Inhibition of Copper Pitting Corrosion in Aggressive Potable Waters

Sarver, Emily A.; Edwards, Marc A.

Inhibition of Copper Pitting Corrosion in Aggressive Potable Waters

dc.contributor.author	Sarver, Emily A.	en
dc.contributor.author	Edwards, Marc A.	en
dc.contributor.department	Mining and Minerals Engineering	en
dc.date.accessioned	2017-09-18T09:49:09Z	en
dc.date.available	2017-09-18T09:49:09Z	en
dc.date.issued	2012-08-21	en
dc.date.updated	2017-09-18T09:49:09Z	en
dc.description.abstract	Copper pitting corrosion can lead to premature plumbing failures, and can be caused by aggressive potable waters characterized by high pH, free chlorine residual and low alkalinity. In such waters and under continuous flow, certain inhibitors including phosphate, silica or natural organic matter may greatly reduce pitting occurrence. In the current work, 1 mg/L phosphate (as P) completely prevented initiation of pits, and 5 mg/L silica (as Si) significantly decelerated pitting. However, much lower doses of these inhibitors had little benefit and actually accelerated the rate of attack in some cases. Effects of organic matter were dependent on both the type (e.g., natural versus ozonated humic substances) and dosage. Dose-response effects of free chlorine and alkalinity were also investigated. Based on electrochemical data, pits initiated more rapidly with increased free chlorine, but even moderate levels of chlorine (~0.4 mg/L) eventually caused severe pitting. High alkalinity decreased pit propagation rates but did not prevent pit formation.	en
dc.description.version	Published version	en
dc.format.mimetype	application/pdf	en
dc.identifier.citation	Emily Sarver and Marc Edwards, “Inhibition of Copper Pitting Corrosion in Aggressive Potable Waters,” International Journal of Corrosion, vol. 2012, Article ID 857823, 16 pages, 2012. doi:10.1155/2012/857823	en
dc.identifier.doi	https://doi.org/10.1155/2012/857823	en
dc.identifier.uri	http://hdl.handle.net/10919/79003	en
dc.language.iso	en	en
dc.publisher	Hindawi	en
dc.rights	Creative Commons Attribution 4.0 International	en
dc.rights.holder	Copyright © 2012 Emily Sarver and Marc Edwards. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.	en
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	en
dc.title	Inhibition of Copper Pitting Corrosion in Aggressive Potable Waters	en
dc.title.serial	International Journal of Corrosion	en
dc.type	Article - Refereed	en
dc.type.dcmitype	Text	en