Encinas-Sánchez V, Macías-García A, de Miguel M T, Pérez F J, Rodríguez-Rego J M
Surface Engineering and Nanostructured Materials Research Group, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain.
Department of Mechanical, Energetic and Materials Engineering, School of Industrial Engineering, University of Extremadura, Avda. de Elvas, s/n, 06006 Badajoz, Spain.
Materials (Basel). 2023 Jan 5;16(2):546. doi: 10.3390/ma16020546.
The protective behaviour of ZrO-3%molYO sol-gel coatings, deposited with an immersion coating technique on 9Cr-1Mo P91 steel, was evaluated with corrosion monitoring sensors using the electrochemical impedance spectroscopy technique. The tests were carried out in contact with solar salt at 500 °C for a maximum of 2000 h. The results showed the highly protective behaviour of the coating, with the corrosion process in the coated system being controlled by the diffusion of charged particles through the protective layer. The coating acts by limiting the transport of ions and slowing down the corrosive process. The system allowed a reduction in the corrosion rate of uncoated P91 steel. The estimated corrosion rate of 22.62 μm·year is lower than that accepted for in-service operations. The proposed ZrO-3%molYO sol-gel coatings are an option to mitigate the corrosion processes caused by the molten salts in concentrated solar power plants.
采用浸没涂覆技术在9Cr-1Mo P91钢上沉积的ZrO-3%molYO溶胶-凝胶涂层的防护行为，使用电化学阻抗谱技术通过腐蚀监测传感器进行了评估。测试在500℃下与太阳能盐接触进行，最长持续2000小时。结果表明该涂层具有高度防护性能，涂层体系中的腐蚀过程由带电粒子通过保护层的扩散控制。该涂层通过限制离子传输和减缓腐蚀过程起作用。该体系使未涂覆的P91钢的腐蚀速率降低。估计的腐蚀速率为22.62μm·年，低于服役运行所允许的速率。所提出的ZrO-3%molYO溶胶-凝胶涂层是减轻聚光太阳能发电厂中熔盐引起的腐蚀过程的一种选择。
