利用高温高压循环水腐蚀试验系统、原位观察高压釜以及拉曼光谱表征系统，针对SiC/SiCf复合材料开展了腐蚀试验以及原位拉曼光谱测量。水化学介质为含1 200 mg/L H₃BO₃和2 mg/L LiOH的混合水溶液。试验分为未控氧条件（O₂≈2 688 μg/L）和控氧条件（O₂≈5 μg/L）。结果表明：在500、590、715、785、805、870、915、960 cm^-1附近位置出现拉曼光谱峰，分别来自于β-SiC基体及其表面生成的SiC_<i>xO_<i>y、SiO₂、Si（OH）₄等。未控氧条件下，表面氧化膜易转变成可溶于水的Si（OH）₄，保护性差。控氧条件下，氧化膜可保持较好的稳定性，SiO₂向Si（OH）₄的转变得到有效抑制，提高了SiC/SiCf复合材料的耐蚀性。

Corrosion test and in-situ Raman spectroscopy measurement for SiC/SiCf composite were carried out using the established high temperature and high pressure circulating water corrosion test system, in-situ observation autoclave and Raman spectroscopy characterization system. The corrosion test environment was an aqueous solution containing 1 200 mg/L H₃BO₃ + 2 mg/L LiOH. Two series of corrosion experiments were conducted: in one experiment, the oxygen content in solution was not controlled (oxygen content ≈ 2 688 μg/L); in the other experiment, the oxygen content in solution was controlled (oxygen content≈5 μg/L). The results show that the Raman peaks were located near 500、590、715、785、805、870、915、960 cm^-1, corresponding to β-SiC matrix and its surface oxide films SiC_xO_y, SiO₂, Si(OH)₄ etc., respectively. In the oxygen-saturated solution, surface films were prone to become Si(OH)₄, which were not protective. In the oxygen-controlled solution, surface films were stable, and the transformation from SiO₂ to Si(OH)₄ were retarded. Therefore, the corrosion resistance of SiC/SiCf composite was improved.