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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2014

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Influence of Fe and Al addition on corrosion resistance of CoCrMoW alloy

Petka O., Reimann Ł.

Journal of Achievements in Materials and Manufacturing Engineering

2014

Vol. 62, nr 1

10--18

Purpose: The aim of this study was to evaluate the influence of alloying additions iron or aluminium on corrosion resistance in artificial saliva solution of a dental cobalt alloy Remanium 2000+ after casting. Design/methodology/approach: Pitting corrosion resistance was evaluated on the basis of anodic polarization curves obtained during electrochemical potentiodynamic polarization tests, which was also performed for samples after one and twelve hours of passivation. Corrosion potential, repassivation potential and corrosion current were picked as an assessment criteria. Findings: Results obtained in the test showed that both alloying additions have a slight influence on the pitting corrosion resistance of the tested alloy. Nevertheless, comparing iron and aluminium additions, corrosion parameters values were better for samples admixed with aluminium. On the basis of microscopic observations it was stated, that tested alloys have the structure with noticeable dendritic segregation. Research limitations/implications: The research was carried out on samples, not on final elements. Tests were carried out in in vitro conditions. Practical implications: Scientific research of cobalt alloys, as materials used for dentures, allows to specify the influence of alloying additions on material properties. It is always important to determine the nature of the impact of a specific element. Originality/value: The aim of the paper is to improve corrosion resistance of Co based alloy by modification of the original chemical composition.