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论文类型：期刊论文

发表时间：2008-06-19

发表刊物：VACUUM

收录刊物：SCIE、EI

卷号：82

期号：11

页面范围：1332-1336

ISSN号：0042-207X

关键字：CrN(Zr) coatings; DC magnetron sputtering; nanocrystalline; corrosion

摘要：Zirconium modified chromium nitride coatings with various Zr contents have been prepared by a DC reactive magnetron sputtering technique. The detailed investigations in terms of composition, phase structure, morphology and corrosion properties have been performed by GDOES, XRD, SEM and electrochemical measurements, respectively. The as-deposited coatings with Zr contents ranging from 0 to 3.2 at. % form nanocrystalline solid solutions, where Zr substitute Cr in the CrN lattice. With increasing Zr contents, the lattice parameters increase but the grain sizes show little effects. All the coatings exhibit dense compact columnar structures in SEM cross-sectional observations. Electrochemical measurements in 3.5% NaCl solutions revealed that the additions of Zr into CrN coatings improved their chemical inertness. The coated samples with much low corrosion current densities in nA/cm(2) range show their excellent protective characteristics to the stainless steel substrates. The corrosion mechanism, however, was due to the slight pitting corrosions, which were mainly localized in the growth defects. (c) 2008 Elsevier Ltd. All rights reserved.