Supercritical organic Rankine cycle (SORC) is considered one of the most promising candidates for producing electricity from medium- to low-temperature heat resources. Various types of alloys are considered potential materials for constructing the main SORC components. The decomposition of a working fluid, R-1234ze(E) (trans-1,3,3,3-tetrafluoropropane), in the high-temperature region of the SORC loop produces hydrogen fluoride (HF), which affects the stability of the alloys. In this work, the corrosion behavior of seven selected materials under supercritical R-1234ze(E) conditions was examined. In the turbine inlet region of the designed SORC loop (180 °C, 5 MPa), the formation of a thick scale layer (10–40 nm) and penetration of F in the subsurface region were observed in the SS304 and SS316 samples after seven days of exposure. In the case of copper and bronze, the erosion of the surface and hole formation at the bulk phase were caused by the deep penetration of HF. In contrast, SS630 and Inconel 718 exhibited excellent corrosion stability without changing the chemical environment of their subsurface regions. In the case of Al6061, preferential segregation of the MgF₂ layer in the subsurface region was observed.

超临界有机朗肯循环（SORC）被认为是从中到低温热资源发电的最有希望的候选者之一。各种合金被认为是构成主要SORC组件的潜在材料。的工作流体，的R-1234ze（E）的分解（反式-1,3,3,3-四氟丙烷）在SORC回路的高温区域会产生氟化氢（HF），这会影响合金的稳定性。在这项工作中，检查了七种选定材料在超临界R-1234ze（E）条件下的腐蚀行为。在设计的SORC回路的涡轮机进气口区域（180°C，5 MPa）中，经过七次搅拌后，在SS304和SS316样品中观察到了厚垢层的形成（10–40 nm）和F在地下区域的渗透。接触天数。在铜和青铜的情况下，本体相表面的腐蚀和孔的形成是由HF的深度渗透引起的。相反，SS630和Inconel 718表现出出色的腐蚀稳定性，而不会改变其次表面区域的化学环境。对于Al6061，在地下区域观察到₂层。