title: Inhibition effect of phosphorus-based chemicals on corrosion of carbon steel in secondary-treated municipal wastewater.
abstract: Secondary-treated municipal wastewater (MWW) could supply a viable alternative water resource for cooling water systems. Inorganic salts in the concentrated cooling water pose a great challenge to corrosion control chemicals. In this study, the inhibition effect of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), trimethylene phosphonic acid (ATMP) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) on corrosion of carbon steel in secondary-treated MWW was investigated by the means of potentiodynamic polarization and electrochemical impedance spectroscopy. The inhibition effect increased with increasing concentration of inhibitors. The corrosion rates of carbon steel were 1.5, 0.8, 0.2 and 0.5 mm a(-1) for blank, HEDP, ATMP and PBTCA samples at 50 mg L(-1), respectively. The phosphorus-based chemicals could adsorb onto the surface of the carbon steel electrode, form a coat of protective film and then protect the carbon steel from corrosion in the test solution.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, China.
authors.forename: Zhanhui
authors.initials: Z
authors.lastname: Shen
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Ren
authors.forename: Ke
authors.initials: K
authors.lastname: Xu
authors.forename: Jinju
authors.initials: J
authors.lastname: Geng
authors.forename: Lili
authors.initials: L
authors.lastname: Ding
mesh_terms: D000327:Adsorption; D003343:Corrosion; D004563:Electrochemistry; D004566:Electrodes; D009943:Organophosphorus Compounds / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*; D014865:Waste Disposal, Fluid
chemical_list: D009943:Organophosphorus Compounds; D013232:Steel