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

共 50 条

[1] PHASE-TRANSITIONS AND IONIC-CONDUCTIVITY OF THE NA2SO4-MGSO4 SYSTEM [J].

BANDARANAYAKE, PWSK ;

MELLANDER, BE .

SOLID STATE IONICS, 1990, 40-1 :31-33

[2]

Barin I., 2008, Thermochemical Data of Pure Substances, VThird

[3]

Birks N, 2006, INTRODUCTION TO THE HIGH-TEMPERATURE OXIDATION OF METALS, 2ND EDITION, P1, DOI 10.1017/CBO9781139163903

[4] THE OXIDATION OF NIAL .3. INTERNAL AND INTERGRANULAR OXIDATION [J].

BRUMM, MW ;

GRABKE, HJ ;

WAGEMANN, B .

CORROSION SCIENCE, 1994, 36 (01) :37-53

[5] FORMATION AND REACTIVITY THERMODYNAMICS OF SODIUM SULFATE WITH GAS TURBINE ALLOYS [J].

DECRESCE.MA ;

BORNSTEI.NS .

CORROSION, 1968, 24 (05) :127-&

[6] Thermodynamic re-assessment of the ternary system Al-Cr-Ni. [J].

Dupin, N ;

Ansara, I ;

Sundman, B .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2001, 25 (02) :279-298

[7]

ELLIS DL, 1993, CR191082 NASA

[8] Solubility of metal oxides under control of basicity by electrolysis in fused Na2SO4 [J].

Fukumoto, M ;

Suzuki, T ;

Sano, M ;

Hirade, M ;

Hara, M .

MATERIALS TRANSACTIONS, 2004, 45 (10) :2994-2998

[9]

Gesmundo F., 1989, High Temp.Mater. Processes, V8, P149, DOI [10.1515/HTMP.1989.8.3.149, DOI 10.1515/HTMP.1989.8.3.149]

[10]

Gheno T., 2015, OXID MET

← 1 2 3 4 5 →