Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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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)

적층가공 (3D 프린팅) Ti-6Al-4V합금의 국부부식 저항성 평가를 위한 임계국부부식온도와 임계국부부식전위 측정방법의 비교

  • Seo, Dong-Il (School of Advanced Materials Engineering, Kookmin University) ;
  • Lee, Jae-Bong (School of Advanced Materials Engineering, Kookmin University)
  • 서동일 (국민대학교 공과대학 신소재 공학부) ;
  • 이재봉 (국민대학교 공과대학 신소재 공학부)
  • Received : 2021.01.20
  • Accepted : 2021.02.10
  • Published : 2021.02.26
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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

Acknowledgement

이 연구는 2019년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구임(20006868).

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