【作者】 李昊翔； 郑伟； 杜斌； 银华强； 何学东； 马涛； 杨星团；

【Author】 LI Hao-xiang;ZHENG Wei;DU Bin;YIN Hua-qiang;HE Xue-dong;MA Tao;YANG Xing-tuan;Institute of Nuclear and New Energy Technology,Tsinghua University;

【机构】 清华大学核能与新能源技术研究院；

【摘要】 Incoloy 800H合金是高温气冷堆蒸汽发生器传热管备选材料之一。本项工作对其在空气侵入事件下循环流动的两种氧气含量差异较大气氛下的腐蚀行为展开研究。搭建配气式高温合金腐蚀实验台架开展多组时间长度不同的氧化实验,结合合金氧化动力学理论计算了合金的抛物线速率常数k_p,并利用电子天平、SEM、EDS、XRD以及气相色谱仪等测试手段进行了讨论分析。结果表明:氧气浓度的大幅变化并不是影响合金氧化程度的重要因素。在发生空气侵入事件后,Incoloy 800H合金在低和高氧浓度气氛下合金均出现明显的氧化腐蚀行为。两种气氛下合金的质量增重类似,抛物线速率常数k_p值十分接近,氧化层厚度接近,合金发生非常类似的氧化行为。更多还原

【Abstract】 Incoloy 800 H alloy is one of the alternative materials for heat transfer tube of steam generator of high temperature gas-cooled reactor(HTGR).In this work,the corrosion behavior of the two kinds of atmosphere with large difference in oxygen content circulating under the air ingress accident was studied.A gas distribution type superalloy corrosion test bench was built to carry out several groups of oxidation experiments with different time lengths.The parabolic rate constant kp of the alloy was calculated based on the theory of alloy oxidation kinetics.The experimental alloy was discussed and analyzed by means of electronic balance,SEM,EDS,XRD and gas chromatograph.The results show that the large change of oxygen concentration is not an important factor affecting the corrosion degree of the alloy.After the air ingress accident,the Incoloy 800 H alloy showed obvious oxidation corrosion behavior under low and high oxygen concentration atmosphere.The mass gain of the alloy in the two atmospheres is similar,and the parabolic rate constant k_p value is very close,the thickness of oxide layer is close,and the alloy has very similar oxidation behavior.更多还原