Journal of Basic and Environmental Sciences

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Abstract of:



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The inhibitive effect of 4-((4-formyl-3-hydroxyphenyl)diazenyl)-3-hydroxynaphthalene-1-sulfonic acid on carbon steel corrosion in hydrochloric acid solution was investigated using chemical and electrochemical techniques. It was found that the compound acts as good corrosion inhibitor with inhibition efficiency more than 98.5%. The inhibition efficiency was found to increase with inhibitor concentration and exposure time. On the other hand, it decreases by rising the temperature. The inhibition action was discussed in view of adsorption of the organic compound molecules on the carbon steel surface. It was found that the adsorption of 4-((4-formyl-3-hydroxyphenyl)diazenyl)-3-hydroxynaphthalene-1-sulfonic acid on carbon steel surface follows Langmuir adsorption isotherm. The thermodynamic parameters for the corrosion process in free and inhibited media were calculated and interpreted. Corrosion of metals and alloys is a disaster which causes a large economic loss in different human activities. The corrosion process is thermodynamically spontaneous and cannot be totally stopped anyhow. However, there are continuous trials to develop methods for decreasing the corrosion to its minimum rate. One of the methods used to achieve this goal was using inhibitors. The corrosion inhibitors act either by adsorption on the metal surface or reaction with it producing a passive film. The former ones are most likely organic compounds (Azo compounds) with atoms in their structures carrying lone pair of electrons capable of electrostatic attraction of the vacant orbitals of the metal


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