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| Corrosion Behaviors of TC18 Titanium Alloy in Marine Atmosphere Environments |
| Received:October 21, 2017 Revised:March 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.03.007 |
| KeyWord:TC18 titanium alloy marine atmosphere environments fracture toughness fatigue crack growth rate corrosion susceptibility |
| Author | Institution |
| ZHU Yu-qin |
1.Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Key Laboratory for Environmental Effect and Protection, Chongqing , China |
| SU Yan |
1.Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Key Laboratory for Environmental Effect and Protection, Chongqing , China |
| SHU Chang |
1.Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Key Laboratory for Environmental Effect and Protection, Chongqing , China |
| SHU De-xue |
1.Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Key Laboratory for Environmental Effect and Protection, Chongqing , China |
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| Abstract: |
| Objective To provide useful references for the expansion of applications for TC18 titanium alloy as well as design and selection of product structure. Methods Atmospheric corrosion behaviors of TC18 titanium alloy in marine atmosphere environments for 6 years were investigated in virtue of the macro-micro corrosion morphology, static mechanical property, fracture toughness and fatigue crack growth rate. Results In microscopic, there was no visible corrosion as pitting. The tensile strength and fracture toughness decreased with the increase of marine atmosphere environment test time. The fracture toughness decreased by 6.7% after 4 years of test. The fracture morphology was quasi-cleavage; fatigue crack growth rate data and stress intensity factor range presented high linear relationship under da/dN-ΔK log-log plot for three test cycles of 2, 4 and 6 years. The parameters of Paris law da/dN=C(ΔK)n were C1=5.846×10-11, n1=2.320, C2=6.01×10-14, n2=3.48, C3=1.81×10-13, n3=3.30. Conclusion TC18 titanium alloy exhibits low corrosion susceptibility in marine atmosphere environment. |
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