Inhibiting Effect of Ciprofloxacin, Norfloxacin and Ofloxacin on Corrosion of Mild Steel in Hydrochloric Acid

Electrochemical and quantum chemical parameters of (-)-(S)-9-flu¬oro-2,3-dihydro-3-methyl-10-(4-methyl-1-pipera-zinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acidas anti-corrosive agent for API 5L X-52 steel

“…Thus, some non-or low-toxic alternatives must be developed to replace traditional hazardous inhibitors. In recent years, some pharmaceutical drugs were recommended for such a purpose such as azithromycin [2], amoxicillin [3], cefixime [4], ciprofloxacin [5], amlodipine [6], oxytetracycline [7], doxycycline [8], norfloxacin [9], enrofloxacin [10], amifloxacin [11], pefloxacin [12], penicillin V [13], ampicillin [14], cloxacillin [15] and flucloxacillin [16]. All these pharmaceutical compounds are rich in heteroatoms like nitrogen, sulphur and oxygen,  bonds and/or aromatic rings, which are major adsorption centres in good corrosion inhibitors.…”

Corrosion inhibition of carboxylate inhibitors with different alkylene chain lengths on carbon steel in an alkaline solution

“…The rst largest peak is attributed to the C-C and C-H aliphatic bonds with binding energy of 284.8 AE 0.02 eV, 50,51 the second is attributed to the C]C bonds with a binding energy of 286 AE 0.25 eV, 52 and the third peak may be assigned to the carbon atom of the C-O and C]O bonds in carboxylate radical with binding energy of 288.3 AE 0.15 eV. 51,52 The C 1s spectrum consists with the carboxylate chemical structure and conrms the adsorption of inhibitors. The C]C bonds of C18 shis to negative, indicating that the C]C bonds Fig.…”

“…7 The relationship between q/(1 À q) and C inh . 51,52 The peaks at 531.1 eV of C]O and 532.3 eV of -C-O group show that the inhibitor adsorbed on the steel surface via the -COO À group. 22 The last peak at 535.8 eV might be attributed to oxygen in the adsorbed water.…”

Comparative study of Levofloxacin and its amide derivative as efficient water soluble inhibitors for mild steel corrosion in hydrochloric acid solution

“…Corrosion inhibition studies of many drugs, such as blactam antibiotics {penicillin G [7], ampicillin [8], amoxicillin [9]}, quinolones {ofloxacin [10], ciprofloxacin [11], quinoline [12]}, tetracyclines {doxycycline [13]}, sulphonamides {sulfamethazine [14], dapsone [15] antifungal {ketoconazole [16]}, antiviral {rhodanine [17]}, have been reported.…”