The protective effect of NiCr coating in supercritical water (SCW) was studied in this work. NiCr coated 316 L stainless steel showed an excellent microstructure and performance stability in SCW. The corrosion weight gains of as-received 316L were 2–3.6 times of that of NiCr coated sample in SCW with 5000 ppm oxygen content. The coating greatly reduced the corrosion weight gain of 316L in a SCW environment after 144 h exposure. The surface of NiCr coating was composed of the outermost hydration layer (Ni(OH)₂), oxide layer (NiO, NiCr₂O₄ and Cr₂O₃) and metallic layer (Ni⁰) mixed in oxides. NiO on the surface of the NiCr coating decomposed with the addition of oxygen or chloride ions in SCW.

本工作研究了镍铬涂层在超临界水（SCW）中的保护作用。Ni Cr 涂层 316 L 不锈钢在 SCW 中表现出优异的微观结构和性能稳定性。在含氧量为 5000 ppm 的 SCW 中，收到的 316L 的腐蚀增重是镍铬涂层样品的2-3.6 倍。该涂层大大降低了 316L 在 SCW 环境中暴露 144 小时后的腐蚀增重。NiCr涂层的表面由最外层的水化层(Ni(OH) ₂ )、氧化层(NiO、NiCr ₂ O ₄和Cr ₂ O ₃ )和混合在氧化物中的金属层(Ni ⁰ )组成。Ni表面的NiO在 SCW 中加入氧或氯离子会分解 Cr 涂层。