Solar energy paper index
Corrosion Behavior of Plasma-Sprayed In625 Coatings Exposed to Nitrate Salts in Concentrating Solar Power Plants
One-line summary
A solar energy research paper on Corrosion Behavior of Plasma-Sprayed In625 Coatings Exposed to Nitrate Salts in Concentrating Solar Power Plants.
Engineering notes
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Chinese explanation / 中文解读
中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。
Original abstract
Abstract 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.
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