Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Electrochemical Approach on the Corrosion During the Cavitation of Additive Manufactured Commercially Pure Titanium

적층가공 방식으로 제조된 CP-Ti의 캐비테이션 중 부식에 대한 전기화학적 접근

  • Kim, K.T. (The Corrosion Science Society of Korea) ;
  • Chang, H.Y. (The Corrosion Science Society of Korea) ;
  • Kim, Y.S. (The Corrosion Science Society of Korea)
  • Received : 2018.12.11
  • Accepted : 2018.12.21
  • Published : 2018.12.31
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Abstract

The effect of passive film on corrosion of metals and alloys in a static corrosive environment has been studied by many researchers and is well known, however few studies have been conducted on the electrochemical measurement of metals and alloys during cavitation corrosion conditions, and there are no test standards for electrochemical measurements 'During cavitation' conditions. This study used commercially additive manufactured(AM) pure titanium in tests of anodic polarization, corrosion potential measurements, AC impedance measurements, and repassivation. Tests were performed in 3.5% NaCl solution under three conditions, 'No cavitation', 'After cavitation', and 'During cavitation' condition. When cavitation corrosion occurred, the passive current density was greatly increased, the corrosion potential largely lowered, and the passive film revealed a small polarization resistance. The current fluctuation by the passivation and repassivation phenomena was measured first, and this behavior was repeatedly generated at a very high speed. The electrochemical corrosion mechanism that occurred during cavitation corrosion was based on result of the electrochemical properties 'No cavitation', 'After cavitation', and 'During cavitation' conditions.

Keywords

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Fig. 1 Schematic diagram of the cavitation corrosion tester.

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Fig. 2 Dimension of Test specimen; (a) Specimen and screw thread, (b) Overview.

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Fig. 3 Effect of cavitation condition on anodic polarization behavior of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 4 Effect of cavitation condition on passive current density of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 5 Effect of cavitation condition on potential change by cavitation at each 30-minute intervals of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 6 Effect of cavitation condition on potential change at continuously 2 hours cavitation of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 7 Effect of cavitation condition on AC-impedance of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 8 Effect of cavitation condition on the polarization resistance of passive film obtained from AC-impedance measurement of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 9 Effect of cavitation condition on the repassivation behavior of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃.

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Fig. 10 Surface changes with cavitation corrosion time of additive manufactured CP-Ti in deaerated 3.5% NaCl solution at 25℃; (a) 0min(x500), (b) 120min(x500), (c) 120min(x5000).

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Fig. 11 New cavitation corrosion mechanism; (a) Increasing surface area after cavitation corrosion, (b) Formation of unstable passive film after cavitation corrosion, (c) Formation of unstable passive film and repeated destruction of passive film during cavitation corrosion.

Table 1 Manufacture condition of additive manufacturing specimen

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Table 2 Chemical composition of CP-Ti (wt%)

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