2;循環(huán)伏安法"/> 2和TiB組成,且TiB2滲層厚度為1.2~4.5μm,滲層厚度隨電流密度非線性變化。循環(huán)伏安法結(jié)果顯示陰極的反應(yīng)主要是鈉離子的還原,鈉離子再將B2O3中的B置換出來(lái),高溫下B原子向鈦基體擴(kuò)散而形成硼化物滲層。"/>

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電流密度對(duì)Na2B4O7-CaCl2熔鹽電解法制備TiB2/TiB滲層的影響
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西安建筑科技大學(xué) 陜西省冶金工程技術(shù)研究中心,西安建筑科技大學(xué) 陜西省冶金工程技術(shù)研究中心,西安建筑科技大學(xué) 陜西省冶金工程技術(shù)研究中心,西安建筑科技大學(xué) 陜西省冶金工程技術(shù)研究中心,西安建筑科技大學(xué) 陜西省冶金工程技術(shù)研究中心

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國(guó)家自然科學(xué)基金資助(51404186):陜西省教育廳科研計(jì)劃項(xiàng)目(13JS060)


EFFECTS OF CURRENT DENSITY ON TiB2/TiB LAYER BY MOLTEN SALTELECTROLYSIS IN Na2B4O7-CaCl2 MELT
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Xi’an University of Architecture & Technology,,,,

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    摘要:

    采用熔鹽電解法在純鈦表面滲硼,以硼砂作硼源,無(wú)水氯化鈣為支持電解質(zhì),在電解溫度930℃,電解時(shí)間1h的條件下,研究不同電流密度對(duì)滲層物相、微觀結(jié)構(gòu)及滲層厚度的影響,并用循環(huán)伏安法對(duì)陰極反應(yīng)機(jī)理進(jìn)行了研究。利用XRD對(duì)滲硼試樣表面進(jìn)行物相分析,利用掃描電鏡(SEM)觀察滲硼試樣的斷面形貌并采用能譜(EDS)進(jìn)行元素分析,結(jié)果表明：在不同的電流密度下電解滲硼,得到的滲層均由TiB2和TiB組成,且TiB2滲層厚度為1.2~4.5μm,滲層厚度隨電流密度非線性變化。循環(huán)伏安法結(jié)果顯示陰極的反應(yīng)主要是鈉離子的還原,鈉離子再將B2O3中的B置換出來(lái),高溫下B原子向鈦基體擴(kuò)散而形成硼化物滲層。

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    The method of molten salt electrolysis was applied for boronizing of Titanium. The experiment was carried out at 930 ℃ for1h, using Borax as the source of boron and Calcium Chloride as supporting electrolyte. The effects of current density on the microstructure and the thickness of the TiB2/TiB layer were investigated and the electrochemical behavior of cathode in molten salt was studied by Cyclic Voltammetry. XRD, SEM and EDS means were applied to analyze phase composition, microstructure and morphology, element content of the borides layer respectively. The results show that the bording layer was composed of TiB2 and TiB, with the thickness of the TiB2 layer being 1.2 to 4.5μm depending on the current density; the thickness of the TiB2 layer changes nonlinearly with the increase of the current density；Analysis of the Cyclic Voltammetry curve shows that the cathodic reaction was mainly the reduction of sodium ions to sodium, then boron was reduced by sodium from B2O3; the borides layer was formed by the diffusion of B atoms into titanium substrate at high temperature.

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王碧俠,馬興飛,李斗,劉歡,李建新.電流密度對(duì)Na2B4O7-CaCl2熔鹽電解法制備TiB2/TiB滲層的影響[J].稀有金屬材料與工程,2018,47(7):2120~2125.[WANG Bixia, MA Xingfei, Li Dou, Liu Huan, Li Jianxin. EFFECTS OF CURRENT DENSITY ON TiB2/TiB LAYER BY MOLTEN SALTELECTROLYSIS IN Na2B4O7-CaCl2 MELT[J]. Rare Metal Materials and Engineering,2018,47(7):2120~2125.]
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  • 收稿日期:2016-12-21
  • 最后修改日期:2017-04-10
  • 錄用日期:2017-04-14
  • 在線發(fā)布日期: 2018-10-10
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