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納米晶Co-Ni-Fe合金鍍層在3.5%NaCl溶液中的腐蝕特性
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福建省自然科學(xué)基金（E0810006）


Corrosion Characteristics of Nanocrystalline Co-Ni-Fe Deposits in 3.5% NaCl Solution
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    摘要:

    利用脈沖電沉積技術(shù)制備納米晶Co-Ni-Fe合金鍍層。用EDS、XRD、TEM和SEM等手段分析納米晶鍍層的成分、微觀組織結(jié)構(gòu)和表面形貌。用電化學(xué)極化方法研究鍍層中Co含量和退火溫度對(duì)納米晶Co-Ni-Fe合金鍍層在3.5%（質(zhì)量分?jǐn)?shù)，下同）NaCl溶液中腐蝕行為的影響。結(jié)果表明，納米晶Co-Ni-Fe合金鍍層的晶體結(jié)構(gòu)為單一面心立方結(jié)構(gòu)，其晶粒尺寸隨鍍層Co含量的增加而減小。鍍層的晶粒尺寸隨退火溫度的升高而增大，并呈現(xiàn)強(qiáng)的（111）織構(gòu)。納米晶鍍層的腐蝕速率隨Co含量的增加先下降而后上升。退火可明顯降低納米晶鍍層的腐蝕速率。納米晶與粗晶Co-Ni-Fe合金鍍層經(jīng)電化學(xué)腐蝕后呈現(xiàn)出完全不同的腐蝕形貌。

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    Nanocrystalline Co-Ni-Fe alloys were synthesized by pulsed electrodeposition. The composition, microstructure and surface morphologies were studied by EDS、XRD, TEM and SEM. The effect of Co content and grain sizes on the electrochemical corrosion behaviour of nanocrystalline Co-Ni-Fe deposits in 3.5wt% NaCl solution were investigated using Tafel polarization curves. The results reveal that the grain sizes of the nanocrystalline fcc Co-Ni-Fe alloys descrease with increasing of the content of Co in the coating. The grain sizes of nanocrystalline Co-Ni-Fe alloys increase with increasing of the annealing temperature，showing a strong （111）texture. The corrosion rates of Co-Ni-Fe alloys decrease first and then increase with increasing of the Co content in the coating. The corrosion rates decline gradually with increasing of the annealing temperature. Comparing to the nanocrystalline deposits, the coarse grain deposit exhibits a quite a different corrosion morphologies.

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林綠波,戴品強(qiáng),林蘭芳,廖耀祥.納米晶Co-Ni-Fe合金鍍層在3.5%NaCl溶液中的腐蝕特性[J].稀有金屬材料與工程,2012,41(3):851~856.[Lin Lübo, Dai Pinqiang, Lin Lanfang, Liao Yaoxiang. Corrosion Characteristics of Nanocrystalline Co-Ni-Fe Deposits in 3.5% NaCl Solution[J]. Rare Metal Materials and Engineering,2012,41(3):851~856.]
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  • 收稿日期:2011-05-15
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