Title

CHARACTERIZATION OF FILM AFTER IMMERSION TEST IN INDUSTRIAL WHITE LIQUOR

Authorship

ESTEVES, LUIZA; GASTELOIS, PEDRO LANA; CAMPOS, WAGNER REIS DA COSTA; LINS, VANESSA FREITAS CUNHA; MACEDO, WALDEMAR AUGUSTO DE ALMEIDA; GARCIA, JOÃO HENRIQUE NERY

ESTEVES, LUIZA

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GASTELOIS, PEDRO LANA

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CAMPOS, WAGNER REIS DA COSTA

I am this author

LINS, VANESSA FREITAS CUNHA

I am this author

MACEDO, WALDEMAR AUGUSTO DE ALMEIDA

I am this author

GARCIA, JOÃO HENRIQUE NERY

I am this author

DOI

10.5151/1516-392X-30842

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Abstract

Corrosion testing was performed in white liquor from a Brazilian Kraft mill. Specimens of duplex stainless steel (DSS) and lean duplex (LDSS) were exposed at 170 °C for 30 days to simulate conditions of the digester. Corrosion rates were determined from weight loss measurements. After this exposure, the corrosion products formed on the steel surface was characterized by using scanning electron microscope (SEM) equipped with EDS, X-Ray Diffraction (XRD), and X-ray photoelectron spectrometer (XPS). EBSD can be used to quantify of basis balance phases in DSS and LDSS. General corrosion rates for UNS S32304 LDSS were higher than the UNS 31803 DSS in industrial white liquor at 170 °C for 30 days. XPS and XRD analyses indicated that the film formed after the immersion test may be consisted by Fe and Cr oxides and sulphides.

Keywords

Duplex stainless steels, Weight loss, Industrial white liquor, Autoclave

Autoclave