Chemical passivation as a method of improving the electrochemical corrosion resistance of Co-Cr-based dental alloy

• Autorzy: Rylska D. , Sokołowski G. , Łukomska-Szymańska M.

Identyfikatory

DOI

10.5277/ABB-00600-2016-04

• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the study was to evaluate corrosion resistance of Wirobond C® alloy after chemical passivation treatment. Methods: The alloy surface undergone chemical passivation treatment in four different media. Corrosion studies were carried out by means of electrochemical methods in saline solution. Corrosion effects were determined using SEM. Results: The greatest increase in the alloy polarization resistance was observed for passive layer produced in Na2SO4 solution with graphite. The same layer caused the highest increase in corrosion current. Generally speaking, the alloy passivation in Na2SO4 solution with graphite caused a substantial improvement of the corrosion resistance. The sample after passivation in Na2SO4 solution without graphite, contrary to others, lost its protective properties along with successive anodic polarization cycles. The alloy passivation in Na3PO4 solution with graphite was the only one that caused a decrease in the alloy corrosion properties. The SEM studies of all samples after chemical passivation revealed no pit corrosion – in contrast to the sample without any modification. Conclusions: Every successive polarization cycle in anodic direction of pure Wirobond C® alloy enhances corrosion resistance shifting corrosion potential in the positive direction and decreasing corrosion current value. The chemical passivation in solutions with low pH values decreases susceptibility to electrochemical corrosion of Co-Cr dental alloy. The best protection against corrosion was obtained after chemical passivation of Wirobond C® in Na2SO4 solution with graphite. Passivation with Na2SO4 in solution of high pH does not cause an increase in corrosion resistance of WIROBOND C. Passivation process increases alloy resistance to pit corrosion.

Słowa kluczowe

EN

corrosion resistance; dental alloys; electrochemical test; chemical passivation

PL

odporność korozyjna; stop stomatologiczny; test elektrochemiczny; pasywacja chemiczna

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2017
• Tom: Vol. 19, no. 2
• Strony: 73--78
• Opis fizyczny: Bibliogr. 33 poz., rys., wykr.

Twórcy

autor

Rylska D.

• Faculty of Mechanical Engineering, Technical University of Lodz, Lodz, Poland

autor

Sokołowski G.

• Department of Prosthodontics, Medical University of Lodz, Lodz, Poland

autor

Łukomska-Szymańska M.

• Department of General Dentistry, Medical University of Lodz, Lodz, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).