Corrosion resistance and cytotoxicity of stainless steels exposed to chloride solutions

Authors

DOI:

https://doi.org/10.5327/Z1414-4425202328908%20

Keywords:

Stainless steel, Corrosion, Chlorides, Toxicity

Abstract

Objective: To analyze the pitting corrosion resistance of AISI 304 and AISI 420 stainless steels in chloride-containing medium (0.9 and 3.5% NaCl solution, by weight), as well as their cytotoxicity,in vitro, in samples with and without pitting corrosion. Method: This is an experimental study. Cyclic potentiodynamic polarization (CPP) techniques were used to characterize the extent and shape of the corrosive attack on the samples. The agar diffusion and viability evaluation method of the NCTC clone 929 cell line (CCIAL 020) was used to evaluate the cytotoxicity of samples of steels with and without pitting. Results: The AISI 304 steel showed superior corrosion resistance to the AISI 420 steel. The values of the pitting potentials decreased for both steels when the chloride concentration in the aggressive solution was increased. There was moderate cell toxicity (grade 3 — ISO 10993-5) in all samples. Conclusions: The results corroborated the recommendations to avoid unnecessary immersion of the instruments in saline solutions. Moderate cytotoxicity to these steels contraindicates their use in implantable devices, only in surgical instruments.

Author Biographies

Brunela Pereira da Silva, Universidade de São Paulo, Escola Politécnica, Departamento de Engenharia Química – São Paulo (SP), Brasil.

Chemical Engineer, PhD in Chemical Engineering from the Polytechnic School of the University of São Paulo (Poli-USP), works at the Corrosion Electrochemistry Laboratory of the Department of Chemical Engineering at the Polytechnic School of the University of São Paulo (Poli-USP), São Paulo – SP

Aurea Silveira Cruz, Instituto Adolfo Lutz – São Paulo (SP), Brasil.

Biologist, PhD in Drugs and Medicines from the Faculty of Pharmaceutical Sciences of the University of São Paulo (USP), technical director I of the Cell Culture Center of the Adolfo Lutz Institute, São Paulo – SP

Kazuko Uchikawa Graziano, Universidade de São Paulo, Escola de Enfermagem – São Paulo (SP), Brasil.

Nurse, PhD from the School of Nursing of the University of São Paulo (EEUSP), Senior Professor for the provision of voluntary services at the EEUSP, São Paulo – SP.

Idalina Vieira Aoki, Universidade de São Paulo, Departamento de Engenharia Química – São Paulo (SP), Brasil.

Chemistry, PhD in Chemical Engineering at the University of São Paulo (USP), Associate Professor at the University of São Paulo in the Department of Chemical Engineering, São Paulo – SP

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Published

2024-02-07

How to Cite

Júnior, W. de A., Silva, B. P. da, Cruz, A. S., Graziano, K. U., & Aoki, I. V. (2024). Corrosion resistance and cytotoxicity of stainless steels exposed to chloride solutions. Revista SOBECC, 29. https://doi.org/10.5327/Z1414-4425202328908

Issue

Vol. 29 (2024)

Section

ORIGINAL ARTICLES

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Copyright (c) 2024 Wagner de Aguiar Júnior, Brunela Pereira da Silva, Aurea Silveira Cruz, Kazuko Uchikawa Graziano, Idalina Vieira Aoki

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