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51314-4196-Corrosion of Cathodically Polarized TSA in Subsea Mud at High Temperature

Picture for Corrosion of Cathodically Polarized TSA in Subsea Mud at High Temperature
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Product Number: 51314-4196-SG
ISBN: 4196 2014 CP
Author: Ole Knudsen
Publication Date: 2014
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Thermally sprayed aluminium (TSA) is not immune to corrosion when polarized by sacrificial aluminium anodes. However the corrosion rate is usually rather low due to a protecting surface oxide on the TSA keeping the TSA passive. A certain cathodic reaction rate is found on the TSA producing hydroxide. This hydroxide is a potential threat to the TSA since aluminium is not passive in alkaline environments. When the TSA is exposed in seawater the hydroxide may be transported away from the TSA surface by diffusion and convection and the pH is maintained within the passive range. However in mud there is no convection and the diffusion is limited. This may result in accumulation of hydroxide at the TSA surface and activation of the TSA. The cathodic polarization may therefore result in decreased lifetime of the TSA.The paper discusses corrosion rate of TSA as function of cathodic polarization and temperature when exposed in subsea mud. 
Thermally sprayed aluminium (TSA) is not immune to corrosion when polarized by sacrificial aluminium anodes. However the corrosion rate is usually rather low due to a protecting surface oxide on the TSA keeping the TSA passive. A certain cathodic reaction rate is found on the TSA producing hydroxide. This hydroxide is a potential threat to the TSA since aluminium is not passive in alkaline environments. When the TSA is exposed in seawater the hydroxide may be transported away from the TSA surface by diffusion and convection and the pH is maintained within the passive range. However in mud there is no convection and the diffusion is limited. This may result in accumulation of hydroxide at the TSA surface and activation of the TSA. The cathodic polarization may therefore result in decreased lifetime of the TSA.The paper discusses corrosion rate of TSA as function of cathodic polarization and temperature when exposed in subsea mud. 
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Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures.  Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.

 
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Product Number: 51300-04023-SG
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