The resistance to localized corrosion in neutral chloride medium of an AISI 304l stainless steel implanted with nitrogen and neon ions

The electrochemical behaviour of AISI 304 and 304L stainless steels implanted with N + or Ne + ions in 0.5 and 0.02 M NaCl solutions is compared. The role of dose and implantation current density are studied. Surface analyses of samples are systematically carried out before and after corrosion tests...

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Bibliographic Details
Published in:Corrosion science 1992, Vol.33 (7), p.1121-1134
Main Authors: Sabot, R., Devaux, R., de Becdelievre, A.M., Duret-Thual, C.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
corrosion resistance
Exact sciences and technology
ion implantation
Metals. Metallurgy
nitrogen
stainless steel
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Summary:The electrochemical behaviour of AISI 304 and 304L stainless steels implanted with N + or Ne + ions in 0.5 and 0.02 M NaCl solutions is compared. The role of dose and implantation current density are studied. Surface analyses of samples are systematically carried out before and after corrosion tests. The pitting potential of implanted samples are always lower than that of unimplanted ones: the defects generated by the implantation process are probably active sites for pitting. The pit propagation is hindered. The nitrides or a′-martensite layers obtained after elimination of the superficial layers (iron oxide and nickel phase) by electrochemical attack of implanted steel in acidic solution play an important role in this process.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(92)90166-Z