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Evaluation of Coatings to Improve Steel Compatibility in Supercritical CO2

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Supercritical CO2 (sCO2) has many attractive features as a working fluid including its low critical point (31°C/73.8 bar) and the reduced work of compression compared to an ideal gas. Thus, it is being explored for many different applications including fossil, nuclear, geothermal, concentrating solar power (CSP) and waste heat recovery. However, CO2 environments are known to carburize steels6-20 which limits their usage to lower temperatures (450°C21 for 9%Cr steels) than in steam boilers.

Product Number: 51323-19207-SG
Author: B. A. Pint, R. Pillai, J. R. Keiser
Publication Date: 2023
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The use of a direct-fired supercritical CO2 (sCO2) power Allam cycle could revolutionize fossil energy as a low-emission power source. However, the carburizing sCO2 environment may limit the use of lower cost steels in the lower temperature portions of the plant because of concerns about embrittlement. Initial studies on representative ferritic-martensitic (FM) steels and conventional and advanced austenitic steels at 450-650°C in 300 bar (30 MPa) sCO2 with and without 1%O2 and 0.1%H2O additions have indicated that sCO2 environments will have lower maximum operating temperatures compared to steam plants. In this study, pack coated steels were evaluated including chromizing and aluminizing. Initial 500-1000 h results showed some benefit of coating especially for the Cr coatings at 600° and 650°C. Characterization included measuring the post-exposure room temperature tensile properties to assess the coating effect on embrittlement typically associated with carbon ingress.

The use of a direct-fired supercritical CO2 (sCO2) power Allam cycle could revolutionize fossil energy as a low-emission power source. However, the carburizing sCO2 environment may limit the use of lower cost steels in the lower temperature portions of the plant because of concerns about embrittlement. Initial studies on representative ferritic-martensitic (FM) steels and conventional and advanced austenitic steels at 450-650°C in 300 bar (30 MPa) sCO2 with and without 1%O2 and 0.1%H2O additions have indicated that sCO2 environments will have lower maximum operating temperatures compared to steam plants. In this study, pack coated steels were evaluated including chromizing and aluminizing. Initial 500-1000 h results showed some benefit of coating especially for the Cr coatings at 600° and 650°C. Characterization included measuring the post-exposure room temperature tensile properties to assess the coating effect on embrittlement typically associated with carbon ingress.

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(Insulation & Corrosion) Insulative Coatings - Fit for Purpose

Product Number: 17-COAT_DEC21
Author: Arin Shahmoradian
Publication Date: 2021
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Corrosion Under Insulation (CUI) is a very serious problem impacting the oil and gas, petrochemical, power and heavy industries. Due to the high costs associated with CUI, many industries have begun abandoning conventional jacket insulation. Recent advancements in trade association standards have helped engineers select, apply and inspect different types of insulative coatings in lieu of conventional jacket insulation.
Picture for A comparison among different electrochemical hydrogen charging methods tested on low alloy steels
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A comparison among different electrochemical hydrogen charging methods tested on low alloy steels

Product Number: 51323-18866-SG
Author: Luca Paterlini, Luca Casanova, Giorgio Re, Marco Ormellese, Fabio Bolzoni
Publication Date: 2023
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Atomic hydrogen can enter metallic microstructures from deposition processes like Cr plating or phosphatizing, chemical and electrochemical pickling treatments, during welding operations if the humidity of consumables is too high, by cathodic processes resulting from corrosion phenomena or contact with high pressure gaseous hydrogen. According to different chemical-physical mechanisms, atomic hydrogen can enter the metallic structure resulting in damages of various forms, such as HIC (hydrogen induced cracking), SOHIC (stress oriented HIC), delayed fracture and hydrogen embrittlement (HE).
Picture for Localized corrosion propagation of carbon steel in inhibited environment: a potentiostatic approach
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Localized corrosion propagation of carbon steel in inhibited environment: a potentiostatic approach

Product Number: 51323-19071-SG
Author: Bernardo Santos, Marc Singer, Maria Serenario, Maalek Mohamed-Said, Xi Wang, Alysson Helton Santos Bueno, David Young
Publication Date: 2023
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Localized corrosion is known as the most dangerous and unpredictable corrosion mechanisms found in hydrocarbon production and transmission systems. This mode of corrosion has the potential to cause serious financial loss, environmental damage, production interruption, and even loss of life. Over the years, corrosion engineers have made significant improvements on prediction and mitigation techniques to extend the lifespan of carbon steel pipelines, such as using of corrosion inhibitors; injection of such chemicals has proven to be effective and economic, making them a first choice over other alternatives
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