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Thermally Sprayed Corrosion Resistant Alloy Coatings on Carbon Steel for Use in Supercritical CO? Environments

Picture for Thermally Sprayed Corrosion Resistant Alloy Coatings on Carbon Steel for Use in Supercritical CO? En
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Product Number: 51315-5939-SG
ISBN: 5939 2015 CP
Author: Shiladitya Paul
Publication Date: 2015
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This paper reports the use of a thermal spray corrosion resistant alloy (CRA) coating to mitigate corrosion of carbon steel in carbon dioxide capture plants. CRA coatings were sprayed onto carbon steel substrate and tested in 3.5wt.% NaCl solution in 100bar CO2 at 40°C for 30days. Microstructural characterisation revealed that the coating protected the steel substrate from supercritical CO2 corrosion. The bare steel formed a siderite (FeCO3) scale while no such scale was seen in the case of CRA-coated steel. It can be concluded that thermally sprayed CRA coatings provide a cost-effective corrosion mitigation method for infrastructure likely to be in contact with wet supercritical CO2. The same coatings can be used as inner lining of pipes for transport of impure CO2. However care must be taken to ensure that the thermally sprayed layer does not have any through porosity; else such coatings may accelerate corrosion of the underlying steel due to galvanic interactions.
This paper reports the use of a thermal spray corrosion resistant alloy (CRA) coating to mitigate corrosion of carbon steel in carbon dioxide capture plants. CRA coatings were sprayed onto carbon steel substrate and tested in 3.5wt.% NaCl solution in 100bar CO2 at 40°C for 30days. Microstructural characterisation revealed that the coating protected the steel substrate from supercritical CO2 corrosion. The bare steel formed a siderite (FeCO3) scale while no such scale was seen in the case of CRA-coated steel. It can be concluded that thermally sprayed CRA coatings provide a cost-effective corrosion mitigation method for infrastructure likely to be in contact with wet supercritical CO2. The same coatings can be used as inner lining of pipes for transport of impure CO2. However care must be taken to ensure that the thermally sprayed layer does not have any through porosity; else such coatings may accelerate corrosion of the underlying steel due to galvanic interactions.
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