희생양극을 이용한 자동차 소음기의 음극방식에 관한 연구 (A study on the Sacrificial Anode Cathodic Protection for Automobile Muffler)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 42권 / 12호 / 1021 ~ 2028페이지
· 저자명 : 신동호, 심재주, 최윤석, 김정구

초록

In order to apply a sacrificial anode cathodic protection system for automotive muffler materials,
determination of reliable sacrificial anode and its protection ability were evaluated by laboratory tests in synthetic
condensed water. Three kinds of sacrificial anodes were selected: aluminum (Al), zinc (Zn) and magnesium (Mg), and
the muffler materials were Al-coated steel and uncoated steel. The corrosion behavior in synthetic condensed water
for the muffler materials and sacrificial anodes was investigated by potentiodynamic tests. The cathodic protection
ability was evaluated by galvanic corrosion test and weight-loss test. The results of the potentiodynamic test indicated
that Al was less suitable for sacrificial anode because it became passive. Mg was also unqualified due to the high
dissolution rate. However, Zn was adequate for sacrificial anode because of its low dissolution rate, high stability and
suitable potential difference. Results of weight-loss test demonstrated that the corrosion rate of Al-coated steel was
reduced from 0.028 to 0.018 mm/year, and that of uncoated steel was 0.08 to 0.002 mm/year by coupling with Zn
anode. In addition, the proper area ratio of anode to cathode was 1 : 10. From these results, it can be concluded that
Zn anode can protect both the Al-coating with passivation, and steel substrate with low dissolution rate.

영어초록

In order to apply a sacrificial anode cathodic protection system for automotive muffler materials,
determination of reliable sacrificial anode and its protection ability were evaluated by laboratory tests in synthetic
condensed water. Three kinds of sacrificial anodes were selected: aluminum (Al), zinc (Zn) and magnesium (Mg), and
the muffler materials were Al-coated steel and uncoated steel. The corrosion behavior in synthetic condensed water
for the muffler materials and sacrificial anodes was investigated by potentiodynamic tests. The cathodic protection
ability was evaluated by galvanic corrosion test and weight-loss test. The results of the potentiodynamic test indicated
that Al was less suitable for sacrificial anode because it became passive. Mg was also unqualified due to the high
dissolution rate. However, Zn was adequate for sacrificial anode because of its low dissolution rate, high stability and
suitable potential difference. Results of weight-loss test demonstrated that the corrosion rate of Al-coated steel was
reduced from 0.028 to 0.018 mm/year, and that of uncoated steel was 0.08 to 0.002 mm/year by coupling with Zn
anode. In addition, the proper area ratio of anode to cathode was 1 : 10. From these results, it can be concluded that
Zn anode can protect both the Al-coating with passivation, and steel substrate with low dissolution rate.

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