[Kovove materialy - Metallic materials]
    Fri - March 29, 2024 - 09:42 No. of hits : 1736646 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 48 (2010), Issue 4

Passivity of Co-Cr-Mo alloys in lactic acid solutions
BEGIC HADZIPASIC, A., MALINA, J., MATKOVIC, T.
vol. 48 (2010), no. 4, pp. 265 - 270

Abstract
The method of potentiodynamic polarization was used to obtain the electrochemical measurements of ten experimental Co-Cr-Mo alloys with different chemical composition in two solutions of 0.1 % lactic acid (LA): medium A containing Cl--ions (0.1 % LA in artificial saliva, pH 6.52) and medium B without Cl--ions (0.1 % LA in distilled water, pH 2.99). These solutions as representative of oral cavity conditions were chosen in order to see if the alloys could be used in dental practice. Wironit® was used as reference material.
In vitro experiments have shown that susceptibility to local corrosion was more pronounced in solution A. In contrast, the tendency to general corrosion was greater in solution B.
Referring to pitting potential of Wironit®, samples 3 (Co55CR40Mo5), 6 (Co60CR30Mo10) and 9 (Co55CR20Mo25) have shown the best performances with the highest Epitt value in both media. The same is valid for these three alloys if general corrosion was considered.

Key words
Co-Cr-Mo dental alloys, passivity, lactic acid, artificial saliva, corrosion properties

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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