| WANG Hao,ZHANG Jiao-jiao,FENG Xiao-fei,WANG He-feng.Effect of Surface Boronizing on Corrosion Resistance of New β-Titanium Alloy[J],49(5):230-236 |
| Effect of Surface Boronizing on Corrosion Resistance of New β-Titanium Alloy |
| Received:April 30, 2019 Revised:May 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.05.028 |
| KeyWord:β-titanium alloy boronizing modified coating electrochemical test pack cementation corrosion |
| Author | Institution |
| WANG Hao |
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan , China |
| ZHANG Jiao-jiao |
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan , China |
| FENG Xiao-fei |
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan , China |
| WANG He-feng |
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan , China |
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| Abstract: |
| The paper aims to improve the corrosion resistance of new β-titanium by preparing boronizing coating. In this paper, the surface of Ti-33Nb-4Sn (334 titanium) was boronized in air and N2 atmosphere at different temperature by pack cementation. The surface morphology and cross-section morphology of the coating were compared and analyzed, and the growth rule of boronizing coating was summarized. The electrochemical test method was used to determine the electrochemical corrosion performance of 334 titanium alloy substrate and boronizing coating in 3.5% (mass fraction) NaCl solution. Under different preparation conditions, a dense and continuous boronizing coating can be formed on the surface of the 334 titanium alloy. The coating consists of a dense outer layer and a needle-like transition layer. For the coating prepared in the same atmosphere, the thickness of the dense outer coating increased with the increase of the boronizing temperature. The thickness of the dense outer coating prepared in N2 atmosphere was thicker than the coating prepared in air at the same temperature. After boronizing treatment under different conditions, the open circuit potential of the substrate increased. The self-corrosion potential of 334 titanium alloy was 0.6692 V and its corrosion current density was 2.356 μA/cm2. After boronizing in the air at 900, 950, 1000 ℃, the self-corrosion potential was 1.0993, 0.7221, 0.7639 V, the corrosion current density was 3.377, 2.274, 1.584 μA/cm2. After boronizing in N2 atmosphere at 900, 950, 1000 ℃, the corrosion potential was 0.8617, 0.6804, 0.8143 V, and the corrosion current densities was 1.358, 1.445, 1.525 μA/cm2. The boronizing coating can improve the corrosion resistance of 334 titanium alloy. The coatings made in N2 atmosphere have better comprehensive corrosion resistance than that made in air. |
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