Effect of Corrosion Products and Deposits on the Damage Tolerance of TSA-Coated Steel in Artificial Seawater

Castro-Vargas, Adriana; Gill, S.P.A.; Paul, Shiladitya

doi:10.3390/surfaces5010005

Cited by 4 publications

(2 citation statements)

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“…EIS also allows better understanding the corrosion mechanism once a suitable electrical equivalent model has been identified [44]. Modelling work is also considered beneficial in theoretically looking at the possible mechanisms [33]. It also allows one to carry out 'simulated' experiments without the expense and time constraints.…”

Section: Limitations and Further Developmentmentioning

confidence: 99%

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Effect of Damage on the Corrosion Performance of Thermal Spray Aluminium (TSA) Coating in Synthetic Seawater

Paul

2023

Applied Sciences

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A widely used coating system for corrosion mitigation of offshore steel structures is thermally sprayed aluminium (TSA). Even though these coatings have been used for decades, it is not always clear how they perform in service over long periods, particularly if damaged during installation or in service. To understand the corrosion behaviour of damaged TSA coatings in seawater and their tolerance to levels of damage, TSA coatings (1050 Al) were prepared on carbon steel substrates using wire arc spray and tested in synthetic seawater. Prior to testing, various levels of holidays or damage (~5%, 10%, 15% and 18%) reaching the steel substrate were drilled on the front surface of the coated specimens. Open circuit potential was measured and linear polarization resistance technique was used to calculate the corrosion rate. The work showed that the TSA coatings polarised steel to potentials below −800 mV (Ag/AgCl) at 25 °C, even in the presence of damage or holiday (up to ~18%). The SEM/EDX and XRD data confirmed the presence of brucite and aragonite in the damage region. The presence of damage impacted the short-term corrosion rate at the start, but did not significantly affect the overall corrosion performance of the TSA coatings in 420 days of testing.

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Section: Limitations and Further Developmentmentioning

confidence: 99%

“…Even the modelling work on TSA with damage has focused on simple 'single' damage area [33]. The lack of detailed work on the effect of damage was also highlighted in the review on TSA by Syrek-Gerstenkorn et al [4].…”

Section: Introductionmentioning

confidence: 99%