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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.1
- 수록면
- 621 - 629 (9page)
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This study examined the effect of L-ascorbic acid (A.A) concentration on the pitting corrosion properties of 316L stainless steel (316L STS) of heat exchanger in synthetic tap water containing 400 ppm of Cl - ion. The pitting corrosion of 316L STS can be effectively inhibited by the 10 -4 M of A.A concentration. In this condition, the adsorption of A.A reinforced the passive film of steel by blocking the Cl - ions at the active site. However, the passive film was deteriorated and severe pitting corrosion occurred above the 10 -4 M of A.A concentration. Above the 10 -4 M of A.A concentration, A.A generates soluble chelate rather than absorbs on the steel surface and it causes passive film deterioration and severe pitting corrosion. The critical ratio, which is a critical ratio of surface coverage of aggressive to inhibitive ion necessary to initiate localized corrosion, calculated 2.93 up to the 10 -4 M. It has approximately 2.93:1 ratio of the coverage of local Cl - ions to A.A. Above the critical ratio, the pitting corrosion will occur with degradation of the passive film. On the other hands, above the 10 -4 M A.A concentration caused a negative effect because the heat energy for adsorption is increased.
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참고문헌 (53)
참고문헌 신청
D. Y Lee / 2012 / Corros. Sci 64:105
B. Skagestad / 1999 / District Heating and Cooling Connection Handbook / IEA District Heating and Cooling :23~50
M. Cohen / 1946 / J. Electrochem. Soc 89:11
K. Eliseev / 2011 / District Heating Systems in Finland and Russia
R.W. Revie / 2008 / Corrosion and Corrosion Control / John Wiley & Sons, Inc :303~314
B. Skagestad / 1999 / District Heating and Cooling Connection Handbook / IEA District Heating and Cooling :23~50
M. Cohen / 1946 / J. Electrochem. Soc 89:11
K. Eliseev / 2011 / District Heating Systems in Finland and Russia
R.W. Revie / 2008 / Corrosion and Corrosion Control / John Wiley & Sons, Inc :303~314
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