Abstract
The effect of cantaloupe juice and seed extracts on corrosion of cast iron in 1.0 M hydrochloric acid (HCl) solution using hydrogen evolution measurements (HEM) and mass loss measurements (MLM) were investigated. Cantaloupe extracts inhibited the corrosion of cast iron in 1.0 M HCl solution. The inhibition efficiency increased with concentration of the extracts. The adsorption of the inhibitor molecules on cast iron surface was in accordance to Langmuir adsorption isotherms. In absence of inhibitors, the corrosion rate of cast iron increases with HCl concentration. The fractional reaction order observed in HCl solution indicates the formation of intermediates through the dissolution process or multiple steps mechanism of cast iron dissolution in HCl solution. Key words: Cantaloupe (Cucumis melo), corrosion, cast iron, HCl concentrations, adsorption isotherm.
Highlights
The use of inhibitors is one of the best options of protecting metals against corrosion, especially green or eco-friendly inhibitors
The C.R. of cast iron increase with increasing acid concentration, this indicates that cast iron corrosion in hydrochloric acid (HCl) is concentration dependent
Inhibition action of cantaloupe extracts as green inhibitor in cast iron corrosion The corrosion rates for cast iron in 1.0 M HCl in absence and presence of cantaloupe extracts were determined by using hydrogen evolution measurements (HEM) and mass loss measurements (MLM)
Summary
The use of inhibitors is one of the best options of protecting metals against corrosion, especially green or eco-friendly inhibitors. Comparisons have been made through the years between the toxic inorganic inhibitors such as; chromates, pomegranate, and cyanide, or synthetic organic compounds and the natural inhibitors, it observed that the natural inhibitors could potentially serve as an effective substitute for the corrosion inhibitors without constituting risk for human health or the environment in which people live in (Shanableh, 2011). Many of these natural inhibitor substances can be extracted from different parts of plants: seed, fruit and leaves. For being that it can be extracted by simple procedures, which can keep the environment healthier with low cost and can be applied in various aggressive environments that make it a major importance in research
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