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化學(xué)鍍Ni-Co-Cu-P非晶鍍層及其耐蝕性能研究
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中國礦業(yè)大學(xué),中國礦業(yè)大學(xué),中國礦業(yè)大學(xué),中國礦業(yè)大學(xué)

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TQ153.3

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中央高校基本科研業(yè)務(wù)費(fèi)(2014QNA16)


Electroless Deposition and Corrosion Resistance of Ni-Co-Cu-P Amorphous Coatings
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China University of Mining and Technology,China University of Mining and Technology,China University of Mining and Technology,China University of Mining and Technology

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    摘要:

    采用化學(xué)鍍工藝在45鋼表面制備Ni-Co-Cu-P四元合金鍍層，通過EDX、XRD、SEM、鹽霧試驗(yàn)、Tafel曲線等測試方法研究鍍層的成分、晶型結(jié)構(gòu)和耐蝕性能。結(jié)果表明：Ni-Co-Cu-P鍍層為非晶結(jié)構(gòu)，其中Ni、Co、Cu的含量分別為32.66 wt.%、47.19 wt.%和15.28 wt.%。鍍層表面均勻分布著直徑約240 ~ 500 nm的球狀團(tuán)簇，一些團(tuán)簇內(nèi)部存在納米級孔隙。鍍層經(jīng)156 h鹽霧后出現(xiàn)明顯紅色銹點(diǎn)，192 h后完全失效。鍍層的耐蝕性能明顯優(yōu)于45鋼基體和Ni-Co-P鍍層。在1.0 wt.% H2SO4溶液中，鍍層的自腐蝕電位和腐蝕電流密度分別為-0.26 V和19.17 μA?cm-2，隨著電位的升高表面出現(xiàn)大量微裂紋。而在3.5 wt.% NaCl溶液中，鍍層表現(xiàn)出活化-鈍化-過鈍化的腐蝕行為，表面鈍化膜逐漸被Clˉ穿透而形成針孔。

    Abstract:

    Quaternary Ni-Co-Cu-P coatings were synthesized on 45 steel substrates by electroless deposition. The chemical composition, crystal structures and corrosion properties of the coatings were investigated by EDX, XRD, SEM, salt spray tests and Tafel polarization curves. The results indicated that Ni-Co-Cu-P coatings were amorphous with the content of 32.66 wt.% Ni, 47.19 wt.% Co and 15.28 wt.% Cu. Spherical clusters with the diameter of 240 ~ 500 nm were distributed uniformly on the coating surfaces and some clusters contained nano-sized poles. The coatings showed visible red rust points after 156 h and were totally failed after 192 h in neutral salt spray tests. Moreover, corrosion resistance of the coatings was much better than that of the 45 steel substrates and Ni-Co-P coatings. In 1.0 wt.% H2SO4 solution, corrosion potential and corrosion current density of the coatings were -0.26 V and 19.17 μA?cm-2 respectively. By increasing the potential, numerous microcracks emerged on the coating surfaces. In 3.5 wt.% NaCl solution, the coatings exhibited an active-passive-transpassive behavior with passive films penetrated by Clˉ and resulted with pin-holes.

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張含卓,李晶,歐雪梅,陳輝.化學(xué)鍍Ni-Co-Cu-P非晶鍍層及其耐蝕性能研究[J].稀有金屬材料與工程,2016,45(11):2965~2969.[Zhang Hanzhuo, Li Jing, Ou Xuemei, Chen Hui. Electroless Deposition and Corrosion Resistance of Ni-Co-Cu-P Amorphous Coatings[J]. Rare Metal Materials and Engineering,2016,45(11):2965~2969.]
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  • 收稿日期:2016-01-03
  • 最后修改日期:2016-04-21
  • 錄用日期:2016-05-18
  • 在線發(fā)布日期: 2016-12-08
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