Impact of Galvanic Anode Dissolution on Metal Trace Element Concentrations in Marine Waters

Type Article
Date 2015-12
Language English
Author(s) Deborde Jonathan1, Refait Philippe2, Bustamante Paco3, Caplat Christelle4, Basuyaux Olivier5, Grolleau Anne-Marie6, Mahaut Marie-Laure7, Brach-Papa Christophe8, Gonzalez Jean-Louis9, Pineau Samuel1
Affiliation(s) 1 : ACCOAST, Espace Atlantis, F-56610 Arradon, France.
2 : Univ La Rochelle, UMR CNRS 7356, Lab Sci Ingn Environm LaSIE, F-17042 La Rochelle 01, France.
3 : Univ La Rochelle, UMR CNRS 7266, Littoral Environm & Soc LIENSs, F-17000 La Rochelle, France.
4 : Normandie Univ, UPMC, MNHN,UCBN,IRD 207, Biol ORganismes & Ecosyst Aquat,UMR BOREA CNRS 72, F-50130 Octeville, France.
5 : SMEL, Ctr Expt, ZAC Blainville, F-50560 Blainville Sur Mer, France.
6 : DCNS Res, F-50104 Octeville, France.
7 : CNAM INTECHMER, F-50103 Cherbourg, France.
8 : IFREMER, Ctr Atlantique, Unite Biogeochim & Ecotoxicol, F-44311 Nantes 03, France.
9 : IFREMER, Ctr Mediterranee, Lab Biogeochim Contaminants Metall, F-83507 La Seyne Sur Mer, France.
Source Water Air And Soil Pollution (0049-6979) (Springer), 2015-12 , Vol. 226 , N. 12 , P. 423:1-14
DOI 10.1007/s11270-015-2694-x
WOS© Times Cited 5
Keyword(s) Galvanic anode, Aluminum, Zinc, Metal transfer, Seawater
Abstract Submerged harbor steel structures often employ cathodic protection using galvanic anodes to guard against corrosion. A laboratory experiment, with three different cathodic protection configurations by galvanic aluminum-based anodes, was performed to evaluate the potential metal transfer from the anodic alloy dissolution into the surrounding marine water. The anode dissolution rate is proportional to the imposed current demands and induced a significant Al, In, and Zn transfer in the dissolved and particulate fractions of the corrosion product layers covering the anode surface. These layers were poorly adherent, even under low hydrodynamic conditions. Consequently, at the anode vicinity, the suspended particle matter and dissolved fraction of surrounding marine waters showed strong enrichments in Al and Zn, respectively, the values of which could potentially affect the adjacent biota. After the anode activation period, however, the metal inputs from galvanic anode dissolution are rapidly diluted by seawater renewal. At regional scale, these metal fluxes should be negligible compared to river and wastewater fluxes. These results also showed that it is difficult to assess the impact of the anode dissolution on the concentrations of metals in the natural environment, especially for metals included in trace amounts in the anode alloy (i.e., Cu, Fe, In, Mn, and Si) in the aquatic compartment.
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Deborde Jonathan, Refait Philippe, Bustamante Paco, Caplat Christelle, Basuyaux Olivier, Grolleau Anne-Marie, Mahaut Marie-Laure, Brach-Papa Christophe, Gonzalez Jean-Louis, Pineau Samuel (2015). Impact of Galvanic Anode Dissolution on Metal Trace Element Concentrations in Marine Waters. Water Air And Soil Pollution, 226(12), 423:1-14. Publisher's official version : https://doi.org/10.1007/s11270-015-2694-x , Open Access version : https://archimer.ifremer.fr/doc/00302/41328/