Corrosion behaviour of 1018, 410 and 800 steels in synthetic wastewater

R. Sandoval-Jabalera,^a),*,E. Arias-del Campo,^a) J.G. Chacón-Nava,^a)

J.M. Malo-Tamayo,^b) A. Martínez-Villafañe^a)

^a) Advanced Materials Research Centre, Division of Materials Deterioration and Structural Integrity, Miguel de Cervantes 120, Complejo Ind. Chihuahua,

C.P. 31109, Chihuahua, Chih. México

^b) Electrical Research Institute, Mechanical Systems Division, Av. Reforma, C.P. 62490, Cuernavaca, Mor. México

 

Received 22 November 2004; accepted November 2006

 

Abstract

The corrosion behaviour of 1018, 410 and 800 steels exposed to synthetic wastewater has been studied using linear polarization resistance (LPR), cyclic potentiodynamic curves (CPC), electrochemical noise (EN), and electrochemical impedance spectroscopy (EIS) tests. The conditions were: biochemical oxygen demand (BOD) of 776 ppm, a chemical oxygen demand (COD) of 1293 ppm, pH = 8 and the cell temperature was 24 °C. From the CPC and EN results, no localized corrosion was found for the stainless steels. However, the reverse was true for the 1018 steel. The EIS results showed that different corrosion mechanism occurred for the carbon steel compared with the stainless steels. This shows that the corrosion mechanism strongly depends on the type of steel. Overall, the 1018 steel exhibited the highest corrosion rate, followed by the 410 alloy. The highest corrosion resistance was achieved by the 800 alloy. In addition, SEM analyses were carried out to explain the experimental findings.

Keywords: carbon steel, electrochemical behaviour, stainless steels, synthetic wastewater.

 

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^*Corresponding author. E-mail address: raul.sandoval@cimav.edu.mx