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Performance of Thermally Sprayed Corrosion Resistant Alloy (CRA) Coatings in 50MPa Supercritical CO2

Picture for Performance of Thermally Sprayed Corrosion Resistant Alloy (CRA) Coatings in 50MPa Supercritical CO2
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This paper reports the performance of HVOF-sprayed corrosion resistant alloy (CRA) coatings in an aqueous solution bubbled with 50MPa supercritical CO2.

Product Number: 51317--9007-SG
ISBN: 9007 2017 CP
Author: Shiladitya Paul
Publication Date: 2017
Industry: Coatings and Linings
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This paper reports the performance of HVOF-sprayed corrosion resistant alloy (CRA) coatings in an aqueous solution bubbled with 50MPa supercritical CO2. 316L stainless steel alloy C-276 and alloy 625 were procured in power form and sprayed onto carbon steel with a JP500 HVOF system and 8 mm holidays were drilled in the coating to expose the steel substrate. These were then exposed to 3.5 wt.% NaCl solution for 30 days bubbled with 50MPa CO2. Tests were conducted at 40°C. Post-test microstructural characterization revealed that the coatings protected the steel substrate from CO2 corrosion when intact. The bare steel in the exposed region formed a siderite scale while no such scale was seen in the undamaged regions. The substrate close to the coating showed accelerated corrosion due to galvanic effects. It can be concluded that thermally sprayed CRA coatings are a candidate to provide cost-effective corrosion mitigation in wet supercritical CO2. However care must be taken to ensure that the thermally sprayed CRA layer does not have any through porosity or damage; else such coatings may accelerate corrosion of the underlying steel due to galvanic interactions.

Keywords: Supercritical CO2, Corrosion resistant coatings, Thermal spray coatings, HVOF Coatings, igh pressure CO2, Dense Phase CO2

This paper reports the performance of HVOF-sprayed corrosion resistant alloy (CRA) coatings in an aqueous solution bubbled with 50MPa supercritical CO2. 316L stainless steel alloy C-276 and alloy 625 were procured in power form and sprayed onto carbon steel with a JP500 HVOF system and 8 mm holidays were drilled in the coating to expose the steel substrate. These were then exposed to 3.5 wt.% NaCl solution for 30 days bubbled with 50MPa CO2. Tests were conducted at 40°C. Post-test microstructural characterization revealed that the coatings protected the steel substrate from CO2 corrosion when intact. The bare steel in the exposed region formed a siderite scale while no such scale was seen in the undamaged regions. The substrate close to the coating showed accelerated corrosion due to galvanic effects. It can be concluded that thermally sprayed CRA coatings are a candidate to provide cost-effective corrosion mitigation in wet supercritical CO2. However care must be taken to ensure that the thermally sprayed CRA layer does not have any through porosity or damage; else such coatings may accelerate corrosion of the underlying steel due to galvanic interactions.

Keywords: Supercritical CO2, Corrosion resistant coatings, Thermal spray coatings, HVOF Coatings, igh pressure CO2, Dense Phase CO2

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