A Study on Pitting Resistance of TiN Film Coated on Inconel 600 by CPP Test in High Temperature NaCl Solution

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J. Korean Ceram. Soc. > Volume 32(11); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(11): 1301.

nconel 600위에 증착된 TiN 박막의 고온 NaCl 수용액에서의 CPP 실험에 의한 핏팅저항성의 연구

김용일, 정한섭¹, 김홍회¹, 이원종

한국과학기술원 재료공학과
¹한국원자력연구소 신소재개발실

A Study on Pitting Resistance of TiN Film Coated on Inconel 600 by CPP Test in High Temperature NaCl Solution

ABSTRACT

Pitting corrosion of TiN film deposited on Inconel 600 by plasma assisted chemical vapor deposition (PACVD) was investigated. Cyclic potentiodynamic polarization (CPP) tests were conducted in order to determine the pit nucleation potentials, Enp, of the TiN-deposited sample and the bare Inconel 600 in deaerated NaCl solution at 25, 135 and 20$0^{circ}C$. The effects of the TiN film thickness, the solution temperature and the Cl- concentration on Enp were studied. Enp of the TiN-deposited sample which had the film thickness above 1${mu}{textrm}{m}$ were higher than those of the bare Inconel 600 by 300~600mV at all the solution temperatures, implying the pitting resistance improvement of the TiN film. The morphologies of the pits generated after immersion test were examined with a scaning electron microscopy. The higher was the solution temperature, the more corrosion products, mainly composed of Cr and Ni oxides, were formed.

Key words: PACVD, TiN, Inconel 600, Pitting corrosion