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Gyani Ubaydillah
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Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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PENGARUH DAUN JAMBU BIJI SEBAGAI INHIBITOR KOROSI ALAMI RANTAI KAPAL Nani Mulyaningsih; Sigit Mujiarto; Gyani Ubaydillah
Journal of Mechanical Engineering Vol 3, No 1 (2019): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v3i1.1523

Abstract

Corrosion is the interaction of metals with their environment which results in damage to metals. Corrosion can also occur in the chain of vessels that are usually located on the side of the ship's hull and are directly exposed to sea water. If it is not properly observed, the condition will damage and reduce the life of the ship chain. It is necessary to add inhibitors as substances to inhibit the corrosion rate. Inhibitors that are generally used are inhibitors that have toxic properties to the environment, therefore it is necessary to use organic inhibitors that do not damage the environment. The purpose of this study was to determine the effect of inhibitors of guava leaf extract on the corrosion rate of ship chains. This research was conducted by immersing specimens with concentrations of 6%, 9%, 12%, and  immersion time of 1 hour. Corrosion rate is calculated using the dynamic potentiary polarization method. After calculating the corrosion rate, the inhibitor efficiency is calculated. After immersion is obtained, the inhibitor has an influence. This was shown after the corrosion test found that at a concentration of 9% inhibitors of guava leaf extract was able to reduce the corrosion rate of 0.066 mpy and has the highest efficiency value of 97.3%.
PEMANFAATAN TEH SEBAGAI BIOINHIBITOR KOROSI PEGAS DAUN Nani Mulyaningsih; Sigit Mujiarto; Gyani Ubaydillah
Journal of Mechanical Engineering Vol 2, No 2 (2018): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v2i2.1436

Abstract

Leaf springs, especially in cars, are one of the metal components that must get attention because their location under the vehicle causes susceptibility to corrosion due to environmental conditions. Corrosion is an absolute phenomenon that occurs in metals, but corrosion can be controlled by speed with certain techniques. One of them is the use of environmentally friendly corrosion inhibitors (bioinhibitors). Tea is known to have high antioxidant compounds, but its use is only limited as a drink ingredient. Starting from these problems, a study was conducted on the use of tea as a bioinhibitor in leaf pegs. This study use variations in inhibitor concentration (15%, 20%, 25%). To determine the corrosion rate a corrosion test was carried out. The test results showed that tea proved to be able to reduce the highest corrosion rate at concentration  25% in the amount of .37%. Corrosion rate before being given an inhibitor of 3.8195 mm / y and after being given inibitor decreased to 3.4614 mm / y.
Co-Authors Nani dkk. Mulyaningsih Sigit Mujiarto