Abstract
Green inhibitors are promising alternatives to toxic corrosion inhibitors as they are environmentally safe substances, ecologically acceptable and renewable. In this research, the effect of green henna as an inhibitor existing in the coating of TMSM-PMMA and its electrochemical study were analyzed. The coating was produced by “sol-gel” method in order to protect the corrosion of low-carbon steel. TMSM hybrid cell was synthesized by hydrolysis and condensation, Metaacryloxypropyltrimethoxysilane and Tetraetylorthosilicate with 1:1 molar ratio and PMMA hybrid cell was produced by Methylmetaacrylate polymerization. Finally two cells were mixed in 1:1 weight ratio. The carbon steel substrates were prepared by dip coating method. SEM technique was applied for the microstructure evaluation of thin layers including different concentrations of henna extract. Adhesion of coating was analyzed by “Pull off” test. Additionally, the experimental results obtained in different concentrations of henna extract using electrochemical methods such as tafel polarization, electrochemical impedance spectroscopy indicating that coating with the concentration of 3% inhibitor had a high level of inhibition efficiency in 0.1 M HCL. The results of polarization tests signified that henna extract acts as a mixed inhibitor.
Highlights
Carbon steels play an important role in industrial environment because of their good mechanical and physical properties as well as low cost [1]
The experimental results obtained in different concentrations of henna extract using electrochemical methods such as tafel polarization, electrochemical impedance spectroscopy indicating that coating with the concentration of 3% inhibitor had a high level of inhibition efficiency in 0.1 M HCL
In the 0.1 M HCL solution were carried out and the results were compared with the polarization results of the condition in which henna extract of the concentrations 1%, 3%, 6%, 9% were added to the hybrid coating
Summary
Carbon steels play an important role in industrial environment because of their good mechanical and physical properties as well as low cost [1]. Coatings prevent exchanging electrons in electrochemical reaction Because of this mechanism, a protective layer is formed between the substrate and the aggressive medium [2]. One of the appropriate ways for the surface protection of some materials could be by the use of hybrid organic-inorganic sol-gels which are considered as suitable option for this purpose [4]. The mechanism of inhibition is through inhibitor incorporation in the film, moving and precipitating This procedure results in the constitution of passivating effect while a defect has emanated. Polymeric mixture forming from the existing of PMMA results in improving the properties of organic-inorganic hybrid coating. The classification of these materials is based on their chemical bond characteristics, they are classified into two general categories. The efficiency of protective coatings in the presence and absence of inhibitors was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
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