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Influence of interlayers on corrosion resistance of diamond-like carbon coating on magnesium alloy
- Source :
-
Surface & Coatings Technology . Apr2010, Vol. 204 Issue 14, p2193-2196. 4p. - Publication Year :
- 2010
-
Abstract
- Abstract: Diamond-like carbon coating (DLC) was deposited on AZ31 magnesium alloy by ion beam deposition technique in this study. A columnar Cr layer with a (110) preferred texture and a columnar CrN layer with a (111) preferred texture were applied as interlayers in the DLC coating/AZ31 substrate systems. The addition of these interlayers improved the adhesion between coating and substrate effectively, but did not enhance the corrosion resistance of the DLC/AZ31 systems due to the formation of galvanic cell between substrate and interlayer in the region of through-thickness defects in 3.5wt.% NaCl solution. In addition, the effect of bias voltage on the corrosion resistance of CrN/Cr coatings on magnesium alloys was investigated. Although the application of bias voltage induced the coating denser, it was still difficult for CrN/Cr coating to reduce the corrosion current density of AZ31 due to the large difference between coating and substrate in galvanic series. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02578972
- Volume :
- 204
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Surface & Coatings Technology
- Publication Type :
- Academic Journal
- Accession number :
- 48117690
- Full Text :
- https://doi.org/10.1016/j.surfcoat.2009.12.009