Effect of ascorbic acid on the pitting resistance of 316L stainless steel in synthetic tap water

被引:18
|
作者
Hong, Min-Sung [1 ]
Kim, Seon-Hong [1 ]
Im, Shin-Young [2 ]
Kim, Jung-Gu [1 ]
机构
[1] Sungkyunkwan Univ, Dept Adv Mat Engn, Suwon 16419, South Korea
[2] Ajou Univ, Div Energy Syst Res, Suwon 16499, South Korea
关键词
adhesives; metals; corrosion; electrochemistry; scanning electron spectroscopy (SEM); CORROSION BEHAVIOR; SULFURIC-ACID; CARBON-STEEL; CREVICE CORROSION; IRON CORROSION; MILD-STEEL; INHIBITION; ADSORPTION; MICROSTRUCTURE; ELECTRODES;
D O I
10.1007/s12540-016-5684-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:621 / 629
页数:9
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