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Materials 2014, 7(4), 2882-2889; doi:10.3390/ma7042882

Hot Corrosion Behavior of Sputtered Nanocrystalline Coating with Yttrium Addition at 900 °C

2,* , 2
Received: 18 December 2013 / Revised: 4 March 2014 / Accepted: 1 April 2014 / Published: 9 April 2014
(This article belongs to the Special Issue Corrosion of Materials)
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The high temperature corrosion behavior of sputtered nanocrystalline K38 coating with and without yttrium addition under mixed molten salt film in air was investigated. Accelerated corrosion occurred on the coating without yttrium (Y) addition locally after 60 h exposure at 900 °C, which resulted in negative weight gain in kinetics. A uniform and protective alumina scale formed on surface of the coating containing yttrium in comparison. Y enriched particle as corrosion product was observed on the top of alumina scale. The results indicated the beneficial influence of Y on the chemical stability of the protective scale in the presence of chloride. The mechanism was discussed.
Keywords: nanocrystalline coating; sputtering; yttrium; hot corrosion nanocrystalline coating; sputtering; yttrium; hot corrosion
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Jiang, W.; Yu, P.; Wang, W.; Zhu, S.; Wang, F. Hot Corrosion Behavior of Sputtered Nanocrystalline Coating with Yttrium Addition at 900 °C. Materials 2014, 7, 2882-2889.

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