A study on corrosion resistance characteristics of PVD Cr-N coated steels by electrochemical method
A study on corrosion resistance characteristics of PVD Cr-N coated steels by electrochemical method
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DOI：
10.1016/s0257-8972(01)01529-8
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发表时间：
2002-02-15
影响因子：
5.4
通讯作者：
Han, JG
中科院分区：
文献类型：
--
作者：
Ahn, SH;Choi, YS;Han, JG
研究了AISI H13钢阴极电弧沉积不同相(α-Cr、CrN和Cr2N)的铬氮涂层钢在3.5%的氯化钠溶液中的常温腐蚀行为。采用动电位极化测试、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)对腐蚀行为进行了表征。动电位极化测试结果表明，CrN涂层具有较低的电流密度。Cr2N涂层的孔隙率高于其他铬氮涂层钢，对应于未涂层和涂层衬底的极化电阻之比。交流阻抗谱测量表明，对于大多数铬氮涂层钢，Bode图呈现两个时间常数。Cr2N涂层在浸泡72it后表现出明显的Warburg行为特征。用扫描电子显微镜观察了涂层的平面图和横截面形貌，并与电化学测试结果进行了比较。结果表明，CrN涂层具有致密的柱状晶组织和少量的晶间孔洞。综合以上结果可知，CrN涂层的耐腐蚀性能优于其它铬氮涂层钢。(C)2002 Elsevier Science B.V.保留所有权利。
The corrosion behavior of Cr-N coated steels with different phases (alpha-Cr, CrN and Cr2N) deposited by cathodic arc deposition on AISI H13 steel was investigated in a 3.5% NaCl solution at ambient temperature. Potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were the techniques applied to characterize the corrosion behavior. It was found that the CrN coating had a lower current density from potentiodynamic polarization tests than others. The porosity, corresponding to the ratio of the polarization resistance of the uncoated and the coated substrate, was higher in the Cr2N coating than in the other Cr-N coated steels. EIS measurements showed, for most of the Cr-N coated steels, that the Bode plot presented two time constants. Also, the Cr2N coating represented the characteristic of Warburg behavior after 72 It of immersion. The coating morphologies were examined in planar view and cross-section by SEM analysis and the results were compared with those of the electrochemical measurements The CrN coating had a dense, columnar grain-sized microstructure with minor intergranular porosity. From the above results, it is concluded that the CrN coating provided a better corrosion protection than the other Cr-N coated steels. (C) 2002 Elsevier Science B.V. All rights reserved.