In this work, economy novel hydrazine-derived coumarin 4-(6-methylcoumarin)acetohydrazide (MCA) were synthesized, characterized, and tested as an inhibitor for the corrosion of a surface of mild steel in an acidic environment through weight loss and Scanning electron microscopy (SEM) techniques. Results showed that the synthesized inhibitor can inhibit the corrosion of mild steel surface in a 1 M hydrochloric acid environment. The corrosion inhibition efficiency of MCA increases with increasing MCA concentration and decreases with increasing temperature. SEM analysis showed the formation of a film as a protective layer from MCA molecules on the surface of mild steel. Adsorption of the MCA molecules on the mild steel surface in the presence of hydrochloric acid environment was obeyed Langmuir isotherm. The density functional theory (DFT) calculations were used to study the relationship between molecular structure and inhibition efficiency and they found in good agreement.
New coumarin namely 2-(3-(7-methylcoumarin)acetamido)benzoic acid (MAB) was successfully synthesized by reaction of ethyl 2-(7-methylcoumarin)acetate with anthranilic acid. The chemical structure of MAB was confirmed by FT-IR, NMR spectroscopies and Elemental Analysis. The inhibition performance of MAB was investigated using the weight loss method. The results illustrate the strong adsorption of MAB molecules on the mild steel coupon surface and this adsorption follows the Langmuir adsorption isotherm. DFT calculations were performed to show the relationship between the MAP molecular structure and inhibition performance.
In this practical study, the thermal conductivity and compressive strength of a number of cement mortar and sawdust mixtures were measured. This study aims to analyze the possibility of using these mixtures as thermal insulators in the building parts. The materials used in the study were ordinary Portland cement available in the local Iraqi market, sand, and sawdust. Samples were prepared according to American standards. Sawdust in two different sizes (greater than 50 mm and less than 1.4 mm) was added to the cement. The study results showed that adding sawdust caused an apparent decrease in the mixture’s thermal conductivity, which means an improvement in the thermal insulation of the mixtures. The decrease in conductivity also raised with the sawdust mass fraction increase. The thermal conductivity of sawdust and cement mixtures increased when using small sawdust (less than 1.4 mm) compared to the second case (sawdust of large size above 5 mm). The mixture’s thermal conductivity decreased with the increase in the water curing period, and the decrease in conductivity increased with this period. Increasing the sawdust mass fraction resulted in a decrease in the studied mixtures’ compressive strength, and this resistance decreased more when using sawdust of smaller sizes (less than 1.4 mm). The compressibility strength of all the studied products increases with the increase in the treatment time with water due to the cement’s properties.
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