Inconel690在 ETA/N H3水化学环境中的均匀腐蚀行为研究

摘要

The general corrosion behaviors of Inconel690 for steam generator (SG) tube were studied in the simulation environment of secondary loop of pressurized water reac‐tor (PWR) with ethanolamine (ETA) and ammonia (NH3 ) separately .After exposed to the simulation environment with ETA for 5 000 hours , the weight loss rate of Inconel690 is 0.21 mg/(m2 · h) .But for the tests under the NH3 environment after 5 000 hours ,the weight loss rate of Inconel690 is 0.50 mg/(m2 · h) .In addition ,there is more chromium in the oxidation film formed in the simulation environment with ETA ,and the oxidation film is more protective .The results show that Inconel690 is more resistant to general corrosion in the environment with ETA than that in the envi‐ronment with NH3 .%本文在模拟压水堆二回路的高温高压水化学环境下，研究了蒸汽发生器传热管材料镍基合金Inconel690试样在乙醇胺（ETA）和氨（NH3）水化学环境中的均匀腐蚀行为。结果显示：在5000 h均匀腐蚀试验后，ETA水化学环境下试样的均匀腐蚀速率为0.21 mg／（m2· h），NH3水化学环境下试样的均匀腐蚀速率为0.50 mg／（m2· h）；在ETA水化学环境下试样表面形成的氧化膜中铬含量更高，氧化膜的保护性更好。以上结果表明，Inconel690在ET A水化学环境下的耐蚀性强于N H3水化学环境。