Oxidation Behavior of Ni-Cr Alloys in CO2 at 700 °C

被引：22

作者：

Thuan Dinh Nguyen ^{[1
]}

Xie, Yun ^{[1
]}

Ding, Shijie ^{[1
]}

Zhang, Jianqiang ^{[1
]}

Young, David J. ^{[1
]}

机构：

[1] Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

来源：

OXIDATION OF METALS | 2017年 / 87卷 / 5-6期

基金：

澳大利亚研究理事会;

关键词：

Nickel-chromium alloy; Carburization; Oxidation; High-temperature corrosion; DIFFUSION; NICKEL; OXYGEN;

D O I：

10.1007/s11085-017-9721-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Model alloys Ni-(5, 10, 20, 25, 30 wt%)Cr were exposed to Ar-20CO(2) and Ar-20O(2) at 700 degrees C. Samples were electropolished before reaction to avoid cold-working effects and, as a result, to reveal the effect of alloy bulk diffusion. All alloys underwent breakaway oxidation in CO2, forming an external Ni-rich oxide scale and other oxides internally. In oxygen, the Ni-(5, 10, 20)Cr alloys formed a nonprotective Ni-rich scale plus an internal oxidation zone, but Ni-(25, 30)Cr formed a protective Cr2O3 scale. Carbide precipitates were found in Ni-20Cr reacted in CO2. It is shown that Wagner's diffusion theory accounts satisfactorily for the difference in alloy scaling behavior in the two gases.

引用

页码：605 / 616

页数：12

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