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Article Dans Une Revue Electrochimica Acta Année : 2023

Enhanced corrosion inhibition of copper in acidic environment by cathodic control of interface formation with 2-mercaptobenzothiazole

Sagar B Sharma
Sandrine Zanna
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Antoine Seyeux
Frédéric Wiame
Vincent Maurice
Philippe Marcus

Résumé

Electrochemistry along with advanced surface analyses (X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry) were implemented to investigate copper corrosion inhibition by 2-mercaptobenzothiazole (2-MBT) in hydrochloric aqueous solution and the effects of electrochemical control on the formation of the inhibiting interface. It is shown that reducing the native surface oxide by cathodic reduction prior to exposure to the inhibitor drastically decreases the rate of anodic dissolution. Additionally, increasing the exposure time of the metal surface to the inhibitor results in even better protection against dissolution. 2-MBT adsorbs as multilayers and bonds to both metallic copper and residual copper oxide islands via its sulphur atoms. Partial dissociation of the molecule, releasing the exocyclic sulphur, which then bonds to metallic Cu, is observed. Further dissociation of the molecule, releasing the endocyclic sulphur, is induced by anodic polarization, forming defects in the organic layer and thus compromising the barrier properties of the organic layer.
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Dates et versions

hal-04020971 , version 1 (09-03-2023)

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Vishant Garg, Sagar B Sharma, Sandrine Zanna, Antoine Seyeux, Frédéric Wiame, et al.. Enhanced corrosion inhibition of copper in acidic environment by cathodic control of interface formation with 2-mercaptobenzothiazole. Electrochimica Acta, 2023, 447, pp.142162. ⟨10.1016/j.electacta.2023.142162⟩. ⟨hal-04020971⟩
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