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Pitting corrosion resistance of austenitic and superaustenitic stainless steels in aqueous medium of NaCl and H2SO4

Published online by Cambridge University Press:  24 May 2016

Jorge Luiz Cardoso ,
Alfredo Leão Silva Nunes Cavalcante ,
Regina Coeli Araujo Vieira ,
Pedro de Lima-Neto  and
Marcelo J. Gomes da Silva Open the ORCID record for Marcelo J. Gomes da Silva [Opens in a new window]
Jorge Luiz Cardoso*
Affiliation:
Department of Metallurgical and Materials Engineering, Technology Center, Federal University of Ceará, Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Alfredo Leão Silva Nunes Cavalcante
Affiliation:
Department of Metallurgical and Materials Engineering, Technology Center, Federal University of Ceará, Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Regina Coeli Araujo Vieira
Affiliation:
Department of Metallurgical and Materials Engineering, Technology Center, Federal University of Ceará, Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Pedro de Lima-Neto
Affiliation:
Department of Analytical Chemistry and Physical Chemistry, Science Center, Federal University of Ceará, Campus do Pici, bloco 940, Fortaleza 60440-900, Ceará, Brazil
Marcelo J. Gomes da Silva
Affiliation:
Department of Metallurgical and Materials Engineering, Technology Center, Federal University of Ceará, Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The pitting corrosion resistance of AL-6XN PLUS™ superaustenitic stainless steel, 304L, 316L, and 317L austenitic stainless steels was investigated using the cyclic polarization technique. These materials were evaluated in the as received condition and heat-treated at temperatures between 500 °C and 900 °C for 72 h. A thermodynamic simulation was performed using the software Thermocalc® to predict possible deleterious phases in selected temperatures. The simulations have predicted the sigma phase in the selected temperature range. An aqueous solution of sulfuric acid and sodium chloride was used as electrolyte in the corrosion tests. The results showed that pitting corrosion was not observed on the samples of AL-6XN PLUS™ steel. The 304L steel suffered pitting corrosion. All the polarization curves of this steel showed hysteresis characteristics of pitting corrosion. The 316L and 317L steels were resistant to pitting corrosion, but susceptible to crevice corrosion.

Keywords

corrosionsecond phasessteel
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1755 - 1763
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Copyright
Copyright © Materials Research Society 2016 

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