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Simulation Of The Damage Tolerance Of Thermal Spray Aluminium Sacrificial Coating In Artificial Seawater

Picture for Simulation Of The Damage Tolerance Of Thermal Spray Aluminium Sacrificial Coating In Artificial Seawater
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TSA is mainly used to protect offshore steel structures, including atmospheric, splash and immersed zones. During installation or in service, the coating is likely to be damaged due to erosion, wear, scratch etc. TSA coatings protect by acting as a barrier and offering cathodic protection even if the substrate is exposed to seawater.

Product Number: 51322-17641-SG
Author: Adriana Castro Vargas, Shiladitya Paul
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Numerical simulations were conducted to understand the behaviour of sacrificial aluminium coatings obtained by arc spray with varying areas of damage and its capacity to polarise the steel under a simulated marine environment. The damage tolerance of a 300 μm thick coating of aluminium alloy AA 1050 (TSA) with 5%, 20%, 50% and 90% exposed steel surfaces was evaluated in a time-dependent model. Arbitrary Lagrangian Eulerian (ALE) was used in a moving mesh technique to simulate the consumption of the TSA coating surface. Cathode surface, in this case, exposed steel, is assumed non-deforming in the model. The simulations were compared with experimental measurements of open circuit potential (OCP) and corrosion rate (CR) from previous studies, where the electrochemical behaviour of TSA with exposed steel surface was evaluated over different periods of time in artificial seawater at 20°C. The corrosion rates obtained using the model are in broad agreement with those estimated from laboratory experiments. In addition, the model predicted sacrificial protection offered by TSA coating as a function of the exposed steel.

Numerical simulations were conducted to understand the behaviour of sacrificial aluminium coatings obtained by arc spray with varying areas of damage and its capacity to polarise the steel under a simulated marine environment. The damage tolerance of a 300 μm thick coating of aluminium alloy AA 1050 (TSA) with 5%, 20%, 50% and 90% exposed steel surfaces was evaluated in a time-dependent model. Arbitrary Lagrangian Eulerian (ALE) was used in a moving mesh technique to simulate the consumption of the TSA coating surface. Cathode surface, in this case, exposed steel, is assumed non-deforming in the model. The simulations were compared with experimental measurements of open circuit potential (OCP) and corrosion rate (CR) from previous studies, where the electrochemical behaviour of TSA with exposed steel surface was evaluated over different periods of time in artificial seawater at 20°C. The corrosion rates obtained using the model are in broad agreement with those estimated from laboratory experiments. In addition, the model predicted sacrificial protection offered by TSA coating as a function of the exposed steel.

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