Abstract
There are many methods to prevent the corrosion process. One of them is corrosion inhibitors usage. Inhibitor divided into two types, there are organic inhibitor and non-organic inhibitor. Organic inhibitor could be obtained by extracting some materials which exist in nature. In this research, bio-inhibitors were made from rambutan (Nephelium lappaceum) peel, banana (Musa acuminata Colla) peel, mango (Mangifera indica L.) leaves and papaya (Carica papaya)leaves. The determination of corrosion rate used weight loss method. The material of carbon steel ASTM A53 was used in the research. The salinity of artificial seawater was 35 ‰. The results showed that corrosion rate on carbon steel ASTM A53 was 0.2172 mpy at mango leaves and the efficiency of those inhibitor was 44.5%. The corrosion rate carbon steel ASTM A53 was 0.2436 mpy for corrosion rate and 37.8% of inhibitor efficiency when it used papaya leaves as bioinhibitor. Meanwhile, it reached 0.2739 mpy and 0.2812 mpy of corrosion rate for banana peel and rambutan peel, respectively. The efficiency of inhibitor were 30% and 28.2% for banana peel and rambutan peel, respectively. The corrosion rate on carbon steel ASTM A53 without inhibitor was 0.3914 mpy. Based on the microstructure results, all specimens in all variation of treatments showed pitting corrosion and uniform corrosion on specimen. In conclusion, mango leaves, papaya leaves, banana peel and rambutan peel have potentially to be used as bio-inhibitor to decrease the corrosion rate in marine environment.
Highlights
Corrosion can cause disastrous damage to metal and alloy structures causing economic consequences in terms of repair, replacement, product losses, safety, and environmental pollution
Some examples of natural materials that can be used as an organic inhibitor of banana peel, orange peel, dragon fruit peel, mangosteen peel, mango leaves, papaya leaves, and so forth
The aim of the research were to determine of corrosion rate and inhibitor efficiency of ASTM A53 steel after add with natural inhibitor from banana peel extract, rambutan peel, mango leaves, and papaya leaves
Summary
Corrosion can cause disastrous damage to metal and alloy structures causing economic consequences in terms of repair, replacement, product losses, safety, and environmental pollution. Due to these harmful effects, corrosion is an undesirable phenomenon that ought to be prevented [1].There are several steps to inhibit the process of corrosion, one of them is the inhibitors. Some examples of natural materials that can be used as an organic inhibitor of banana peel, orange peel, dragon fruit peel, mangosteen peel, mango leaves, papaya leaves, and so forth. The concentration of nature inhibitor obtained results that vary depending on the type of material used. They reduce the corrosion rate by (i) adsorption of ions/molecules onto metal surface, (ii) increasing or decreasing the anodic and/or cathodic reaction, (iii) decreasing the diffusion rate for reactants to the surface of the metal, (iv) decreasing the electrical resistance of the metal surface. (v) inhibitors that are often easy to apply and have in situ application advantage [3]
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