An active corrosion mechanism for metal dusting on 304L stainless steel

• A mechanism for metal dusting of chromia-forming stainless steels is proposed, based on results from laboratory exposures of 304L stainless steel at 650 degreesC for 1000 h in a synthesis gas low in water vapour, 25%CO + 3%H2O + H. The work focuses on the role of carbides and oxygen to explain the different corrosion mechanisms and give a description of the metal dusting phenomenon as it appears in engineering alloys. Metallographical examinations, FEG-SEM, SEM-EDX analysis and X-ray diffraction, as well as thermodynamic calculations were made in order to identify the proposed metal dusting mechanism.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

stainless steel

high temperature corrosion

metal dusting

oxidation

carburisation

carbides

thermodynamic modelling

diffusion

kinetics

mechanisms

ni-base alloys

Materials science

Teknisk materialvetenskap

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)