전기화학 임피던스 분석을 통한 자동차용 코일스프링 강의 부식 평가
Study on Corrosion of Automotive Coil Spring Steel by Electrochemical Impedance Spectroscopy
1
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
Coil spring steels from the automobile suspension part after field exposure for 10 years and those afteranti-corrosion validation test in proving ground of 5,000 ~ 10,000 km were examined for corrosion damages. Partial loss of paint, accumulation of corrosion product, and cracking of paint and superficial material wereobserved. The surface and subsurface region of spring steels had compressive residual stress and high hardnessby shot peening. The surface hardness values of the specimens were 620 ~ 670 Hv. They were 60 ~ 80Hv higher than those of the samples taken from the middle part of the spring. The maximum compressivestress was -916 ~ -1208 MPa measured at depth of about 100 μm. Electrochemical impedance spectroscopyshowed that the resistances of charge transfer and the paint layer of the spring steels ranged from severaltens to millions Ω∙cm2. The resistance of the field samples was much higher than that of the proving groundsamples used in this study, implying that the proving ground test condition would be more corrosive thanthe field environment.
Abstract
Coil spring steels from the automobile suspension part after field exposure for 10 years and those afteranti-corrosion validation test in proving ground of 5,000 ~ 10,000 km were examined for corrosion damages. Partial loss of paint, accumulation of corrosion product, and cracking of paint and superficial material wereobserved. The surface and subsurface region of spring steels had compressive residual stress and high hardnessby shot peening. The surface hardness values of the specimens were 620 ~ 670 Hv. They were 60 ~ 80Hv higher than those of the samples taken from the middle part of the spring. The maximum compressivestress was -916 ~ -1208 MPa measured at depth of about 100 μm. Electrochemical impedance spectroscopyshowed that the resistances of charge transfer and the paint layer of the spring steels ranged from severaltens to millions Ω∙cm2. The resistance of the field samples was much higher than that of the proving groundsamples used in this study, implying that the proving ground test condition would be more corrosive thanthe field environment.
참고문헌 (17)
- 박경동, "압축잔류응력을 부여한 스프링강의 부식피로 수명평가", 한국자동차공학회 논문집, 15(1), pp.1~7 (2007), 한국자동차공학회
- D. L. Seo, , Proc. KSAE Conf., pp.1344~ (2012), KSAE
- G. Y. Lee, , Proc. KSAE Conf, pp.102~ (2004), KSAE
- D. H. Bae, , Key engineering materials, 306-308, pp.459~ (2006)
- D. H. Bae, , Key Engineering Materials, 297-300, pp.357~ (2005)
- J. Matejicek, , Materials Science and Engineering: A, 367, pp.306~ (2004)
- S. K. Das, , Engineering Failure Analysis, 14, pp.158~ (2007)
- L. Del Llano-Vizcaya, , Materials & design, 28, pp.1130~ (2007)
- H. Mano, , Proc. 2006International Symposium on Micro-NanoMechatronics and Human Science Conf., pp.1~ (2006), IEEE
- G. J. Kim, , M. S., pp.2001
- M. S. Lim, "Cold coil spring heat treatment method for improvement of inner side residual stress and fatigue life, 10-2013-0127481 (2013.10.25)", ~ (2013)
- M. S. Lim, "Surface treatment method of coil spring, 10-2011-0116842 (2011.11.10)", ~ (2011)
- I. Kazuya, "Compression coil spring and method for producing same, 10-2015-7009184 (2011.08.11)", ~ (2011)
- T. Akira, "Coil spring for a suspension of an automobile and manufacturing method thereof, 10-2010-7006561(2009. 06. 17)", ~ (2009)
- H. G. Go, "Spring manufacturing method, 10-2014-0133138(2014.10.02)", ~ (2014)
- W. Smith, "Structure and properties of Engineering Alloys", pp.29~32 (1990), McGraw-Hill
- Y. Nakajima, "Materials of Automotive", pp.122~ (1997), Golden bell