Microstructure and hot corrosion behavior of Al-Ce-Y coatings on DZ125 nickel-based alloy prepared by pack cementation process

被引：8

作者：

Li Yong-quan ^{[1
]}

Li Ji-lin ^{[1
]}

Qin Chun ^{[1
]}

Jiang Liang ^{[1
]}

Geng Gui-hong ^{[1
]}

机构：

[1] North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2020年 / 27卷 / 02期

基金：

中国国家自然科学基金;

关键词：

DZ125; alloy; Ce-Y modified aluminum coating; structure; hot corrosion; ULTRAHIGH TEMPERATURE ALLOY; RESISTANCE;

D O I：

10.1007/s11771-020-4303-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In order to improve the hot corrosion resistance of DZ125 alloy, Ce-Y modified aluminum coatings were prepared on DZ125 alloy by pack cementation process at 950 degrees C for 2 h. The microstructure, phase constitution and formation mechanism of the coatings were investigated. The hot corrosion behaviors of DZ125 alloy and the coatings in molten salt environment of 25%K2SO4+75%Na2SO4 (mass fraction) at 900 degrees C were studied. Results show that the obtained Al-Ce-Y coatings were mainly composed of Al3Ni2, Al3Ni and Cr7Ni3, with a thickness of about 120 mu m. After hot corrosion test, DZ125 alloy suffered catastrophic hot corrosion and serious internal oxidation and internal sulfidation arose. Two layers of corrosion products formed on surfaces of DZ125 alloy, including the outer layer consisting of Cr2O3 and NiCr2O4, and the inner layer of Al2O3, Ni3S2 and Ni-base solid solution. After being coated with Al-Ce-Y coating, the hot corrosion resistance of DZ125 alloy is improved notably, due to the formation of a dense scale mainly consisting of Al-rich Al2O3 in the coating layer.

引用

页码：381 / 387

页数：7

共 21 条

[11] Lin NM, 2010, J CENTRAL S U TECHNO, V17, P1144
[12] Hot Corrosion Behavior of Si-Y-Co-Modified Aluminide Coating Exposed to NaCl + Na2SO4 Salt at 1173 K
Liu, Zongjie
Zhou, Chungen
[J]. OXIDATION OF METALS, 2016, 85 (1-2): : 205 - 217
[13] Stathokostop D, 2014, J ELECT MAT, P3733
[14] Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy
Wu, Duoli
Jiang, Sumeng
Fan, Qixiang
Gong, Jun
Sun, Chao
[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS, 2014, 27 (04) : 627 - 634
[15] Aluminide coating formation on nickel-base superalloys by pack cementation process
Xiang, ZD
Burnell-Gray, JS
Datta, PK
[J]. JOURNAL OF MATERIALS SCIENCE, 2001, 36 (23) : 5673 - 5682
[16] Microstructure and mechanical property of MIM 418 superalloy
Yang, Fu-Bao
Jing, Yan-Hong
Li, Dan
Zhang, Lin
Li, Da-Quan
Zhu, Qiang
[J]. RARE METALS, 2018, 37 (01) : 35 - 39
[17] ZHANG JZ, 2006, MAT REV, V20, P223
[18] Zhang P, 2011, CORROS SCI, P4291
[19] Y and Al modified silicide coatings on an Nb-Ti-Si based ultrahigh temperature alloy prepared by pack cementation process
Zhang, Ping
Guo, Xiping
[J]. SURFACE & COATINGS TECHNOLOGY, 2011, 206 (2-3) : 446 - 454
[20] Corrosion behaviors and mechanism of electroless Ni-Cu-P/n-TiN composite coating
Zhou Hong-ming
Hu Xue-yi
Li Jian
[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY, 2018, 25 (06) : 1350 - 1357

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