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| Hot Corrosion and Failure Behavior of Three Thermal Spraying Coatings in Simulated Atmosphere/Coal Ash Environment |
XIONG Yi1, LIU Guangming1( ), ZHAN Fuyuan2, MAO Xiaofei3, LUO Qin2, HONG Jia1, NI Jinfei4, LIU Yongqiang1 |
1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2.CHN Energy Fengcheng Power Generation Co. , Ltd. , Fengcheng 331100, China
3.Guodian Science and Technology Research Institute Limited, Wuhan 430066, China
4.Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, China |
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Abstract Three coatings of 45CT, NiCr/Cr3C2 and NiCrAlY were prepared on the surface of T91 steel by high velocity oxygen fuel spray. The hot corrosion behavior of the coated steel was examined in a simulated flue gas at 750 ℃ for the prepared samples enveloped with a layer of synthetic coal ash of 37.5%Na2SO4+37.5%K2SO4+15%Fe2O3+10%SiO2. The sample was weighed at a certain interval to obtain the corrosion kinetic curve. The thickness changes of the coatings before and after 200 h corrosion were measured. The composition, structure and morphology of high temperature corrosion products were characterized by means of XRD, SEM and EDS. The results show that the bare T91 steel suffered from serious corrosion with corrosion products peeled off in large quantities. Mass gain in the early corrosion stage and then mass loss in the late corrosion stage was observed for the three coatings. After 200 h corrosion, the thinning amount of the three coatings 45CT, NiCr/Cr3C2 and NiCrAlY was about 25, 112.7 and 93.1 μm, respectively. The corrosion products remaining on the surface of T91 steel after corrosion were identified as mainly Fe2O3. The main corrosion products on the surface of 45CT coating was Cr2O3. However, the corrosion products of NiCr/Cr3C2 and NiCrAlY were Cr2O3 and NiCr2O4. Some coal ash particles were embedded in the corrosion products. For three coatings, corrosion media would diffuse through the coating to the coating/substrate interface during the test, which would lead to substrate corrosion. The substrate of beneath coatings of 45CT and NiCr/Cr3C2 suffered from serious corrosion, which led to cracks formation at the interface of coating and substrate. However, the substrate of beneath NiCrAlY coating showed slight corrosion, which may be ascribed to the low porosity and reactive element effect of rare earth of the coating.
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Received: 06 April 2020
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| Fund: National Natural Science Foundation of China(51961028) |
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Corresponding Authors:
LIU Guangming
E-mail: gemliu@126.com
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About author: LIU Guangming, E-mail: gemliu@126.com
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