Abstract
Alkaline corrosion is one of the main issues faced by the industries. The main chemicals abundantly used in industries are NaOH, H3PO4, HCl, and H2SO4. Corrosion control of metals has technical, economical, environmental, and aesthetical importance. The use of inhibitors is one of the best options to protect metals and alloys against corrosion. The corrosion protection of mild steel in 1 M NaOH solution by mix of Henna/Zeolite powder was studied at different temperatures by weight loss technique. Adsorption, activation, and statistical studies were addressed in this work. Adsorption studies showed that inhibitor adsorbed on metal surface according to Langmuir isotherm. Surface studies were performed by using UV-spectra and SEM. The adsorption of inhibitor on the steel surface was found to obey Langmuir’s adsorption isotherm. The inhibition efficiency increased with increasing concentration of the inhibitor in NaOH medium. Inhibition mechanism is deduced from the concentration and temperature dependence of the inhibition efficiency, Langmuir’s adsorption isotherm, SEM, and UV spectroscopic results.
Highlights
Corrosion is the deterioration of metal by chemical attack or reaction with its environment
The corrosion of mild steel in 1 M NaOH solution containing various concentrations of inhibitor at different temperatures was studied by weight loss measurements
Henna/Zeolite powder mix acts as a green corrosion inhibitor of mild steel with maximum inhibition efficiency of 95.97% at 30∘C and maximum level of inhibitor concentration
Summary
Corrosion is the deterioration of metal by chemical attack or reaction with its environment. Organic compounds act as good inhibitors due to their heteroatom structures such as sulfur, nitrogen, and oxygen [1] By using these organic molecules on metal-solution interface, four types of adsorption may take place: (a) electrostatic attraction between the charged molecules and charged metal, (b) interaction of uncharged electron pairs in the molecule with metal, (c) interaction of p-electrons with metal, and (d) combination of (a) and (c). Research works are going on for investigating the inhibitive properties of plant extracts Inhibitors in this class are those that are environmentally friendly and are obtained from natural products such as plant extracts [3]. Several studies have been carried out on the inhibition of corrosion of metals by plant extract, essential oils, or purified compounds
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