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Corrosion Behavior of Three Titanium Alloys in 3.5%NaCl Solution |
WANG Haijie1, WANG Jia1,3(), PENG Xin2, SHAN Chuan1 |
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China 2. Ocean Research Center of Zhoushan, Zhejiang University, Zhoushan 316000, China 3. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Corrosion behavior of three titanium alloys (TC4, TC18, TC21) in 3.5%NaCl solution was studied by means of cyclic voltammetry, SCC test with WOL pre-cracked sample and scanning electron microscope. Results showed that the pitting corrosion potential Eb of the three titanium alloys were 1.625, 1.671 and 1.871 V for TC4, TC18 and TC21, respectively. All values of Eb were high, representing the excellent pitting corrosion resistance of them. The pitting corrosion susceptibility of them could be ranked as the following descending sequence: TC4>TC18>TC21. The KISCC for TC4, TC18 and TC21 were 62.92, 66.82 and 71.99 MPam0.5 respectively and the SCC susceptibility of the three titanium alloys followed a sequence as: TC4>TC18>TC21. On the fractured surface of the alloys after SCC test, a macro-morphology with three zones representing pre-crack, stress corrosion induced crack and mechanical fracture respectively were clearly differentiated, while the stress corrosion cracking zone showed mainly ductile fracture.
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