| YANG Bo,LI Mao-dong,LIU Kang-sheng,LIU Guang-ming,ZHAI Wei,LIN Jin-mei,WANG Yuan-kui.Hot Corrosion Behavior of 45CT Coating Prepared by HOVF in KCl+K2SO4+Na2SO4 Molten Salt[J],46(2):178-183 |
| Hot Corrosion Behavior of 45CT Coating Prepared by HOVF in KCl+K2SO4+Na2SO4 Molten Salt |
| Received:October 12, 2016 Revised:February 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.02.029 |
| KeyWord:P12 steel 45CT coating hot corrosion kinetics |
| Author | Institution |
| YANG Bo |
Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou , China |
| LI Mao-dong |
Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou , China |
| LIU Kang-sheng |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| LIU Guang-ming |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| ZHAI Wei |
Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou , China |
| LIN Jin-mei |
Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou , China |
| WANG Yuan-kui |
Material Research Institute, Dongfang Boiler Group Co., Ltd., Zigong , China |
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| Abstract: |
| The work aims to study corrosion property of 45CT coating prepared by HOVF in KCl + K2SO4+ Na2SO4 molten salt, and understand the protection and failure mechanisms of 45CT coating in molten salt. The samples were immersed in KCl+K2SO4+Na2SO4 mixed molten salt to obtain corrosion kinetic of the samples in the molten salt at different temperatures. The composition, structure and morphology of high temperature corrosion products were investigated by using XRD, SEM and EDS. Main corrosion products of the 45CT coating corroded molten salt were identified as Cr2O3 and NaCrO2. The coating could protect the substrate effectively and the layer of corrosion products on it was thinner at 600 ℃ and 650 ℃. However, the coating degraded seriously at 700 ℃ and a lot of sulfides were detected in the coating. Fe in the substrate diffused toward the coating. Sulphidation occurs easily in 45CT coating at high temperature, leading to weak bonding between the oxide film and coating. As temperature increases, hot corrosion of 45CT coating in KCl+ K2SO4+Na2SO4 molten salt becomes more serious and results in faster coating degradation. |
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