title: Corrosion inhibitors from expired drugs.
abstract: This paper presents a method of expired or unused drugs valorization as corrosion inhibitors for metals in various media. Cyclic voltammograms were drawn on platinum in order to assess the stability of pharmaceutically active substances from drugs at the metal-corrosive environment interface. Tafel slope method was used to determine corrosion rates of steel in the absence and presence of inhibitors. Expired Carbamazepine and Paracetamol tablets were used to obtain corrosion inhibitors. For the former, the corrosion inhibition of carbon steel in 0.1 mol L(-1) sulfuric acid solution was about 90%, whereas for the latter, the corrosion inhibition efficiency of the same material in the 0.25 mol L(-1) acetic acid-0.25 mol L(-1) sodium acetate buffer solution was about 85%.
authors.affiliation: University Politehnica of Timişoara, 300006 Piaţa Victoriei 2, Timişoara, Romania. nicolae.vaszilcsin@chim.upt.ro
authors.forename: Nicolae
authors.initials: N
authors.lastname: Vaszilcsin
authors.forename: Valentin
authors.initials: V
authors.lastname: Ordodi
authors.forename: Alexandra
authors.initials: A
authors.lastname: Borza
mesh_terms: D000082:Acetaminophen / Q000737:chemistry*; D019342:Acetic Acid / Q000737:chemistry; D002220:Carbamazepine / Q000737:chemistry*; D003343:Corrosion; D059027:Recycling; D019346:Sodium Acetate / Q000737:chemistry; D013232:Steel / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013607:Tablets
chemical_list: D013464:Sulfuric Acids; D013607:Tablets; D013232:Steel; D002220:Carbamazepine; D000082:Acetaminophen; D019346:Sodium Acetate; C033158:sulfuric acid; D019342:Acetic Acid