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A method for investigation of hot corrosion by gaseous Na2SO4 |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Science and Technology on Advanced High Temperature Structural Materials laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;3. Konca Solar Cells Co., Ltd, Wuxi 214000, China;4. School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, United Kingdom |
| Abstract: | A novel in situ exposure method for investigating hot corrosion of aluminde coatings in the absence of an alkali sulphate melt is presented. The samples are exposed to Na2SO4(g) at a temperature above the dew point of the gas. Results from 100 and 500 h exposures at 900 °C of Ni-based In792 covered with SIF232 aluminide coating are presented. Already after 100 h of testing, attack characteristic for Type I hot corrosion is observed. The reactions taking place during the testing are discussed and the results are compared with those from the well-known ex situ salt hot corrosion test. |
| Keywords: | C. Hot corrosion A. Superalloy C. Sulfidation B. SEM B. XPS |
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