4.7 Article

Removal of Copper Corrosion Products by Using Green Deep Eutectic Solvent and Bio-Derivative Cellulose Membrane

Journal

POLYMERS
Volume 14, Issue 11, Pages -

Publisher

MDPI
DOI: 10.3390/polym14112284

Keywords

corrosion removal; electrochemical corrosion; copper artifacts; deep eutectic solvent (DES)

Funding

  1. Sapienza University of Rome [RM120172B3B81486, AR22117A8B065C01]
  2. POR FESR Lazio 2014-2020, Progetti Strategici 2019-Eco-Rete Green ECONOMIA CIRCOLARE: Recupero di plastiche e legno con tecnologie green [A0320-2019-28160]
  3. ARCHMAT EMJMD European Master in ARCHaeological MATerials Science

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This article proposes a safe and environmentally friendly material for corrosion removal from metals using a deep eutectic solvent. The solvent, composed of choline chloride and ascorbic acid, effectively dissolves corroded copper without aggressive effects on other materials. By integrating the solvent with cellulose-based membranes, efficient cleaning of electrochemically corroded copper was achieved.
A safe and environmentally friendly material for corrosion removal from metals is proposed in this article. Electrochemically corroded copper was selected as a target material, and a deep eutectic solvent (DES) composed of choline chloride and ascorbic acid, in a molar ratio of 2:1, was developed to this end. Aqueous solutions of the DES with a concentration above 70 wt% were found to be effective in the dissolution of patina and less aggressive towards other materials such as CaCO3, which is the main component of limestone. These concentrated DES solutions were integrated with either cotton swabs or cellulose-based membranes and used for the cleaning of electrochemically corroded copper. The membrane containing 80 wt% DES aqueous solution exhibited the most desirable cleaning ability in terms of speed and area selectivity. X-ray diffraction analysis of the corroded copper before and after the application of the membrane was performed to demonstrate the successful corrosion removal.

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