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| Effect of Salt Deposition Mode on the Hot Salt Corrosion Behavior of TC11 Titanium Alloy |
| Received:November 13, 2023 Revised:December 12, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.12.005 |
| KeyWord:compressor blades TC11 titanium alloy artificial salt coating salt spray corrosion hot salt corrosion corrosion characteristics |
| Author | Institution |
| SHI Hai-lan |
School of Civil Aviation, Northwestern Polytechnical University, Xi'an , China |
| DING Guo-yin |
School of Civil Aviation, Northwestern Polytechnical University, Xi'an , China |
| ZHANG Xiao-hua |
School of Civil Aviation, Northwestern Polytechnical University, Xi'an , China |
| LIU Dao-xin |
School of Civil Aviation, Northwestern Polytechnical University, Xi'an , China |
| GAO Yu-chen |
School of Civil Aviation, Northwestern Polytechnical University, Xi'an , China |
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| Abstract: |
| The work aims to comparatively study the effect of salt film deposited by artificial salt coating method and salt spray test method on the hot corrosion behavior of TC11 titanium alloy. The corrosion morphology, corrosion kinetics and corrosion mechanism of TC11 titanium alloy specimens subject to hot salt corrosion at 500 ℃ by artificial salt coating method and salt spray test method were comparatively analyzed. There were obvious differences in the distribution pattern of salt on the surface of TC11 titanium alloy specimens subjectto two different ways of salt film deposition.The salt on the surface of the salt spray corrosion specimen had a localized aggregation phenomenon, and the salt distribution of the artificially coated salt specimen was more uniform. After the hot salt corrosion test of the specimens subject to two ways of salt deposition, from the perspective of the locally serious corrosion area S, artificially coated salt specimen>salt spray test specimen; and from the perspective of the maximum depth of localized corrosion D, salt concentration area of salt spray test specimen>artificially coated salt specimen>salt less area of salt spray test specimen. The corrosion kinetics obeyed the parabolic law, and the parabolic rate constants of hot salt corrosion of the salt spray test specimen and the artificially coated salt specimen were 26and 63 times higher than those of oxidation of the undeposited salt specimen, respectively. The hot salt corrosion mechanisms of the two types of salt deposited specimens were the same and the failure modes weresimilar. The artificial salt coating method can replace the salt spray test for accelerated laboratory test of hot salt corrosion of titanium alloys, but it is necessary to pay attention to the existence of certain differences in the characteristics of corrosion morphology. |
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