Corrosion is an important issue in high-temperature applications such as Concentrated Solar Power (CSP) technology, playing a crucial role in the long-term use of storage tanks, heat exchanger and piping materials which account for a considerable component of the investment costs. While there are many studies regarding the corrosion rates of container materials under the conditions of CSP, there is little progress in the field of their degradation prevention by anticorrosion methods. This work presents an analysis of the corrosion mechanisms between the most economical construction material—carbon steel—and molten nitrate salt. A method to protect the carbon steel against corrosion by molten salt at high temperature was proposed, involving the formation of a calcium carbonate layer on the carbon steel surface. The stability of the layer was tested under isothermal and temperature cycling conditions up to 500 °C, in both inert and air atmospheres in the presence or absence of humidity. The protection method proposed has potential to reduce investment costs for CSP technology.

在诸如聚光太阳能（CSP）技术之类的高温应用中，腐蚀是一个重要问题，它在长期使用储罐，热交换器和管道材料中起着至关重要的作用，这些投资构成了相当大的投资成本。尽管有许多关于在CSP条件下容器材料的腐蚀速率的研究，但是在通过防腐蚀方法防止其降解的领域中几乎没有进展。这项工作对最经济的建筑材料碳钢和熔融硝酸盐之间的腐蚀机理进行了分析。提出了一种防止碳钢在高温下受到熔融盐腐蚀的方法，该方法包括在碳钢表面上形成碳酸钙层。在高达500°C的等温和温度循环条件下，在有或没有湿气的惰性和空气气氛下，测试层的稳定性。提出的保护方法有可能降低CSP技术的投资成本。