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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 103-112. doi: https://doi.org/10.3365/KJMM.2018.56.2.103
전기화학적 순환부식 시험법을 활용한 자동차 로어암의 단품단위 부식평가에 관한 연구
김선홍1, 이지훈1, 김정구1, 장민2
1성균관대학교 신소재공학과
2현대모비스 재료연구팀
Study on the Part Unit Corrosion Evaluation for Automotive Lower Arm Using Electrochemical Cyclic Corrosion Test
Seon-Hong Kim1, Ji-Hoon Lee1, Jung-Gu Kim1, Min Jang2
1School of Advanced Materials Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
2Material Research Team, R&D Division, Hyundai Mobis Co., Yongin 466-912, Republic of Korea
Correspondence  Jung-Gu Kim ,Tel: +82-31-290-7360, Email: kimjg@skku.edu
Received: 24 July 2017;  Accepted: 11 December 2017.  Published online: 5 February 2018.
ABSTRACT
This research focused on the development of the part unit evaluation for an organic coated automotive lower arm using the electrochemical cyclic corrosion test (E-CCT). The E-CCT accelerates both the coating degradation and the perforation corrosion. The applied potential for the coating degradation was determined to be -500 mVSCE for anodic polarization and -900 mVSCE for cathodic polarization. The applied current for the perforation corrosion was equivalent to the applied anodic potential. The E-CCT was conducted for the duration of 8 cycles, which is considered to be equivalent to 4 years of driving. After the E-CCT, the coating degradation was evaluated by electrochemical impedance spectroscopy (EIS) measurements. Especially, the Z100 mHz value (impedance value at a frequency of 100 mHz) of the part unit represented the amount of corrosion damage of the lower arm parts. The Z100 mHz of the degraded coating area had a decisive effect on the Z100 mHz value of the entire lower arm. This result was caused by electrochemical interaction between the non-degraded coating area and degraded coating area. The non-degraded coating area and the degraded coating area of the lower arm formed the parallel circuit which provides a satisfactory result.
Keywords: metals, oxides, coating, corrosion, electrochemistry
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