Abstract
A tin-containing metallic complex derived from Curcuma longa, bis[1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dionato-κO,κO′]bis(butyl), has been obtained and used as a green corrosion inhibitor for carbon steel in 0.5 M sulfuric acid by using weight loss, electrochemical techniques, and the Density Functional Theory. It was found that the obtained metallic complex greatly decreases the steel corrosion rate by adsorption according to a Frumkin model in a weak, physical type of adsorption. Inhibitor efficiency increased with its concentration, and it acted as a mixed type of inhibitor. Results were supported by quantum-chemical research in order to examine the relationship between structural and electronic properties and the inhibitor efficiency.
Highlights
The use of organic inhibitors, those which contain oxygen, nitrogen, sulfur, or carbon, is one of the most commonly used methods to combat the corrosion of metals, which causes huge economic loses and severe accidents in the industry [1,2,3,4,5,6]
The absorption peaks for the carbonyl groups present in the curcumin are shown at 1601 and 1625 cm-1, while these groups were shifted towards lower wave numbers (1588 and 1617 cm-1) for the metallic complex
The presence of the capacitive loop at high frequency values indicates that the corrosion of carbon steel in sulfuric acid is mainly controlled by the charge transfer and the formation of a protective film on the steel surface
Summary
The use of organic inhibitors, those which contain oxygen, nitrogen, sulfur, or carbon, is one of the most commonly used methods to combat the corrosion of metals, which causes huge economic loses and severe accidents in the industry [1,2,3,4,5,6]. This is because compounds with π-bonds generally exhibit good inhibitive properties due to their interaction with the metal surface [7,8,9]. Due to the potent antioxidants contained in Curcuma longa, it is used in folk Indian
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