| Ni-xCr-6.8Al基合金热腐蚀行为 |
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| 引用本文： | 韩朝,刘咏,王岩,李维杰,汤慧萍.Ni-xCr-6.8Al基合金热腐蚀行为[J].中国有色金属学会会刊,2011,21(11):2348-2357. |
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| 作者姓名： | 韩朝 刘咏 王岩 李维杰 汤慧萍 |
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| 作者单位： | 中南大学粉末冶金国家重点实验室;西北有色金属研究院多孔金属材料国家重点实验室; |
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| 基金项目： | Project (2009AA032601) supported by the National High-tech Research and Development Program of China; Project supported by the Postdoctoral Science Foundation of Central South University, China |
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| 摘 要： | 研究铸态和预氧化态Ni-xCr-6.8Al基合金在Na2SO4＋25%NaCl混合盐中873K时的热腐蚀行为。结果表明：NixCr6.8Al基合金的质量损失随着Cr元素含量的增加而减少,预氧化可以明显改善材料的抗热腐蚀性能,并且与Cr含量无关。Ni12Cr6.8Al基和Ni16Cr6.8Al基合金的热腐蚀动力学遵循抛物线规律,Ni-20Cr-6.8Al基合金遵循指数规律,所有的预氧化试样的热腐蚀动力学都符合对数规律。铸态合金热腐蚀的机理可以用酸碱熔融模型解释,而预氧化合金的热腐蚀机理在很大程度上由预氧化过程中形成的氧化层的性质决定。
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| 关 键 词： | Ni-Cr-Al基合金 热腐蚀 Cr含量 预氧化 动力学 腐蚀机理 |
| 收稿时间： | 1 March 2011 |
Hot corrosion behavior of Ni-xCr-6.8Al based alloys |
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| Chao HAN,Yong LIU,Yan WANG,Wei-jie LI,Hui-ping TANG.Hot corrosion behavior of Ni-xCr-6.8Al based alloys[J].Transactions of Nonferrous Metals Society of China,2011,21(11):2348-2357. |
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| Authors: | Chao HAN Yong LIU Yan WANG Wei-jie LI Hui-ping TANG |
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| Affiliation: | aState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;bState Key Laboratory of Porous Metals Materials, Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China |
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| Abstract: | The hot corrosion behaviors of as-cast and preoxidized Ni-xCr-6.8Al based alloys in the mixture of Na2SO4+25% NaCl at 873 K were studied. The results show that the mass loss of Ni-xCr-6.8Al based alloys decreases with the increase of Cr content. Preoxidation improves the resistance to corrosion regardless of the concentration of Cr. The kinetics of as-cast Ni-12Cr-6.8Al and Ni-16Cr-6.8Al based alloys fits the parabolic law well, while that of the as-cast Ni-20Cr-6.8Al based alloy fits the power law. The kin... |
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| Keywords: | Ni-Cr-Al based alloy hot corrosion Cr content preoxidation kinetics corrosion mechanism |
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