Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 9 No. 4 December 1999|
（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