Abstract
The inhibition effect of morpholine on the corrosion of mild steel in 2N sulphuric acid and phosphoric acid has been studied by mass loss and polarization techniques between 302K and 333K. The inhibition efficiency increased with increase in concentration. The corrosion rate increased with increase in temperature and decreased with increase in concentration of inhibitor compared to blank. The adsorption of inhibitor on the mild steel surface has been found to obey Temkin's adsorption isotherm. Potentiostatic polarization results reveal that morpholine act as mixed type inhibitor. The values of activation energy (Ea), free energy of adsorption (∆Gads), enthalpy of adsorption (∆H), and entropy of adsorption (∆S) were also calculated.
Highlights
Phosphoric acid is a major chemical product, which has many important uses, especially in the production of fertilizers
The inhibition efficiency increased with increase in concentration of inhibitors and decreased with temperature from 313 K to 333 K in 2N phosphoric acid .The values of the corrosion rate and inhibition efficiency of the inhibitors are known to depend on the molecular structure of the inhibitors
Corrosion rates of mild steel in 2N sulphuric acid and 2N phosphoric acid decreased with increasing concentration of Morpholine
Summary
Phosphoric acid is a major chemical product, which has many important uses, especially in the production of fertilizers. Nickel–base alloys and stainless steel are frequently used in many parts of the wet process and a considerable quantity of data has been published about the resistance of these materials to corrosion by phosphoric acid solution [1,2,3,4]. Most of the previous studies were focused on the inhibition of stainless steel or chromium-nickel steel in hydrochloric acid or sulphuric acid solutions using organic compounds containing nitrogen, sulphur and oxygen atoms as corrosion inhibitors[5, 6]. There is wide consideration in the literature regarding corrosion inhibition studies by nitrogen containing heterocyclies [7,8,9,10]. Heterocyclic compounds containing nitrogen and sulphur atoms are of particular
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