Abstract
It is well known that water vapour accelerates oxidation;
however different gas conditions and material
compositions affect the mechanism. The paper addresses
this issue from two different application areas; biomass
and kraft recovery boilers. In these applications water
vapour and sulphur are simultaneously affecting the
corrosion mechanism, though the mechanisms are different.
Low-alloyed steels were exposed to an atmosphere
containing different amounts of water vapour at
temperatures of 420, 550 and 600°C. Under oxidising
conditions increasing water content generally accelerates
oxidation. However, presence of SO2 in moist atmosphere
retards oxidation at high temperatures. The phenomenon is
seen at low temperatures with higher chromium contents.
Stainless steel 304L was tested in an atmosphere
containing hydrogen sulphide and carbon monoxide with and
without water vapour at a temperature of 440°C to
simulate elevated kraft recovery boiler furnace
conditions. The tests showed that water vapour in the
test atmosphere produces a protective spinel oxide on the
metal surface. In tests without water vapour, the initial
scales at metal surface were different sulphur compounds
and intensive sulphidation occurred. The effect of water
vapour on the sulphidation mechanism is addressed in the
paper through the described tests and thermodynamic
modelling.
Original language | English |
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Title of host publication | 7th International Symposium on High Temperature Corrosion and Protection of Materials, HTCPM 2008 |
Subtitle of host publication | Selected, peer reviewed papers. Part 2 |
Editors | Pierre Steinmetz |
Publisher | Trans Tech Publications |
Pages | 841-849 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A4 Article in a conference publication |
Event | 7th International Symposium on High-Temperature Corrosion and Protection of Materials, HTCPM 2008 - Les Embiez, France Duration: 18 May 2008 → 23 May 2008 Conference number: 7 |
Publication series
Series | Materials Science Forum |
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Number | 595-598 |
ISSN | 0255-5476 |
Conference
Conference | 7th International Symposium on High-Temperature Corrosion and Protection of Materials, HTCPM 2008 |
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Abbreviated title | HTCPM 2008 |
Country/Territory | France |
City | Les Embiez |
Period | 18/05/08 → 23/05/08 |