Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings

Cao Tieliang; Geng Weimin; Ni Zhengyu; Zhou Qingchu; Pan Huiying

doi:10.13374/j.issn1001-053x.1996.s2.009

Volume 18 Issue S2

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Article Navigation > Chinese Journal of Engineering > 1996 > 18(S2): 42-45

Cao Tieliang, Geng Weimin, Ni Zhengyu, Zhou Qingchu, Pan Huiying. Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings[J]. Chinese Journal of Engineering, 1996, 18(S2): 42-45. doi: 10.13374/j.issn1001-053x.1996.s2.009

Citation:

Cao Tieliang, Geng Weimin, Ni Zhengyu, Zhou Qingchu, Pan Huiying. Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings[J]. Chinese Journal of Engineering, 1996, 18(S2): 42-45. doi: 10.13374/j.issn1001-053x.1996.s2.009

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Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings

doi: 10.13374/j.issn1001-053x.1996.s2.009

Shanghai Institute of Metallurgy, Chinese Academy of Science, Shanghai

Received Date: 1996-01-22
Available Online: 2021-11-13

Abstract

Abstract

Aluminum-chromium diffusion coatings on pure nickel substrate were formed by two-step pack cementation process. It was found that existed many voids in the coatings which were formed by first aluminizing and then chromizing. It could be understood that aluminum in the coatings reacted with HCL gas decomposed from activator NH₄CL and formed ACL₃,which evaporated and resulted in formation of the voids.Oxidation resistance of Al-Cr coating with these voids was reduced signigicantly.
- halide activator,
- Al-Cr diffusion coatings,
- voids