AVS 47th International Symposium
    Surface Engineering Tuesday Sessions
       Session SE-TuP

Paper SE-TuP15
The Corrosion Resistance of the Chromium Nitride on Carbon Steel by Cathodic Arc Deposition

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: S. Han, National Chung Hsing University, Taiwan, ROC
Authors: S. Han, National Chung Hsing University, Taiwan, ROC
J.H. Lin, National Tsing Hua University, Taiwan, ROC
S.C. Chung, Industrial Technology Research Institute, Taiwan, ROC
S.H. Tsai, National Tsing Hua University, Taiwan, ROC
F.H. Lu, National Chung Hsing University, Taiwan, ROC
H.C. Shih, National Tsing Hua University, Taiwan, ROC
Correspondent: Click to Email
The electrochemical behavior of CrN coating on steel is investigated. The CrN coatings are deposited using a reactive cathodic arc plasma deposition technology in an industrial scale. The microstructure and crystalline of chromium nitride have been investigated using XRD, XTEM and SAD. The CrN coatings exhibit microcolumnar morphologies. The aqueous corrosion behavior of the coatings was studied in a saline (3% NaCl solution) environment by OCP and EIS measurements. The OCP measurements indicated that the CrN coatings are nobler than the uncoated substrate. The R @sub p@ of the CrN coatings is at least an order of magnitude larger than the uncoated alloy steel. Moreover, the R @sub p@ of the CrN coatings tends to decrease with immersion duration, showing that the corrosion changes from charge transfer to diffusion control process especially when the immersion time is long enough.