Effect of Minor Nb on Isothermal-Oxidation and Hot Corrosion Behavior of Two Nickel-Based Superalloys Under Na2SO4/Na2SO4-NaCl-Reference-Cited by-同舟云学术

Effect of Minor Nb on Isothermal-Oxidation and Hot Corrosion Behavior of Two Nickel-Based Superalloys Under Na2SO4/Na2SO4-NaCl

Published:2021-05-24 Issue:9 Volume:77 Page:949-960
ISSN:0010-9312
Container-title:Corrosion
language:en
Short-container-title:

Author:

Zhou Yuebo¹²,Wang Hong¹,Mo Chenggang¹,Zhang Lina¹

Affiliation:

1. School of Mechanical Engineering and Automation, Shenyang Institute of Technology, Fushun 113122, People’s Republic of China.

2. Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine, Shenyang Institute of Technology, Fushun 113122, People’s Republic of China.

Abstract

Two nickel-based superalloys with and without minor Nb were prepared using double vacuum melting. The comparison of microstructure, isothermal-oxidation, and hot corrosion behavior under molten Na2SO4/Na2SO4+25 wt% NaCl at 900°C was evaluated. Results indicated that Nb accelerated the formation of chromia scale in a short transient stage, leading to a lower scaling rate. Nb also inhibited the internal oxidation/nitridation. Both significantly improved the hot corrosion resistance under Na2SO4. However, the beneficial effect of Nb is slight under mixed salts with NaCl. The beneficial effects of Nb on oxidation and hot corrosion are discussed in detail.

Publisher

NACE International

Subject

General Materials Science,General Chemical Engineering,General Chemistry

Link

http://meridian.allenpress.com/corrosion/article-pdf/77/9/949/2894537/3732.pdf

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