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<p>Thermal energy storage (TES) systems store the energy from solar radiation in a thermal fluid making the electricity produced by Concentrating Solar Power (CSP) plants dispatchable. The operative temperatures of the thermal fluids, usually synthetic oils or molten salts, ranging from 500 up to 800&#xa0;°C are not compatible with the common construction materials used in CSP components. A viable approach to mitigate corrosion in TES components involves coating the carbon steel with high-resistant materials. In the present work, the behavior of Inconel 625 coatings deposited on T22 carbon steel by Compact Plasma Spray against nitrate salts was investigated. Corrosion tests of coated samples in eutectic nitrate mixture were conducted at 500&#xa0;°C for 24, 72, 168, 336, and 504 hours. After 24 hours, In625 showed the formation of a thin layer of corrosion products localized only on the sample surface. Longer exposition produced a more pronounced coating degradation with the spreading of corrosion products through the thickness, which reached the coating/substrate interface after 500 hours of exposition. The corrosion rate of coating reached 0.4&#xa0;mm/year due to the low cohesion of the sprayed splats.</p>

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Corrosion Behavior of Plasma-Sprayed In625 Coatings Exposed to Nitrate Salts in Concentrating Solar Power Plants

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Felice Rubino,
  • Vitantonio Esperto,
  • Claudio Munez,
  • Pedro Poza

摘要

Thermal energy storage (TES) systems store the energy from solar radiation in a thermal fluid making the electricity produced by Concentrating Solar Power (CSP) plants dispatchable. The operative temperatures of the thermal fluids, usually synthetic oils or molten salts, ranging from 500 up to 800 °C are not compatible with the common construction materials used in CSP components. A viable approach to mitigate corrosion in TES components involves coating the carbon steel with high-resistant materials. In the present work, the behavior of Inconel 625 coatings deposited on T22 carbon steel by Compact Plasma Spray against nitrate salts was investigated. Corrosion tests of coated samples in eutectic nitrate mixture were conducted at 500 °C for 24, 72, 168, 336, and 504 hours. After 24 hours, In625 showed the formation of a thin layer of corrosion products localized only on the sample surface. Longer exposition produced a more pronounced coating degradation with the spreading of corrosion products through the thickness, which reached the coating/substrate interface after 500 hours of exposition. The corrosion rate of coating reached 0.4 mm/year due to the low cohesion of the sprayed splats.