| 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
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Received: 24 July 2017; Accepted: 11 December 2017. Published online: 5 February 2018. |
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| ABSTRACT |
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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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