Effect of water drops on the oxidation mechanisms of a ceria coated nickel-based superalloy

被引：24

作者：

Bouchaud, B. ^{[1
]}

Balmain, J. ^{[1
]}

Barrere, D. ^{[1
]}

Delannoye, T. ^{[1
]}

Pedraza, F. ^{[1
]}

机构：

[1] Univ La Rochelle, Lab Sci Ingenieur Environm, CNRS, LaSIE FRE 3474, F-17042 La Rochelle 01, France

来源：

CORROSION SCIENCE | 2013年 / 68卷

关键词：

Superalloys; Oxide coatings; Rare-earth elements; Electrodeposited films; Oxidation; Raman Spectroscopy; THERMAL BARRIER COATINGS; ALUMINIDE DIFFUSION COATINGS; SINGLE-CRYSTAL SUPERALLOY; HIGH-TEMPERATURE OXIDATION; ISOTHERMAL OXIDATION; BEHAVIOR; VAPOR; SPALLATION; MOISTURE; SCALES;

D O I：

10.1016/j.corsci.2012.11.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of the addition of water drops on the oxidation mechanisms of ceria coatings generated by cathodic electrodeposition onto a Ni-based superalloy was studied for short isothermal tests (50 h) between 900 degrees C and 1100 degrees C. Correlations between the oxidation kinetics and the growth mechanisms of the oxide scales were drawn and compared to conventional aluminide coating. The phase transformations were highlighted using Raman micro-spectrometry in combination with X-ray diffraction and SEM-EDS. Delayed transformation of theta-Al2O3, the appearance of pores and spallation occurred onto aluminides and the chemical inertness of ceria and the critical role of pre-oxidation was demonstrated. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：176 / 185

页数：10

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