31Si12，采用退火工藝以減少亞穩(wěn)相的含量，并利用電化學(xué)阻抗譜和電位動力學(xué)極化技術(shù)分析了材料在25 ℃、7%（質(zhì)量分?jǐn)?shù)）H2SO4溶液中的耐腐蝕性，并進(jìn)行了等效電路分析。結(jié)果表明，退火處理（1050 ℃、4 h）改善了亞穩(wěn)相Ni31Si12的含量和分布，退火后Ni-Si共晶的鈍化性能和耐腐蝕性提升。亞穩(wěn)相的含量越少，耐腐蝕性能越強(qiáng)。"/>

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亞穩(wěn)相對定向凝固Ni-Si共晶腐蝕行為的影響
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作者單位:

1.西安建筑科技大學(xué) 冶金工程學(xué)院，陜西 西安 710055;2.西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，陜西 西安 710072;3.伯明翰大學(xué) 冶金與材料學(xué)院，英國 埃德巴斯頓 B15 2TT;4.陜西省冶金工程技術(shù)研究中心，陜西 西安 710055

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基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Effect of Metastable Phase on Corrosion Behavior of Direc-tionally Solidified Ni-Si Eutectic Composites
Author:
Affiliation:

1.School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;3.School of Metallurgy and Materials, University of Birmingham, Edgbaston B15 2TT, UK;4.Shaanxi Engineering Research Center of Metallurgical, Xi 'an 710055, China

Fund Project:

National Natural Science Foundation of China (51201121); Science and Technology Foundation for Selected Overseas Chinese Scholars of Shaanxi Province (2015); Key Industry Innovation Chain (Group) Project of Shaanxi Province (2019ZDLGY 04-04)

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    摘要:

    采用改進(jìn)的Bridgman定向凝固技術(shù)制備了凝固速率為25 μm/s的Ni-Si共晶復(fù)合材料。由于在凝固過程中不可避免地會產(chǎn)生亞穩(wěn)相Ni31Si12，采用退火工藝以減少亞穩(wěn)相的含量，并利用電化學(xué)阻抗譜和電位動力學(xué)極化技術(shù)分析了材料在25 ℃、7%（質(zhì)量分?jǐn)?shù)）H2SO4溶液中的耐腐蝕性，并進(jìn)行了等效電路分析。結(jié)果表明，退火處理（1050 ℃、4 h）改善了亞穩(wěn)相Ni31Si12的含量和分布，退火后Ni-Si共晶的鈍化性能和耐腐蝕性提升。亞穩(wěn)相的含量越少，耐腐蝕性能越強(qiáng)。

    Abstract:

    The modified Bridgman directional solidification technique was used to prepare the Ni-Si eutectic composites at solidification rate of 25 μm/s. However, the formation of metastable phase Ni31Si12 was inevitably during solidification process. Annealing treatment was conducted to reduce the number of metastable phases. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to analyze the corrosion resistance of Ni-Si eutectic composites in the 7wt% H2SO4 solution at 25 °C. The equivalent circuit was analyzed. Results show that the passivation performance and corrosion resistance behavior of Ni-Si eutectic composites are improved after annealing at 1050 °C for 4 h, which is mainly attributed to improvement of content and distribution of metastable phase Ni31Si12. The less the content of metastable phase, the stronger the corrosion resistance.

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崔春娟,劉薇,鄧力,王松苑,蘇海軍,蘆禹.亞穩(wěn)相對定向凝固Ni-Si共晶腐蝕行為的影響[J].稀有金屬材料與工程,2021,50(9):3110~3115.[Cui Chunjuan, Liu Wei, Deng Li, Wang Songyuan, Su Haijun, Lu Yu. Effect of Metastable Phase on Corrosion Behavior of Direc-tionally Solidified Ni-Si Eutectic Composites[J]. Rare Metal Materials and Engineering,2021,50(9):3110~3115.]
DOI：10.12442/j. issn.1002-185X.20200581

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  • 收稿日期:2020-08-07
  • 最后修改日期:2020-09-08
  • 錄用日期:2020-09-18
  • 在線發(fā)布日期: 2021-09-26
  • 出版日期: 2021-09-24