The High Temperature Corrosion of Fe- and Ni-base alloys with NaF Coating
碩士 === 國立臺灣科技大學 === 機械工程系 === 92 === The hot corrosion behavior of 4 different Fe-(Ni)-Cr alloys containing 718， 353MA， 310， and 430 was studied in static air at 850℃ and 1000℃ with/or without 2mg/cm2 NaF deposit. After corrosion tests， the samples were examined by OM， SEM/EDX， XRD and EP...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/16180470013790443421 |
| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 92 === The hot corrosion behavior of 4 different Fe-(Ni)-Cr alloys containing 718， 353MA， 310， and 430 was studied in static air at 850℃ and 1000℃ with/or without 2mg/cm2 NaF deposit. After corrosion tests， the samples were examined by OM， SEM/EDX， XRD and EPMA analysis. The thermogravity curves reveal that the alloys with NaF deposit suffered obviously accelerated oxidation. The nickel free 430 alloy exhibits the highest weight gain at both temperature. Nevertheless， the total depth of attack of 430 alloy was largest at 1000℃， but 718 alloy highest nickel concentration was the biggest one at 850℃. Furthermore, during corrosion test the chromium selective corroded, the next one was iron, and nickel appeared as noble component in matrix surface of alloys. Partial chromium and iron reacted with NaF to form evaporated products during high temperature corrosion.
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