A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere
CONG Hongda1, WANG Jinlong1(), WANG Cheng2,3, NING Shen1, GAO Ruoheng1, DU Yao2, CHEN Minghui1, ZHU Shenglong2, WANG Fuhui1
1.Shenyang National Key Laboratory for Materials Science, Northeastern University, Shenyang 110819, China 2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3.Jiangsu JITRI Road Engineering Technology and Equipment Research Institude Co. Ltd., Xuzhou 220005, China
Cite this article:
CONG Hongda, WANG Jinlong, WANG Cheng, NING Shen, GAO Ruoheng, DU Yao, CHEN Minghui, ZHU Shenglong, WANG Fuhui. A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere. Acta Metall Sin, 2022, 58(8): 1083-1092.
CB2 steel (ZG12Cr9Mo1Co1NiVNbNB) is a ferritic stainless steel with excellent creep properties at high temperature (550-700oC) and is mainly used in 600oC ultrasupercritical units. The poor oxidation resistance of the material limits its practical applications in harsh, high-temperature environments, in which the steam unit faces high-temperature water vapor for a long period of time. Therefore, surface modification or coating has become an important means to improve the high-temperature oxidation resistance of the material. An inorganic silicate coating has the advantages of high thermal-chemical stability, similar thermal expansion coefficient, and simple preparation process, which can significantly improve the oxidation and corrosion resistance of the material. In this study, a new type of inorganic silicate composite coating was designed, based on the CB2 steel. The oxidation behavior of CB2 steel and coated specimens at 650oC high-temperature steam atmosphere for 1000 h was studied by using a high-temperature water vapor simulation device. The results showed that the oxidation rate of the coated CB2 steel was 30 times slower than that of uncoated CB2 steel; thus, the coating exhibited a good protective effect. After 1000 h of oxidation, the oxide scale on the CB2 steel was loose and cracked with obvious voids and the oxidation product was mainly composed of Fe2O3. The inorganic silicate composite coating significantly improved the oxidation resistance of CB2 steel; after 1000 h of oxidation, no spallation areas or cracks were found.
Fund: National Natural Science Foundation of China(51671053);National Natural Science Foundation of China(51801021);Ministry of Industry and Information Technology Project(MJ-2017-J-99)
From grey to yellowish-white, the zinc powder sintering
3
FEP
Light red
4
Al2O3
Unchanged
5
ZrO2
Unchanged
6
Glass
Unchanged
7
CCB
Unchanged
8
TiO2
Unchanged
9
SiC
Unchanged
10
KAl2(AlSi3O10)(OH)2
Unchanged
Table 1 The changes of color and state of different fillers after oxidation at 650oC
No.
Mass fraction of
Mass fraction of
Curing reaction
Appearance
Water resistance
potassium silicate / %
AlH2P3O10 / %
1
100
0
Apparent cured
Flat and smooth
No water resistance
2
95
5
Fully cured
Flat and smooth
Well
3
90
10
Fully cured
Flat and smooth
Well
4
85
15
Fully cured
More surface particles
Well
5
80
20
Fully cured
More surface particles
Well
Table 2 The solidification behaviors of AlH2P3O10 in potassium silicate
Fig.1 Schematic of high-temperature oxidation device for corrosion test in steam atmosphere
Fig.2 Oxidation kinetic curves of CB2 steel and its inorganic coating after oxidized in high temperature steam atmosphere at 650oC for 1000 h (a) and its locally enlarged part for the first 200 h (b)
Fig.3 XRD spectra of CB2 steel (a) and its inorganic coating (b) after oxidized in high-temperature steam atmosphere at 650oC for 1000 h
Fig.4 Surface morphologies of CB2 specimen (a, c) and its inorganic coating (b, d) in high-temperature steam atmosphere at 650oC for 500 h (a, b) and 1000 h (c, d)
Fig.5 Cross-sectional morphologies of CB2 specimen (a, c) and its inorganic coating (b, d) in high-temperature steam atomsphere at 650oC for 500 h (a, b) and 1000 h (c, d) (The right figures in Fig.5c are the corresponding EDS result, and the inset in Fig.5d is the local enlargement of the box)
Position
Fe
Cr
O
Mn
1
24.72
0.74
74.54
0
2
16.85
9.25
73.18
0.73
3
22.47
0.13
77.25
0.15
4
19.16
5.82
74.61
0.41
Table 3 EDS analyses of positions 1-4 in Fig.5
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