Journal
METALS AND MATERIALS INTERNATIONAL
Volume 22, Issue 4, Pages 621-629Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-016-5684-7
Keywords
adhesives; metals; corrosion; electrochemistry; scanning electron spectroscopy (SEM)
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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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