Corrosion inhibition of copper in ferric chloride solutions with organic inhibitors

Omer Sisso; Snir Dor; David Eliyahu; Eyal Sabatani; Noam Eliaz

doi:10.1038/s41529-020-00139-0

Corrosion inhibition of copper in ferric chloride solutions with organic inhibitors

Omer Sisso, Snir Dor, David Eliyahu, Eyal Sabatani, Noam Eliaz

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Ferric chloride (FeCl₃) has widespread use as an etchant in the PCB industry and for photochemical machining. Although the corrosion process of copper in FeCl₃ is well known, the use of organic inhibitors of copper corrosion in FeCl₃ solutions has not been reported. Such inhibition may allow microfabrication of special PCB designs and electrochemical sensors. Here, we investigate the inhibition of copper corrosion by FeCl₃ (0.10 or 2.46 M) solutions with organic inhibitors. The most promising inhibitors are identified, investigated in 0.01 M FeCl₃ solution using electrochemical techniques at different temperatures and exposure times, and the modified surfaces of copper are characterized by a variety of techniques in order to determine the inhibition mechanism. 5-methyl-1H-benzotriazole (MBTA, 65 mM) and 1H-benzotriazole (BTA, 65 mM) are found to be the most attractive inhibitors, with inhibition efficiencies between 96.5% and 99.5% at room temperature, depending on the exposure time and the measurement technique.

Original language	English
Article number	38
Journal	npj Materials Degradation
Volume	4
Issue number	1
DOIs	https://doi.org/10.1038/s41529-020-00139-0
State	Published - Dec 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

Funding

We gratefully acknowledge the financial support from the Israel Ministry of Defense (grant no. 4440932895). We thank Dr. Larisa Burstein and Dr. Pini Shekhter from the Wolfson Applied Materials Research Centre at Tel-Aviv University for AES/XPS measurements and data analysis. We thank Dr. Nabasmita Maity for her peer review and constructive remarks, and Mr. Nadav Genosar for his helpful advice with SKP measurements.

Funders	Funder number
Ministry of Defense	4440932895

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abstract = "Ferric chloride (FeCl3) has widespread use as an etchant in the PCB industry and for photochemical machining. Although the corrosion process of copper in FeCl3 is well known, the use of organic inhibitors of copper corrosion in FeCl3 solutions has not been reported. Such inhibition may allow microfabrication of special PCB designs and electrochemical sensors. Here, we investigate the inhibition of copper corrosion by FeCl3 (0.10 or 2.46 M) solutions with organic inhibitors. The most promising inhibitors are identified, investigated in 0.01 M FeCl3 solution using electrochemical techniques at different temperatures and exposure times, and the modified surfaces of copper are characterized by a variety of techniques in order to determine the inhibition mechanism. 5-methyl-1H-benzotriazole (MBTA, 65 mM) and 1H-benzotriazole (BTA, 65 mM) are found to be the most attractive inhibitors, with inhibition efficiencies between 96.5% and 99.5% at room temperature, depending on the exposure time and the measurement technique.",

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AU - Eliyahu, David

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AU - Eliaz, Noam

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N2 - Ferric chloride (FeCl3) has widespread use as an etchant in the PCB industry and for photochemical machining. Although the corrosion process of copper in FeCl3 is well known, the use of organic inhibitors of copper corrosion in FeCl3 solutions has not been reported. Such inhibition may allow microfabrication of special PCB designs and electrochemical sensors. Here, we investigate the inhibition of copper corrosion by FeCl3 (0.10 or 2.46 M) solutions with organic inhibitors. The most promising inhibitors are identified, investigated in 0.01 M FeCl3 solution using electrochemical techniques at different temperatures and exposure times, and the modified surfaces of copper are characterized by a variety of techniques in order to determine the inhibition mechanism. 5-methyl-1H-benzotriazole (MBTA, 65 mM) and 1H-benzotriazole (BTA, 65 mM) are found to be the most attractive inhibitors, with inhibition efficiencies between 96.5% and 99.5% at room temperature, depending on the exposure time and the measurement technique.

AB - Ferric chloride (FeCl3) has widespread use as an etchant in the PCB industry and for photochemical machining. Although the corrosion process of copper in FeCl3 is well known, the use of organic inhibitors of copper corrosion in FeCl3 solutions has not been reported. Such inhibition may allow microfabrication of special PCB designs and electrochemical sensors. Here, we investigate the inhibition of copper corrosion by FeCl3 (0.10 or 2.46 M) solutions with organic inhibitors. The most promising inhibitors are identified, investigated in 0.01 M FeCl3 solution using electrochemical techniques at different temperatures and exposure times, and the modified surfaces of copper are characterized by a variety of techniques in order to determine the inhibition mechanism. 5-methyl-1H-benzotriazole (MBTA, 65 mM) and 1H-benzotriazole (BTA, 65 mM) are found to be the most attractive inhibitors, with inhibition efficiencies between 96.5% and 99.5% at room temperature, depending on the exposure time and the measurement technique.

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Corrosion inhibition of copper in ferric chloride solutions with organic inhibitors

Abstract

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