Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993772 | Journal of Alloys and Compounds | 2018 | 9 Pages |
Abstract
Thin Cr-Nb-N films with Nb content ranging from 5.1 to 19.5Â at.% were prepared onto the AISI 440C substrates by reactive magnetron sputtering of the Cr and Nb in Ar-N2 gas mixture. The effects of the Nb content on the microstructure and the corrosion behavior in 3.5Â wt% NaCl solution were investigated. All the deposited films showed a typical surface feature of granular structure. The Cr-Nb-N films with 5.1Â at.% and 10.9Â at.% Nb showed a duplex layers consisting of a dense and coherent layer near film-substrate interface, followed by a columnar layer differed from the uniform columnar structure for pure CrN. While for Cr-Nb-N films with higher Nb content, there was no obvious dense layer but a columnar structure. The low Nb content Cr-Nb-N coated samples showed a positive shift of both corrosion potential and the pitting potential compared to the pure CrN coated sample while the pitting potential decreased for high Nb content Cr-Nb-N coated samples. The Cr-Nb-N film with Nb content of 10.9Â at.% possesses the best corrosion resistance due to the high polarization resistance resulted from the modification of the microstructure by the Nb incorporation.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Desheng Wang, Yanlong Fu, Ming Hu, Dong Jiang, Xiaoming Gao, Qinqin Wang, Jun Yang, Jiayi Sun, Lijun Weng,