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Article

Chemical Removal of Lead Corrosion Products

1
Department of Metallic Construction Materials, Technopark Kralupy of the University of Chemistry and Technology Prague, Nám. G. Karse 7, 278 01 Kralupy nad Vltavou, Czech Republic
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Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5672; https://doi.org/10.3390/ma13245672
Received: 1 November 2020 / Revised: 2 December 2020 / Accepted: 10 December 2020 / Published: 12 December 2020
Restoration treatment, specimen preparation or mass loss measurements on coupons made of lead require a reliable process of dissolution of corrosion products. In this study, several types of model corrosion products with compositions representative of those found on real objects were prepared and characterized. Ten solutions were then thoroughly tested in interval cleaning experiments, regarding the efficiency of removal of the corrosion products, corrosivity towards bare lead, and remnants left on the surface. The solution recommended in the current version of the ISO 8470 standard was found to be improper for the cleaning of both historical artefacts and corrosion coupons due to its inability to remove sulfide corrosion products and the risk of surface contamination and staining. A solution of 20% hydrochloric acid is the best choice for the preparation of lead coupons before exposure or for evaluation of mass loss of exposed samples because its somewhat higher corrosivity towards metallic lead is tolerable for these applications. Rochelle salt solution was found to be optimal for the cleaning of historical artefacts free of sulfide corrosion products due to the lowest corrosivity. None of these alternative solutions leave remnants on the surface and they are efficient at laboratory temperature. View Full-Text
Keywords: lead; restoration treatment; corrosion products; mass loss measurement lead; restoration treatment; corrosion products; mass loss measurement
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MDPI and ACS Style

Švadlena, J.; Prošek, T.; Strachotová, K.C.; Kouřil, M. Chemical Removal of Lead Corrosion Products. Materials 2020, 13, 5672. https://doi.org/10.3390/ma13245672

AMA Style

Švadlena J, Prošek T, Strachotová KC, Kouřil M. Chemical Removal of Lead Corrosion Products. Materials. 2020; 13(24):5672. https://doi.org/10.3390/ma13245672

Chicago/Turabian Style

Švadlena, Jan, Tomáš Prošek, Kristýna C. Strachotová, and Milan Kouřil. 2020. "Chemical Removal of Lead Corrosion Products" Materials 13, no. 24: 5672. https://doi.org/10.3390/ma13245672

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