Oxidation After Breakdown of the Chromium-Rich Scale on Stainless Steels at High Temperature: Internal Oxidation

被引：71

作者：

Jonsson, T. ^{[1
]}

Karlsson, S. ^{[1
]}

Hooshyar, H. ^{[1
]}

Sattari, M. ^{[1
]}

Liske, J. ^{[1
]}

Svensson, J. -E. ^{[1
]}

Johansson, L. -G. ^{[1
]}

机构：

[1] Chalmers, Dept Chem & Chem Engn, Environm Inorgan Chem, S-41296 Gothenburg, Sweden

来源：

OXIDATION OF METALS | 2016年 / 85卷 / 5-6期

关键词：

Oxidation; Breakaway corrosion; 304L; Alkali; Water vapour; Internal oxidation; TEM; WATER-VAPOR; FE-CR; IRON OXIDATION; FLOW-RATE; ALLOYS; 600-DEGREES-C; DIFFUSION; CORROSION; OXIDES; H2O;

D O I：

10.1007/s11085-016-9610-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Breakaway oxidation of alloy 304L at 600 degrees C was studied in four environments (O-2 + H2O + KCl, O-2 + H2O + SO2 + KCl, H-2 + H2O + Ar, O-2 + K2CO3) for up to 168 h. The resulting scales were investigated by FIB/SEM, SEM/EDX, STEM/EELS, STEM/EDS and oxidation was elucidated by thermodynamic calculations (Thermo-Calc). The initial thin protective scale broke down in all cases. After breakaway, the scale consisted of two layers, i.e. an inward growing spinel/reaction zone and an outward growing iron-rich layer. The general features and microstructure of the scales after breakaway were similar in all environments and were explained in terms of: (1) Different diffusivities of Cr3+ and Fe2+ in the spinel oxide. (2) The appearance of a miscibility gap in the FeCr and FeCrNi spinel oxides. (3) The equilibrium composition of the spinel (at low pO(2) Ni is not present in the spinel).

引用

页码：509 / 536

页数：28

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