Effect of oxygen-fuel ratio on microstructure and hot corrosion behavior of NiCrAlY coatings in KCl molten salt

被引：1

作者：

Hu K. ^{[1
,2
]}

Liu X. ^{[1
,3
]}

Zhang S.-H. ^{[1
,2
]}

Wang S.-Y. ^{[3
]}

Wu C.-J. ^{[4
]}

Zhu G.-H. ^{[3
]}

Ding Y. ^{[5
]}

机构：

[1] Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Ma'anshan

[2] School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan

[3] Anhui Masteel Surface Technology Co., Ltd., Ma'anshan

[4] China Aerospace Materials and Technology Research Institute, Beijing

[5] Masteel (Group) Holding Company Ltd., Ma'anshan

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 06期

基金：

中国国家自然科学基金;

关键词：

High-velocity oxygen fuel spraying; Hot corrosion; Microstructure; NiCrAlY coating; Oxygen-fuel ratio;

D O I：

10.11817/j.ysxb.1004.0609.2021-36563

中图分类号：

学科分类号：

摘要：

The NiCrAlY coatings with oxygen-fuel ratio of 3.91, 4.31, 4.62 and 5.39, respectively, were prepared by high-velocity oxygen fuel spraying (HVOF). The changes of microstructure and mechanical properties of the coating were characterized by XRD, SEM, EDS, microhardness meter and tensile testing machine. Then, the effect of microstructure on hot corrosion behaviors of coatings in KCl molten salt environment was investigated. The results show that, with the increase of the oxygen-fuel ratio, the γ/γ' peak shifts to a high angle, the denser coating structure is obtained and the boundaries of unmelted particles decrease. The coating bonding strength increases from 49 MPa to 62 MPa, while the oxygen-fuel ratio has little effect on the microhardness of the coating. The average hot corrosion rate constant Kp decreases from 93.37 mg2/(cm4•h) to 1.54 mg2/(cm4•h), which implies that the hot corrosion resistance of the coating enhances with the increase of oxygen-fuel ratio. The lower porosity and fewer unmelted particle boundaries in the high oxygen-fuel ratio coating result in the decrease of the diffusion channels of Cl and O. So, the extent of chlorination-oxidation of the coating decreases, thereby, endowing the coating with better hot corrosion resistance. © 2021, Science Press. All right reserved.

引用

页码：1545 / 1558

页数：13

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