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Behaviour of Damaged Thermally Sprayed Aluminium (TSA) in Aerated and Deaerated Seawater

Thermally sprayed aluminium (TSA) has been used in offshore oil and gas infrastructure for decades. Their effectiveness in mitigating corrosion of steel structures in presence of seawater has been proven over the years. However very little work is reported on the performance of TSA in other sectors where conditions are different and damage of such coatings is more likely such as monopoles of offshore wind turbines. Furthermore data on the performance of damaged TSA in conditions with limited dissolved oxygen such as in internal walls of monopiles is scarce. This paper addresses these knowledge gaps and reports the corrosion performance of damaged TSA in a simulated marine environment both in the presence and absence of dissolved oxygen. Holidays amounting to 3% of the sample area were drilled to expose the underlying carbon steel and the samples were exposed to synthetic seawater at 25°C. After testing examination of the sample revealed the formation of calcareous deposit in aerated condition on the exposed steel surface with no visible steel corrosion product. In the deaerated condition Mg-containing layers were formed on the exposed steel surface. Detailed microstructural characterisation of the deposit confirmed the formation of protective Ca- and Mg-based layers in different conditions. Thus one can conclude from this preliminary study that TSAhas the ability toprotect carbon steel in both aerated and deaerated seawater.

Product Number: 51319-12766-SG
Author: Shiladitya Paul
Publication Date: 2019
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