KCl-Induced Corrosion of the FeCrAl Alloy Kanthal® AF at 600°C and the Effect of H2O

• The present study investigates the influence of H2O and KCl on the high-temperature corrosion of the FeCrAl alloy Kanthal(A (R)) AF. Polished samples, with and without applied KCl, were exposed isothermally to O-2 or O-2 + H2O at 600 A degrees C. The samples were investigated using TGA, XRD, SEM/EDX, AES and IC. It was found that KCl accelerates corrosion and that a rapidly growing iron, chromium-rich oxide forms in both environments. Chromate formation and alloy chlorination are shown to initiate the formation of non-protective oxide scales. In addition, aluminium nitrides form in the alloy substrate in both environments.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

KCl

FeCrAl

Water vapour

High temperature corrosion

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