′-((2-methoxy-naphthalene-1-yl)methylene) pyrimidine-5-carbohydrazide (H5) and

4 Conclusions

The results from all experiments demonstrated that the percentage of inhibition for carbon steel corrosion rises with increasing the (H4 & H5 & H6) concentrations, the percentage of inhibition is also increasing with increasing temperatures. The adsorption of compounds molecules on the carbon steel surface is due to Temkin isotherm. Tafel polarization results demonstrate that (H4 & H5 & H6) appears as mixed type inhibitor. The inhibition efficiencies examined by different techniques are in acceptable agreement. The FT-IR and XPS examination assured the foundation of a protective layer of (H4 & H5 & H6) on carbon steel surface. The investigated compounds which have shown inhibition efficiency greater than 90% are the most suitable inhibitors for any industrial application as corrosion inhibitors of carbon steel. The investigation by Monte Carlo Simulation substantiates the experimental results. The inhibition efficiency can be arranged in the following order H6 > H4 > H5.

Funding

This study did not obtain any external funding.

Conflicts of interest

There are no conflicts to declare.

Acknowledgements

Many thanks to Dr/Hala Refaat (professor of organic chemistry-faculty of science-El-Arish University) for synthesizing & providing the investigated compounds.

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