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.
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Celem pracy była ocena odporności korozyjnej implantów do leczenia zniekształceń przedniej ściany klatki piersiowej w stanie wyjściowym oraz po określonym czasie przebywania w organizmie człowieka. W szczególności analizowano wpływ uszkodzeń mechanicznych powierzchni implantów powstałych na wskutek ich przedoperacyjnego modelowania na własności korozyjne. Badania przeprowadzono w roztworze Ringera symulującym płyny ustrojowe człowieka.
EN
The aim of the paper was to evaluate the pitting corrosion of the implants used in the treatment of anterior deformity of chest in the initial state and after given time of presence in the human’s organism. In particular the analysis focused on the influence of mechanical damage of the implants surface arisen as a result of preoperative modeling on corrosion properties. The research was conducted in Ringer's solution which simulates human's body fluids.
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