ANODIC DESORPTION OF INHIBITORS Ⅲ.MECHANISM OF INHIBITOR DESORPTION

J Chin Soc Corr Pro

1996, Vol. 16

Issue (1): 9-14 DOI:

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ANODIC DESORPTION OF INHIBITORS Ⅲ.MECHANISM OF INHIBITOR DESORPTION

Wang Jia; Cao Chunan(Institute of Oceanology;Chinese Academy of Sciences)(Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences;The Laboratory of Corrosion Sciences)

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Abstract The mechanism of inhibitor desorption from an anodically polarized electrode was studied on basis of electrochemical measurements. It was indicated that the inhibitor coverage on electrode surface remained unchanged in the range of applied potential lower than the desorption potential (Edes), and decreased rapidly as it reached the Edes. It was also showed that the inhibitor with stronger adsorbility possessed a relatively high desorption potential and that increasing inhibitor concentration and addition of chloride also resulted in a positive shift in Edes. The resistance of adsorbed layer to anodic dissolution, however,had begun to decrease gradually even before the potential reached the Edes. According to the analysis mentioned above, an assumption was proposed that the inhibitor desorption was caused by the lash of dissolving metal ions against the adsorbed inhibitor layer, and the large scale desorption occurred only after attainment of the desorption potential because the reabsorption rate of inhibitor for mending the inhibitor layer destroyed was lower than the desorption rate.

Key words: Desorption Inhibitor Mechanism

Received: 25 February 1996

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Cite this article:

Wang Jia; Cao Chunan(Institute of Oceanology;Chinese Academy of Sciences)(Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences;The Laboratory of Corrosion Sciences). ANODIC DESORPTION OF INHIBITORS Ⅲ.MECHANISM OF INHIBITOR DESORPTION. J Chin Soc Corr Pro, 1996, 16(1): 9-14.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I1/9

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