Journal
APPLIED SURFACE SCIENCE
Volume 423, Issue -, Pages 695-703Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.06.099
Keywords
Chromium coating; Aerospace bearing steel; M50NiL; CSS-42L; Corrosion behavior
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Funding
- National Natural Science Foundation of China [NSFC 51471012]
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The corrosion protection of chromium coating deposited on aerospace bearing steels by using the Filtered Cathodic Vacuum Arc deposition- Metal Evaporation Vacuum Arc duplex technique (MEVVA-FCVA) had been investigated. The protection efficiency of chromium coating on different substrate materials had also been evaluated. The chromium coating was mainly composed of nanocrystalline alpha-Cr in a range of 50-200 nm. The orientation distributions of alpha-Cr film on substrates with different composition had a certain difference to each other. Electrochemical experimental results indicated that the chromium coating significantly improved the corrosion resistance of experimental bearing steels in 3.5% NaCl solution. The protective efficiency of chromium films were all over 98%. The corrosion resistance of chromium coating was influenced by the chemical composition of substrate material. The chromium coatings on higher Cr-containing substrate displayed lower corrosion current density and more positive corrosion potential. The increase of passive film thickness and the formation of a mass of chromium oxide and hydroxide on the surface are responsible for the improved corrosion properties. (C) 2017 Elsevier B.V. All rights reserved.
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