| SHAO Hong-hong,CHEN Ting-ting,ZHU Zi-hong,WANG Lan.Effects of Phosphating Time on Morphology and Properties of Phosphating Film on NiTi Alloy in Ultrasonic Field[J],46(1):23-28 |
| Effects of Phosphating Time on Morphology and Properties of Phosphating Film on NiTi Alloy in Ultrasonic Field |
| Received:September 28, 2016 Revised:January 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.01.004 |
| KeyWord:NiTi alloy ultrasonic field phosphating corrosion resistance wear resistance biological property |
| Author | Institution |
| SHAO Hong-hong |
Jiangsu University, Zhenjiang , China |
| CHEN Ting-ting |
Jiangsu University, Zhenjiang , China |
| ZHU Zi-hong |
Jiangsu University, Zhenjiang , China |
| WANG Lan |
Jiangsu University, Zhenjiang , China |
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| Abstract: |
| To reduce harm of nickel ion overflow on human body through modified treatment of surface and improve its mechanical and biological properties. Ultrasonic phosphating technology was used to prepare phosphating films on the surface of NiTi alloy. The effect of phosphating time on the morphology and properties of phosphating film was studied. Morphology, structure, composition, corrosion resistance, abrasive resistance and biological activity of the surface were studied by scanning electron microscope (SEM), X ray diffracmeter (XRD), energy dispersive spectroscopy (EDS), friction/wear meter, electrochemical workstation, etc. The optimal phosphating time was 1 h; the phosphating film was uniform, compact and complete, and the thickness was about 17.5 μm. The corrosion potential increased from -0.72 V of the substrate to -0.3229 V and the corrosion current density decreased by 2 orders of magnitude. The friction coefficient was stable at around 0.12, reduced a lot when com-pared to 0.50 of the substrate. After being soaked in SBF for 30 days, the surface adsorbed fine and uniform and dense hydrox-yapatite successfully. Ultrasound phosphating treatment can improve corrosion resistance, wear resistance and biological properties of NiTi alloy significantly. |
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