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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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$20.00
$20.00

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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Picture for 04022 Experiences on Thermal Spray Aluminum
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04022 Experiences on Thermal Spray Aluminum (TSA) Coating for Offshore Structures

Product Number: 51300-04022-SG
ISBN: 04022 2004 CP
Author: Desmond K.K. Tiong, Shell International; Halimah Pit, Sarawak Shell Berhad
Publication Date: 2004
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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.

 
Effect of Heat Treatment Temperature on the Corrosion Protection Performance of Thermal Sprayed Aluminum Coating
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Effect of Heat Treatment Temperature on the Corrosion Protection Performance of Thermal Sprayed Aluminum Coating

Product Number: 41214-844-SG
Author: KyungJin Park, SangKyu Ryu, MyoungHo Ahn
Publication Date: 2014
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In the present study, thermal effects on the corrosion behavior and corrosion protection performance of TSA coating were investigated using various electrochemical techniques. Heat treatment at higher temperature induces more cracks in the sealer and aluminum coating. Water and corrosive species (e.g., Cl-) penetrate through the cracks, resulting in corrosion of steel substrate. 
51322-18207-SG
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Combining Thermal Spray Zinc And Hot-Dip Galvanizing To Achieve An All Metallic Zinc Coating System

Product Number: 51322-18207-SG
Author: Bernardo Duran
Publication Date: 2022
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Corrosion protection of infrastructure and assets is an area of increasing focus due to increasing financial and safety concerns. On a global scale, corrosion has an annual cost of $2.5 trillion (USD).1 To combat the deleterious effects of this natural phenomenon, specifiers and owners have many choices in terms of materials and protective coatings. Consideration of both initial and life cycle costs has become more important in the age of increased competition and shrinking maintenance budgets.  
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