Electrochemical Corrosion Behavior of Cobalt-Chromium and Titanium-Aluminum-Vanadium Alloys Fabricated by Casting, Milling, and Laser Sintering in Acidic and Neutral Media.
Burcu Naz Bolat, Alikemal Ozdemir, Rafat Sasany, Seyed Ali Mosaddad
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引用次数: 0
Abstract
Purpose: To evaluate the electrochemical corrosion behavior, metal ion release, and weight change of cobalt-chromium (Co-Cr) and titanium-aluminum-vanadium (Ti-6Al-4V) alloys fabricated by casting, milling, and laser sintering after immersion in different media.
Materials and methods: A total of 105 disk-shaped specimens were fabricated using casting (Co-Cr only), milling, or laser sintering. Electrochemical parameters, open-circuit potential, corrosion potential (Ecorr), corrosion current density (Icorr), and corrosion rate, were obtained using a potentiostat. Specimens were immersed in artificial saliva, cola, or lemon juice for 14 days. Metal ion release was quantified by inductively coupled plasma mass spectrometry, weight change was determined gravimetrically, and surface morphology was assessed by scanning electron microscopy. Statistical analysis used a 3-way robust factorial ANOVA with post hoc tests (α=.05).
Results: Immersion solution significantly affected all corrosion parameters (p<.001), with cola producing the most aggressive profile and artificial saliva the lowest. Laser-sintered specimens showed higher corrosion rate, Icorr, ion release, and weight loss than milled specimens (p<.001). Ti-6Al-4V exhibited greater corrosion susceptibility than Co-Cr (p=.001). Significant Solution×Material interactions were observed for all parameters (p=.001), and Method×Material interactions were significant for corrosion rate, Icorr, and weight loss (p=.001). A 3-way interaction was present for Icorr and weight loss (p<.05). Cast Co-Cr also showed solution-dependent differences (p<.05).
Conclusions: Corrosion behavior of metal alloys is strongly influenced by alloy type, fabrication method, and immersion medium. Acidic beverages, particularly cola, markedly increase corrosion, whereas milled Co-Cr exhibited the most favorable resistance.
Clinical relevance: These findings may assist in comparative evaluation of dental alloy systems and fabrication methods under chemically aggressive conditions, which could be relevant for material selection in patients with increased exposure to acidic environments.
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