Study of the corrosion products formed on carbon steel surface in hydrochloric acid solution

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution. Electrochemical and AFM Investigation

“…Thus, for trimethoprim [2], quinine sulfate [4], aminophylline [5], sulfacetamide [6], sulfathiazole [7,8], the inhibition efficiency (IE) reached values between 80.0% and 93.0%, depending on their concentrations in studied environment. The XPS can accurately reveal the metal surface layer composition, both in the absence and presence of the inhibitor.…”

“…The organic compounds act by adsorption on surface, forming protective layers with inhibitory properties against metal oxidation. The molecules of organic compounds contain oxygen, nitrogen and sulfur heteroatoms with high adsorption affinity on the metallic surfaces [1][2][3][4][5][6][7][8]. Thus, organic substances act by physical or chemical adsorption on the metal surface involving electrostatic interactions, physical or chemical bonds between unshared electron pairs of the heteroatoms and the dvacant orbital of some metal atoms from surface [2][3][4][5][6].…”

“…Many types of compounds [2][3][4][5][6][7][8][9][10][11][12][13] such as drugs [2][3][4][5][6][7][8][9], plant extracts [10,13] and polymers [11,12] have been reported as efficient corrosion inhibitors that can contribute to the formation of protective layers on the carbon steel/stainless steel surfaces. The use of expired drugs in other activity fields could lead to the reduction of their disposal/destroying costs.…”

“…The use of expired drugs in other activity fields could lead to the reduction of their disposal/destroying costs. A proper way is their reintegration into the chemical industry, as "Green Corrosion Inhibitors" for metallic materials [4-9, 14,15], being less toxic than others, having aqueous solubility and adsorption affinity for the metal surface and/or the capacity to form complexes with the metal ions released in solution during corrosion processes [4][5][6][7][8].…”

“…The weight loss method and electrochemical measurements coupled with different techniques such as scanning electron microscopy, X-ray photoelectron spectroscopy, UVVis spectrophotometry, high performance liquid chromatography and thermal analysis, have been used [2,[4][5][6][7][8] to evaluate the inhibitory performance of some drugs for carbon steel corrosion in hydrochloric acid solution. Thus, for trimethoprim [2], quinine sulfate [4], aminophylline [5], sulfacetamide [6], sulfathiazole [7,8], the inhibition efficiency (IE) reached values between 80.0% and 93.0%, depending on their concentrations in studied environment.…”