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氮化鉻梯度膜的制備和電化學(xué)性能研究
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TG146.4

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Preparation and Electrochemical Properties of Gradient CrNx Coatings on H13 Steel
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    摘要:

    在H13鋼基體上制備了幾種成分的CrNx雙層膜和梯度膜。使用X光電子能譜(XPS)分析了膜層的成分，使用X射線衍射儀(XRD)分析膜層的主要相結(jié)構(gòu)：同時檢測了膜層的硬度與工藝參數(shù)的關(guān)系。系統(tǒng)地研究了膜層的動電位極化曲線，梯度膜能夠明顯降低膜層的腐蝕電流密度。使用掃描電子顯微鏡(SEM)，研究了膜層顯微結(jié)構(gòu)和性能之間的關(guān)系，并提出了雙層膜和梯度膜的結(jié)構(gòu)模型。膜層的主要成分、結(jié)構(gòu)都隨著氮?dú)夥謮憾淖?。隨著氮?dú)夥謮簭?．05Pa提高到2Pa，CrNx膜層中的N／Cr原子比從0．08提高到0．67。氮?dú)夥謮?．05Pa時，雙層膜的成分包括Cr(bcc)和Cr2N(hex)，在分壓達(dá)到2Pa時，膜層主要成分為CrN(fcc)，在梯度膜中有一個CrN(220)擇優(yōu)取向。相對于CrN／Cr／H13雙層膜，梯度薄膜的抗腐蝕性能有明顯提高。在雙層膜上有較多較深的微孔，而在梯度膜表面比較鮮見。

    Abstract:

    Chromium nitride (CrN) coatings deposited by physical vapor deposition (PVD) processes have been adopted for wear protection of cutting tools and various metallic components for years. To further improve the electrochemical performances of CrN coatings, duplex CrNx coatings of various stoichimetries and gradient coating were prepared by cathodic arc evaporation. The chemical analysis was carried out by X-ray photoelectron spectroscopy (XPS). The crystallographic structure was investigated by X-ray diffraction (XRD). The composition, structure of the coatings varied as a function of nitrogen pressure. The potentiodynamic polarization was examined by Zahner IM6e electrochemical workstation, and the corrosive surface was detected by scanning electron microscopy (SEM). The results showed that the graded coating had an better electrochemical performance than duplex CrN coating. The relationship of microstructure and properties was studied, and a model of gradient CrN coating was constituted.

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周慶剛 白新德 陳小文 凌云漢 彭德全.氮化鉻梯度膜的制備和電化學(xué)性能研究[J].稀有金屬材料與工程,2004,33(6):666~669.[Zhou Qinggang, Bai Xinde, Chen Xiaowen, Ling Yunhan, Peng Dequan. Preparation and Electrochemical Properties of Gradient CrNx Coatings on H13 Steel[J]. Rare Metal Materials and Engineering,2004,33(6):666~669.]
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