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Protection of Deep Sea Steel Structures Using Thermally Sprayed Aluminium

Reports the corrosion performance of damaged thermally sprayed aluminium in a simulated deep sea environment. Detailed microstructural characterisation of the calcareous deposit confirmed the formation of protective Mg-based layers.

Product Number: 51317--9009-SG
ISBN: 9009 2017 CP
Author: Shiladitya Paul
Publication Date: 2017
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Thermally sprayed aluminium (TSA) has been used in offshore applications 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 when damaged. Furthermore data on the performance of damaged TSA in deep sea is virtually non-existent. The paper addresses these knowledge gaps and reports the corrosion performance of damaged TSA in a simulated deep sea environment. Holidays amounting to 3% of the sample area were drilled to expose the underlying carbon steel and the sample was exposed to synthetic seawater at 5°C in an autoclave at 50MPa to simulate 5000m of water pressure. After testing examination of the sample revealed the formation of calcareous deposit on the exposed steel surface with no visible steel corrosion product. Detailed microstructural characterisation of the calcareous deposit confirmed the formation of protective Mg-based layers. Thus one can conclude that TSA can protect carbon steel in deep sea environment even when damaged. 

Keywords: TSA, calcareous deposit, thermal spray coatings, deep sea, marine corrosion.

 

Thermally sprayed aluminium (TSA) has been used in offshore applications 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 when damaged. Furthermore data on the performance of damaged TSA in deep sea is virtually non-existent. The paper addresses these knowledge gaps and reports the corrosion performance of damaged TSA in a simulated deep sea environment. Holidays amounting to 3% of the sample area were drilled to expose the underlying carbon steel and the sample was exposed to synthetic seawater at 5°C in an autoclave at 50MPa to simulate 5000m of water pressure. After testing examination of the sample revealed the formation of calcareous deposit on the exposed steel surface with no visible steel corrosion product. Detailed microstructural characterisation of the calcareous deposit confirmed the formation of protective Mg-based layers. Thus one can conclude that TSA can protect carbon steel in deep sea environment even when damaged. 

Keywords: TSA, calcareous deposit, thermal spray coatings, deep sea, marine corrosion.

 

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