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Metals 2016, 6(2), 29;

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Department of Advanced Materials Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea
Author to whom correspondence should be addressed.
Academic Editor: Ana Sofia Ramos
Received: 6 December 2015 / Revised: 22 January 2016 / Accepted: 27 January 2016 / Published: 29 January 2016
(This article belongs to the Special Issue Intermetallics 2016)
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The current study involves the coating of Titanium-Zirconium-Molybdenum (TZM) alloy with FeCrAl through plasma thermal spraying which proved effective in improving the oxidation resistance of the substrate. A post-laser surface melting treatment further enhanced the surface protection of the TZM alloy. Oxidation tests conducted at 1100 °C in air indicated that some Mo oxides were formed at the surface but a relatively small amount of weight reduction was observed for FeCrAl-coated TZM alloys up to 60 min of treatment. The post-laser surface treatment following the plasma thermal spray process apparently delayed the severe oxidation process and surface spalling of the alloy. It was suggested that the slow reduction in weight in the post-laser-treated specimen was related to fewer defects in the coating layer. It was also found that a surface reaction layer formed through the diffusion of Fe into the Mo alloy substrate at high temperature. The layer mainly consisted of Fe-saturated Mo and FeMo intermetallic compounds. In order to observe the corrosion behavior of the laser-treated alloy in 3.5% NaCl solution, electrochemical characteristics were also investigated. A proposed equivalent circuit model for the specimen indicated localized corrosion of coated alloy with some permeable defects in the coating layer. View Full-Text
Keywords: Mo alloy; FeCrAl; plasma thermal spray; laser treatment Mo alloy; FeCrAl; plasma thermal spray; laser treatment

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Kim, J.-M.; Ha, T.-H.; Park, J.-S.; Kim, H.-G. Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy. Metals 2016, 6, 29.

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