Reaction morphologies developed by nickel aluminides in type II hot corrosion conditions: The effect of chromium

被引：41

作者：

Gheno, Thomas ^{[1
]}

Azar, Maryam Zahiri ^{[2
]}

Heuer, Arthur H. ^{[2
]}

Gleeson, Brian ^{[1
]}

机构：

[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[2] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA

来源：

CORROSION SCIENCE | 2015年 / 101卷

关键词：

Molten salts; Nickel; Hot corrosion; Selective oxidation; Sulphidation; COBALT-BASE ALLOYS; FUSED NA2SO4; ACCELERATED OXIDATION; SULFATE; OXIDES; BEHAVIOR; NI; CR; THERMODYNAMICS; SOLUBILITIES;

D O I：

10.1016/j.corsci.2015.08.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The short-term reaction of Ni-36Al (at. %) and Ni-36Al-5Cr alloys with Na2SO4 in O-2-0.1% SO2 at 700 degrees C was studied by SEM and TEM. Local failure of the protective scale on NiAl led to nodule development via internal oxidation. Conversely, NiAlCr underwent a uniform attack involving internal sulfidation, porous scale growth, and NiO and Al2O3 dissolution into the sulfate. The roles of gas and sulfate compositions were studied by comparing exposures to Na2SO4, Na2SO4-MgSO4 and Na2SO4-Cr2O3 deposits in air and O-2-0.1% SO2. The effect of Cr in preventing passivation during early-stage exposure was associated with a coupled dissolution of NiO and Cr2O3. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：32 / 46

页数：15

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