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Title: Effect of seawater constituents on the performance of thermal spray aluminum in marine environments
Authors: Echaniz, Rosa G.
Paul, Shiladitya
Thornton, Rob
First Published: 26-Mar-2019
Publisher: Wiley, DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V.
Citation: Materials and Corrosion, 2019, 70(6), pp. 996-1004
Abstract: Thermally sprayed coatings are often used to mitigate corrosion of offshore structures. They act as a physical barrier to the aggressive marine environment and as a sacrificial distributed anode for low carbon steel. In such environments, the severity of material degradation depends on many factors. The effect of temperature, exposure time or the presence of micro-organisms are the focus of many studies, for example, however, the effect of the different ions present in seawater remains largely unexplored. The chemical composition of the water changes considerably depending on the location; industrial, glacial, estuarine, and so forth. In addition, when thermal spray aluminum (TSA) protects steel in seawater, calcareous matter precipitates as a result of the cathodic polarization and subsequent localized increase in pH. Therefore, understanding how ions such as magnesium (II), calcium (II), or carbonates alter the coating properties in the marine environment is important. This paper reports the experimental work carried out with TSA-coated steel samples with defects to simulate mechanical damage or erosion of the coating. The combination of electrochemical tests and surface characterization provided evidence of the efficiency of the calcareous bilayer that forms on top of steel reducing the TSA degradation.
DOI Link: 10.1002/maco.201810764
ISSN: 0947-5117
eISSN: 1521-4176
Version: Publisher Version
Status: Peer-reviewed
Type: Conference Paper
Rights: Copyright © the authors, 2019. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Description: Raw data relating to this study is available at
Appears in Collections:Published Articles, Dept. of Engineering

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