In-situ synchrotron GIXRD study of passive film evolution on duplex stainless steel in corrosive environment

• This paper presents new findings about the passive film formed on super duplex stainless steel in ambient air and corrosive environments, studied by synchrotron grazing-incidence X-ray diffraction (GIXRD). The passive film, formed in air, was seen to be a nano-crystalline mixed-oxide. Electrochemical polarisation to the passive region in aqueous 1 M NaCl at room temperature resulted in an increase of the passive film thickness, preferential dissolution of Fe, and partial loss of crystallinity. After termination of polarization to the transpassive regime, reformation of the mixed-oxides was observed, showing a thicker, semi-crystalline, and more defective nature (more vacancies) with further new oxides/hydroxides.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Korrosionsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Corrosion Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

Nyckelord

De-alloying

Duplex stainless steel

Grazing-incidence X-ray diffraction (GIXRD)

Oxide film

Passivity

Selective dissolution

Crystalline materials

Dealloying

Dissolution

Oxide films

Polarization

Sodium chloride

Steel corrosion

X ray diffraction

Corrosive environment

Electrochemical polarisation

Grazing-incidence X-ray diffraction

Preferential dissolution

Super duplex stainless steel

Stainless steel

De-alloying

Duplex stainless steel

Grazing-incidence X-ray diffraction (GIXRD)

Oxide film

Passivity

Selective dissolution

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)