Hot corrosion behavior of CM 247 LC alloy in Na2SO4 and NaCl environments

被引：85

作者：

Gurrappa, I ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

来源：

OXIDATION OF METALS | 1999年 / 51卷 / 5-6期

关键词：

superalloy; hot corrosion; electrochemical model;

D O I：

10.1023/A:1018831025272

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Hot corrosion studies of CM 247 LC alloy were carr icd out in pure sodium sulfate, as well as sodium chloride and sodium sulfate mixtures of different concentrations at various temperatures. A crucible test was employed to study the suitability of CM 247 LC as a gas turbine blade material. It was observed that bare CM 247 LC was severely , corroded in just 4 hr, while it was completely consumed in 70 hr when tested in 90% Na2SO4+10% NaCl at 900 degrees C, The results show that a chloride containing melt is more corrosive than pure sodium sulfate. The weight loss is linearly related to t(1/2) (time) and temperature in the different environments studied The corroded samples ere characterized by EPMA, SEM, XRD, and metallographic techniques, The results skew that hot corrosion of CM 247 LC is an electrochemical phenomenon.

引用

页码：353 / 382

页数：30

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