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

Materials

Wei Jiang¹  Ping Yu²  Wen Wang³  Shenglong Zhu³ 

[1] School of Materials and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; E-Mail:;College of chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China; E-mail:;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; E-Mails:

关键词: nanocrystalline coating;    sputtering;    yttrium;    hot corrosion;   

DOI  :  10.3390/ma7042882

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland