Abstract
In this study, Cocor Bebek leaves (Kalanchoe pinnata) extract is studied for metal corrosion inhibitor. 10.3 kg of K. Pinnata leaves produce concentrated extract of methanol, n-hexane and ethyl acetate as much as 65.7442, 36.1452, and 15.2711 g respectively. The concentrated extracts were then used to determine the rate of corrosion. Corrosion rate test showed that extract of ethyl acetate can reduce corrosion rate of carbon steel in NaCl 3.5% from 2.954 mpy to 0.963 and 0.923 mpy using 500 ppm and 1000 ppm of extract consecutively. Corrosion rate of Cocor Bebek extract at addition of 500 ppm ethyl acetate in the solution of NaCl 3.5% is decreasing immediately. It was found that the carbon steel corrosion rate decrease as much 4.857 for 6 hours and continuously shows sharp decline until 24 hours of corrosion time. Corrosion rate is slowly decreasing till reach 1.694 mpy at corrosion time of 168 hours.
Highlights
Corrosion is a material deterioration due to electrochemical processes between metal and its environment which involve electron transfer from anode to cathode (Jones, 1992)
The effectivity of organic inhibitor from Cocor Bebek leaves in decreasing metal corrosion rate is studied in this research
This research uses true experimental methods which consist of leaves collection, maceration using methanol (MeOH), evaporation, fractionation using n-hexane and ethyl acetate (EA) eluents to produce concentrated extract from those three fractions
Summary
Corrosion is a material deterioration due to electrochemical processes between metal and its environment which involve electron transfer from anode to cathode (Jones, 1992). Corrosion inhibitor come from organic and inorganic compounds containing pair of free electron such as nitrite, chromate, phosphate, urea, phenylalanine, imidazoline and any other amine compounds. This synthetic chemical is hazardous to both living creatures and environments, and expensive from the economical perspective. Cocor Bebek (Kalanchoe pinnata) is one of commonly used plant as a research material. This plat is popularly used as traditional medicine and ornamental plant. The effectivity of organic inhibitor from Cocor Bebek leaves in decreasing metal corrosion rate is studied in this research
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