Article history: The corrosion behavior of three HVAF thermal spray coating systems (A: single-layer Ni, B: single-layer Received 13 November 2015 Cr C –NiCr coatings, and C: bi-layer Ni/Cr C –NiCr coating) was comparatively studied using immersion, 2 3 2 3 Received in revised form 19 January 2016 salt spray, and electrochemical tests. Polarization and EIS results showed that the corrosion behavior of Accepted 1 February 2016 Cr C –NiCr coatings in 3.5 wt.% NaCl solution was signiﬁcantly improved by adding the intermediate 2 3 Available online 3 February 2016 layer of Ni. It was illustrated that the polarization resistance of the bi-layer Ni/Cr C –NiCr and single- 2 3 layer Cr C –NiCr coatings were around 194 and 38 k cm , respectively. Microstructure analysis revealed 2 3 Keywords: that the bond coating successfully prevented the corrosion propagation toward the coating. Thermal spray © 2016 Elsevier B.V. All rights reserved. HVAF Corrosion EIS Polarization Immersion test 1. Introduction High-velocity air/fuel (HVAF) is an emerging high kinetic ther- mal spray technique which has received increased attention mostly Multifunctional multilayer systems are commonly used in many as a better replacement to electrolytic hard chromium (EHC) industrial applications including aerospace, automotive,
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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