Hot Corrosion Behavior of Hf-Doped NiAl Coating in the Mixed Salt of Na2SO4 + K2SO4 at 900 °C

被引：0
|
作者：
W. L. Zhang
W. Li
L. B. Fu
X. Peng
J. Sun
S. M. Jiang
J. Gong
C. Sun
机构：
[1] Chinese Academy of Sciences,Shi
[2] University of Science and Technology of China,Changxu Innovation Center for Advanced Materials, Institute of Metal Research
[3] Qilu University of Technology (Shandong Academy of Sciences),School of Materials Science and Engineering
来源：
Acta Metallurgica Sinica (English Letters) | 2023年 / 36卷
关键词：
Hot corrosion; Hafnium; Oxide scale; Titanium; Sulfide;
D O I：
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中图分类号：
学科分类号：
摘要：
The hot corrosion behavior of the NiAl coating and the 5Hf-NiAl coating induced by mixed salt at 900 °C was investigated. Comparing with the NiAl coating, the 5Hf-NiAl coating exhibited superior hot corrosion resistance because the addition of Hf promoted the formation of protective oxide scale and reduced the growth rate of oxide scale. Therefore, internal sulfides were not present in the 5Hf-NiAl coating after hot corrosion for 140 h. Cr exhibited different distribution in the two coatings since the addition of Hf changed the hot corrosion process of the coating. Hf and Ti in the 5Hf-NiAl coating trapped and captured sulfur, preventing the penetration of sulfur into the coating. The hot corrosion mechanism of the two coating and the effects of Hf on this process were discussed in this work.
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页码：1409 / 1420
页数：11
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