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Properties of TSA in natural seawater at ambient and elevated temperature
Author(s) -
Wilson Havard,
Johnsen Roy,
Rodriguez Cristian T.,
Hesjevik Sven M.
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810385
Subject(s) - seawater , coating , cathodic protection , corrosion , materials science , dissolution , aluminium , metallurgy , atmospheric temperature range , electrochemistry , mineralogy , chemistry , composite material , geology , meteorology , electrode , oceanography , physics
Electrochemical properties of thermal sprayed aluminium (TSA) coating were investigated in natural seawater at elevated temperatures with and without cathodic protection (CP). TSA has a low current density requirement when connected to a CP system, regardless of temperature. The corrosion rates for TSA were found to be low both under CP and at open circuit potential at temperatures in the range 20–90 °C. However, measurements of the TSA coating thickness before and after exposure indicate there might be chemical dissolution of the coating. However, this has not been reported anywhere else in the literature, so more data is necessary to conclude. Post exposure analysis indicated calcareous deposits on the TSA exposed for up to 280 days. In SEM small amounts were found, and the type of deposits were dependent on temperature, with the deposits being more based on Mg at higher temperatures.