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Biocorrosion of AISI 4340 Steel

Published online by Cambridge University Press:  22 February 2012

Sabrina M. Rovetta ,
Antonio J. Abdalla ,
Sonia Khouri ,
Choyu Otani  and
Walter Miyakawa
Sabrina M. Rovetta
Affiliation:
Vale do Paraíba University, Av. Shishima Hifumi, 2911, São José dos Campos, SP, Brazil. Photonics Division, Instituto de Estudos Avançados, Trevo Cel. Av. José A. A. Amarante, 1, São José dos Campos, SP, Brazil.
Antonio J. Abdalla
Affiliation:
Photonics Division, Instituto de Estudos Avançados, Trevo Cel. Av. José A. A. Amarante, 1, São José dos Campos, SP, Brazil.
Sonia Khouri
Affiliation:
Vale do Paraíba University, Av. Shishima Hifumi, 2911, São José dos Campos, SP, Brazil.
Choyu Otani
Affiliation:
Physics Department, Instituto Tecnológico de Aeronáutica, Praça Mar. Eduardo Gomes, 50, São José dos Campos, SP, Brazil.
Walter Miyakawa
Affiliation:
Photonics Division, Instituto de Estudos Avançados, Trevo Cel. Av. José A. A. Amarante, 1, São José dos Campos, SP, Brazil.
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Abstract

The objective of the present work is to evaluate the Penicillium candidum filamentous fungi biocorrosion effects on AISI 4340 steel. Small AISI 4340 steel blocks are exposed to a biocorrosion process inside glass tubes containing culture media (Sabouraud Dextrose HIMEDIA broth) inoculated with Penicillium candidum spores for 14 days, at 25ºC constant temperature. The surface microstructures are evaluated by scanning electron microscopy, atomic force microscopy, and the chemical composition by energy dispersive X-ray spectroscopy. Comparison of micrographies before and after biocorrosion shows that surface structures present morphological alterations, suggesting corrosion wear. Grain contours can no longer be visualized and oxygen content on the steel surface increases to 32% after biocorrosion. Besides, topographic parameters like root mean square roughness (Rms), arithmetic mean roughness (Ra) and mean roughness (Rz) increase 57%, 132%, and 71%, respectively, from their initial values. It is concluded that AISI 4340 steel is reasonably susceptible to corrosion.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1373: Symposium S4 – Advanced Structural Materials—2011 , 2012 , imrc-1373-s4-11
Copyright
Copyright © Materials Research Society 2012

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References

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