3O9.6H2O;腐蝕速率;電化學(xué)"/>

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CeN3O9.6H2O對鎂空氣電池負(fù)極性能的影響
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昆明理工大學(xué),昆明理工大學(xué);昆明冶金研究院,昆明理工大學(xué),昆明理工大學(xué),昆明理工大學(xué)

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國家自然科學(xué)基金資助(項目號51374118,21566015)；云南省自然科學(xué)基金(2013FZ155)


Effect of CeN3O9.6H2O on the performance of magnesium air battery anode
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    摘要:

    在鎂空氣電池中,鎂負(fù)極的極化和腐蝕是衡量鎂空氣電池的重要指標(biāo)。本文通過動電位極化法和電化學(xué)阻抗譜法,研究了在8% NaCl電解液中,六水合硝酸鈰(CeN3O9.6H2O)對AZ31負(fù)極抗腐蝕性能的影響。結(jié)果表明：電解液中加入CeN3O9.6H2O,在AZ31鎂合金表面形成Ce(OH)3保護(hù)膜,提高鎂合金的耐腐蝕性。隨著CeN3O9.6H2O濃度的增大,Ce(OH)3保護(hù)膜逐漸致密,AZ鎂合金的腐蝕速率降低。當(dāng)CeN3O9.6H2O濃度達(dá)到1.0g/L時,鎂合金的腐蝕速率最低,其緩蝕率為70.4%。然而當(dāng)加入的CeN3O9.6H2O濃度大于1.0g/L時,由于Ce(OH)3保護(hù)膜被溶解而導(dǎo)致鎂合金的腐蝕速率增大。由浸泡50小時AZ合金的SEM圖發(fā)現(xiàn)CeN3O9.6H2O在鎂合金表面形成Ce(OH)3保護(hù)膜,抑制陽極反應(yīng)。從等效電路圖得到Mg2+電荷轉(zhuǎn)移阻力增大了69.5Ω,改善了鎂合金的耐腐蝕性能。通過放電測試得到加入CeN3O9.6H2O提高電池的放電性能,放電時間延長近1h。

    Abstract:

    In the magnesium air battery, the polarization and corrosion of the magnesium anode is an important index to measure the magnesium air battery. In this paper, by means of dynamic potential polarization method and electrochemical impedance spectroscopy (NaCl), the effect of six hydrated cerium (CeN3O9.6H2O) on the corrosion resistance of AZ31 cathode was studied. The results showed that CeN3O9.6H2O were added into the electrolyte to form Ce(OH)3 protective film on the surface of AZ31 magnesium alloy to improve the corrosion resistance of the magnesium alloy. With the increase of the concentration of CeN3O9.6H2O, the Ce(OH)3 protective film became denser, and the corrosion rate of AZ magnesium alloy was decreased. When the concentration of CeN3O9.6H2O reached 1.0g/L, the corrosion rate of the magnesium alloy was the lowest, and the corrosion inhibition rate was 70.4%. However, when the concentration of CeN3O9.6H2O is greater than 1.0g/L, the corrosion rate of magnesium alloy is increased due to the dissolution of Ce(OH)3 protective film. Ce(HO)3 protective film formed on the surface of magnesium alloy CeN3O9.6H2O was found by the SEM diagram of AZ alloy, which was found in the of 50h after immersion. The Mg2+ charge transfer resistance is increased by 69.5Ω from the equivalent circuit diagram, which improves the corrosion resistance of the magnesium alloy. The discharge performance of CeN3O9.6H2O was improved by the discharge test, and the discharge time was prolonged by nearly 1h.

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李慧明,謝剛.,李榮興,俞小花,侯彥靑. CeN3O9.6H2O對鎂空氣電池負(fù)極性能的影響[J].稀有金屬材料與工程,2018,47(8):2549~2554.[Li Huiminga, Xie Ganga. b, Li Rongxinga, Yu Xiaohuaa, Hou Yanqinga. Effect of CeN3O9.6H2O on the performance of magnesium air battery anode[J]. Rare Metal Materials and Engineering,2018,47(8):2549~2554.]
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  • 收稿日期:2016-09-27
  • 最后修改日期:2017-03-13
  • 錄用日期:2017-03-15
  • 在線發(fā)布日期: 2018-10-17
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