Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (47권6호 323-329)

Effect of Sealing Materials and Parameters on the Corrosion Resistance of HVOF-Sprayed CrC-NiCr Coatings

실링재 및 실링방법이 HVOF 용사된 CrC-NiCr 코팅의 내식성에 미치는 영향

정영훈;남욱희;변응선;강태일;강정윤;
Jeong, Younghun;Nam, Uk-Hee;Byon, Eungsun;Kang, Tae-Il;Kang, Chung-Yun;

재료연구소 표면기술연구본부 플라즈마코팅연구실;동양기전(주) 유압기기사업부, 연구개발팀;부산대학교 공과대학 재료공학부;
Surface Technology Department, Korea Institute of Materials and Science;Hydraulic Machinery Division, Dongyang Mechatronics;School of Materials Science and Engineering, Pusan National University;

DOI : 10.5695/JKISE.2014.47.6.323

Abstract

Effects of sealant and sealing procedure on corrosion resistance of high velocity oxy-fuel (HVOF) sprayed coatings were studied. HVOF-sprayed CrC-20NiCr coatings were sealed using three commercial sealants based on phenolics and epoxy. Penetration depth of sealants, measured by fluorescent microscope technique, was between $19{mu}m$ and $340{mu}m$ depending on sealant, sealing condition or sealing procedure. It was found that sealing on rotation status was more effective than that on stationary specimen due to the Coriolis effect of fluid in pores of the coating. From the CASS results, corrosion resistance of properly sealed CrC-20NiCr coatings was equal to that of hexa-valent chromium plating.

Keywords

High Velocity Oxy-Fuel;HVOF;Thermal spray coatings;Corrosion resistance;Sealing;Porosity;Hexa-valent chromium plating;