Solarthermic power plants (SPP) are an alternative energy source which uses concentrated sun-light for the production of steam which is converted to electrical power by a steam turbine. According to the high heat capacity, molten nitrates are in use for the transport of the heat from the central receiver as well as for heat storage. For the heat transport, thin walled seamless tubes are necessary. A selection of materials representing the classes of austenitic and nickel alloys as well as pure metals Fe,Cr and Ni were exposed to a KNO₃–NaNO₃ eutectic mixture in air for 1000 h at 570, 600, 640, 660 and 700 °C in order to determine the corrosion loss of the different classes of alloys and to evaluate the corrosion mechanisms. The results show that nickel is the most stable alloying element, whereas Cr, Mn and Mo are dissolved in the melt.

太阳能热电厂 (SPP) 是一种替代能源，它使用集中的阳光来生产蒸汽，蒸汽通过蒸汽轮机将其转换为电能。根据高热容量，熔融硝酸盐用于从中央接收器传输热量以及用于储热。对于热传输，薄壁无缝管是必要的。代表奥氏体和镍合金以及纯金属 Fe、Cr 和 Ni 的精选材料暴露于 KNO ₃ –NaNO ₃共晶混合物在 570、600、640、660 和 700 °C 下在空气中放置 1000 小时，以确定不同类别合金的腐蚀损失并评估腐蚀机制。结果表明，镍是最稳定的合金元素，而铬、锰和钼则溶解在熔体中。