Christian Punckt - Inhibition and Promotion of Copper Corrosion by CTAB in a Microreactor System

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  Publication Details (including relevant citation   information):

  Murira, Caroline M., Punckt, Christian, Schniepp, Hannes C.,   Khusid, Boris, Aksay, Ilhan A. 24 14269-14275-

  Abstract: We report on an optical microscopy   technique for the analysis of corrosion kinetics of metal thin   films in microreactor systems and use it to study. the role of   cetyltrimethylammonium bromide surfactant as a corrosion   inhibitor in a copper-gold galvanic coplanar microsystem. A   minimum in the dissolution rate of copper is observed when the   surfactant concentration is similar to 0.8 mM. To explain why the   inhibitory role of the surfactant does not extend to higher   concentrations, we use zero resistance ammetry with separated   half cells and show that while the surfactant inhibits cathodic   reactions on gold, it also promotes the corrosion of copper   because of the catalytic action of bromide counterions. These two   competing processes lead to the observed minimum in the   dissolution rate.

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