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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

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Hardness, toughness and electrochemical properties of Cr-N coating by ion beam enhanced deposition
Tang Bin(唐宾); Zhu Xiaodong(朱晓东); He Jianwen(何家文)

State Key Laboratory for haanical Behaviour of Materials; Xi’an Jiaotong University; Xi’an 710049; P. R. ChinaResearch Institute of Surface Engineering;
Taiyuan University of Technology; Taiyuan 030024; P. R. China

Abstract:The hardness, toughness and electrochemical properties of the CrN coatings were studied by the method of Ion Beam Enhanced DePosition(IBED). The results show that the fraction of CrN phase and its hardness increase with increasing N2 partial pressure and N ions bombarding energy in a certain range, but the toughness decreases. When the N ions: Cr atoms ratio changes from 1. 45 × 1O-2, 3. 67 × 10-2 to 5. 87 ×10 - 2, Cr2O3 is produced. In terms of corrosion resistance, the coated specimen shows a slight improvement in comparison with substrate 52100 steel. The Cr-N coated specimen is characterized with pitting corrosion by penetrating the agent throngh the defects involved very thin coating layer.

 

Key words:  Cr-N; coating; hardness; toughness; electrochemistry

ISSN 1672-7029
CN 43-1423/U

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