Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2990
Título: The effect of the angle of incidence on the aqueous corrosion of ion implanted M50 steel substrates
Autor: Rangel, C. N.
Simplício, M. H.
Consiglieri, A. C.
Nielsen, B. R.
Torp, B.
Teixeira, Nuno
Alves, J. G.
Silva, M. F. da
Soares, J. C.
Dodd, A.
Kinder, J.
Palavras-chave: M50 steel
Electrochemical behaviour
Data: Abr-1992
Editora: Elsevier
Citação: Rangel CN, Simplício MH, Consiglieri AC, Nielsen BR, Torp B, Teixeira N, et al. The effect of the angle of incidence on the aqueous corrosion of ion implanted M50 steel substrates. Surf Coat Technol. 1992;51(1-3):483-8.
Resumo: Following work on tantalum and chromium implanted flat M50 steel substrates, this work reports on the electrochemical behaviour of M50 steel implanted with tantalum and chromium and the effect of the angle of incidence. Proposed optimum doses for resistance to chloride attack were based on the interpretation of results obtained during long-term and accelerated electrochemical testing. After dose optimization from the corrosion viewpoint, substrates were implanted at different angles of incidence (15°, 30°, 45°, 60°, 75°, 90°) and their susceptibility to localized corrosion assessed using open-circuit measurements, step by step polarization and cyclic voltammetry at several scan rates (5–50 mV s-1). Results showed, for tantalum implanted samples, an ennoblement of the pitting potential of approximately 0.5 V for an angle of incidence of 90°. A retained dose of 5 × 1016 atoms cm-2 was found by depth profiling with Rutherford backscattering spectrometry. The retained dose decreases rapidly with angle of incidence. The breakdown potential varies roughly linearly with the angle of incidence up to 30° falling fast to reach -0.1 V (vs. a saturated calomel electrode (SCE)) for 15°. Chromium was found to behave differently. Maximum corrosion resistance was found for angles of 45°–60° according to current densities and breakdown potentials. Cr+ depth profiles ((p,γ) resonance broadening method), showed that retained doses up to an angle of 60° did not change much from the implanted dose at 90°, 2 × 1017 Cr atoms cm-2. The retained implantation dose for tantalum and chromium was found to follow a (cos θ)8/3 dependence where θ is the angle between the sample normal and the beam direction.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2990
ISSN: 1879-3347
Versão do Editor: http://www.sciencedirect.com/science/article/pii/025789729290286J
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