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http://dx.doi.org/10.14773/cst.2021.20.1.37

Measurement of Localized Corrosion Resistance in Additively Manufactured Ti-6Al-4V Alloys Using Electrochemical Critical Localized Corrosion Temperature (E-CLCT) versus Electrochemical Critical Localized Corrosion Potential (E-CLCP)  

Seo, Dong-Il (School of Advanced Materials Engineering, Kookmin University)
Lee, Jae-Bong (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Corrosion Science and Technology / v.20, no.1, 2021 , pp. 37-43 More about this Journal
Abstract
Additively manufactured (AM) Ti-6Al-4V alloys exhibit a dominant acicular martensite phase (α'), which is characterized by an unstable energy state and highly localized corrosion susceptibility. Electrochemical critical localized corrosion temperature (E-CLCT, ISO 22910: 2020) and electrochemical critical localized corrosion potential (E-CLCP, ISO AWI 4631: 2021) were measured to analyze the localized corrosion resistance of the AM Ti-6Al-4V alloy. Although E-CLCP was measured under mild corrosive conditions such as human body, the validity of evaluating localized corrosion resistance of AM titanium alloys was demonstrated by comparison with E-CLCT. However, the mechanisms of resistance to localized corrosion on the as-received and heat-treated AM Ti-6Al-4V alloys under E-CLCT and E-CLCP differ at various temperatures because of differences in properties under localized corrosion and repassivation. The E-CLCT is mainly measured for initiation of localized corrosion on the AM titanium alloys based on temperature, whereas the E-CLCP yields repassivation potential of re-generated passive films of AM titanium alloys after breaking down.
Keywords
Ti-6Al-4V; Additive manufacturing; E-CLCT; E-CLCP; Repassivation;
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