangjuga memiliki warna keperakan kusam karena lapisan tipis oksidasi yang terbentuk saat unsur ini terkena udara. Alumunium yang digunakan adalah alumunium 6063 yang dikembangkan dengan begitu pesat dan dapat diolah menjadi berbagai macam produk yang lebih ekonomis. Larutan menggunakan media air lautpengganti yang dibuat sesuai dengan standar ASTM D1141-98 (reapproved 2003), pada tiap material uji dalam 3 kondisi lingkungan laut, yaitu lingkungan laut dalam (salinitas 33‰), lingkungan laut sedang (salinitas 35‰), dan lingkungan laut dangkal (salinitas 37‰), yang kemudian ditambahkan 3 jenis bakteri, yaitu: Azotobacter, Bacillus subtilis, dan Pseudomonas putida. Bakteri dikembangbiakkan didalam media NA (Nutrient Agar) selama 24 jam di dalam incubator, setelah itu dipindahkan ke dalam media NB (Nutrient Broth) dan di Shaker selama 6 jam. Material dimasukkan ke dalam media air laut buatan yang telah berisi bakteri dengan seluruh permukaan material berada di bawah air. Sehingga didapatkan Laju korosi untuk bakteri Azotobacter adalah: Salinitas 33‰ memiliki laju korosi 0.0443 mmpy, Salinitas 35‰ memiliki laju korosi 0.0470 mmpy, dan Salinitas 37‰ memiliki laju korosi 0.0554 mmpy. Laju korosi untuk bakteri Bacillus subtillis adalah: Salinitas 33‰ memiliki laju korosi 0.0215 mmpy, Salinitas 35‰ memiliki laju korosi 0.0301 mmpy, dan Salinitas 37‰ memiliki laju korosi 0.0329 mmpy. Laju korosi untuk bakteri Pseudomons putida adalah: Salinitas 33‰ memiliki laju korosi 0.0155 mmpy, Salinitas 35‰ memiliki laju korosi 0.0156 mmpy, dan Salinitas 37‰ memiliki laju korosi 0.0194 mmpy.
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Corrosion is a phenomenon experienced by metals that cannot be avoided. The corrosion process occurs physically, chemically, and biologically. Biological
corrosion is generally caused by the presence of microorganisms, for example, bacteria. The research was conducted by using Immersion Test method. The material tested is Aluminum, a soft and light metal and also has a dull silvery color due to the thin layer of oxidation formed when this element is exposed to
air. Aluminum used is aluminum 6063 which is developed so rapidly and can be processed into various pro
ducts with more economical value. Solution using
substituted seawater media prepared in accordance with ASTM D1141-98 (reapproved 2003) standard, on each test material in 3 marine environment
conditions, namely deep ocean environment (salinity 33 ‰), medium marine environment (salinity 35 ‰), and Shallow marine environment (salinity 37 ‰), which then added 3 types of bacteria, namely: Azotobacter, Bacillus subtilis, and Pseudomonas putida. The bacteria were bred in NA medium (Nutrient Agar) for 24 hours in the incubator, then transferred into NB (Nutrient Broth) media and placed on Shaker for 6 hours. The material is inserted into an artificial marine
water medium containing bacteria with the entire surface of the material
underwater. The corrosion rate for Azotobacter
bacteria are : Salinity 33 ‰ has a
corrosion rate of 0.0443 mmpy, Salinity 35
‰ has a corrosion rate of 0.047 mmpy, and Salinity 37 ‰ has a corrosion rate of 0.0554 mmpy. The corrosion rate for Bacillus subtillis bacteria are : Salinity 33 ‰ has
a corrosion rate of 0.0215 mmpy, Salinity 35 ‰ has a corrosion rate of 0.0301 mmpy, and Salinity 37 ‰ has a corrosion rate of 0.0329 mmpy. The corrosion rate for Pseudomons putida bacteria are : Salinity 33 ‰ has a corrosion rate of 0.0155 mmpy, Salinity 35 ‰ has a corrosion rate of 0.0156 mmpy, and Salinity 37 ‰ has a corrosion rate of 0.0194 mmpy.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Laju Korosi, Immersion Test, Alumunium, Bakteri, Salinitas, Corrosion Rate, Bactheria, Salinity |
| Subjects: | Q Science > QR Microbiology T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Redemptus Rajagukguk . |
| Date Deposited: | 23 Oct 2017 07:58 |
| Last Modified: | 05 Mar 2019 08:28 |
| URI: | http://repository.its.ac.id/id/eprint/47774 |
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