The effect of thermal shock temperatures of 1000 °C, 1100 °C, 1200 °C and 1300 °C on the microstructure evolution and adhesion properties of thick Cr coatings on Zr-4 alloy substrates are systematically studied. The results show that the Cr coating has excellent thermal shock resistance even at 1300 °C and still adheres well to the substrate after the thermal shock tests. The main reasons for the degradation of coating properties are the severe diffusion and migration of Cr and Zr at near-eutectic temperatures, while the formation of pores on the Cr₂O₃ layer may be related to the evaporation of volatile CrO₂(OH)₂ at the grain boundaries of the Cr₂O₃ oxides. In addition, the microstructural evolution of thick Cr coatings is also discussed in detail.

系统研究了热冲击温度1000°C，1100°C，1200°C和1300°C对Zr-4合金基体上厚Cr涂层的组织演变和附着性能的影响。结果表明，即使在1300°C时Cr涂层也具有出色的抗热震性，并且在热冲击试验后仍能很好地粘附在基材上。镀层性能下降的主要原因是在近共晶温度下Cr和Zr的严重扩散和迁移，而Cr ₂ O ₃层上孔的形成可能与挥发性CrO ₂（OH）的蒸发有关。₂在Cr ₂ O ₃的晶界处氧化物。此外，还详细讨论了厚铬涂层的微观组织演变。