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51315-5746-Role of Alloying Elements and Ageing in the Pitting Corrosion Resistance of Duplex Stainless Steels

Picture for Role of Alloying Elements and Ageing in the Pitting Corrosion Resistance of Duplex Stainless Steels
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Product Number: 51315-5746-SG
ISBN: 5746 2015 CP
Author: Sandra Le Manchet
Publication Date: 2015
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Duplex stainless steels (DSS) are highly important engineering materials due to their high corrosion resistance combined with high strength and moderate alloy cost (lower nickel and molybdenum content) compared to standard austenitic grades. They are widely used in various industrial sectors such as oil & gas (pipelines and storage tanks) desalination (evaporators and pumps) and pulp and paper (digester and bleaching reactors) industries. In this paper the influence of the alloying elements and long-term ageing on the DSS localized corrosion resistance was investigated in a sodium chloride solution.Various DSS grades were considered. The properties of the native passive films spontaneously formed on the ferrite and the austenite in air (after surface preparation) were determined by means of local Auger and XPS measurements. Several parameters were used to characterize these native passive films: thickness O2-/OH- ratio Cr/Fe ratio profiles of nickel nitrogen and manganese. Similar analyses were performed after a 3-week ageing in 0.5M NaCl (30°C/86°F) at the OCP. The role of alloying elements was then discussed considering the ageing conditions and the microstructure of the specimens.CPT measurements were carried out at the local scale in both phases to determine the localized corrosion resistance of each DSS grade (after surface preparation and long-term ageing). These measurements were conducted using the electrochemical microcell technique (capillary diameter between 30 and 50 µm) coupled with a Peltier heating stage. The results obtained were discussed considering the microstructure ageing conditions and the properties of the passive films.Keywords: duplex stainless steel passivity corrosion ageing CPT XPS Auger local techniques

Duplex stainless steels (DSS) are highly important engineering materials due to their high corrosion resistance combined with high strength and moderate alloy cost (lower nickel and molybdenum content) compared to standard austenitic grades. They are widely used in various industrial sectors such as oil & gas (pipelines and storage tanks) desalination (evaporators and pumps) and pulp and paper (digester and bleaching reactors) industries. In this paper the influence of the alloying elements and long-term ageing on the DSS localized corrosion resistance was investigated in a sodium chloride solution.Various DSS grades were considered. The properties of the native passive films spontaneously formed on the ferrite and the austenite in air (after surface preparation) were determined by means of local Auger and XPS measurements. Several parameters were used to characterize these native passive films: thickness O2-/OH- ratio Cr/Fe ratio profiles of nickel nitrogen and manganese. Similar analyses were performed after a 3-week ageing in 0.5M NaCl (30°C/86°F) at the OCP. The role of alloying elements was then discussed considering the ageing conditions and the microstructure of the specimens.CPT measurements were carried out at the local scale in both phases to determine the localized corrosion resistance of each DSS grade (after surface preparation and long-term ageing). These measurements were conducted using the electrochemical microcell technique (capillary diameter between 30 and 50 µm) coupled with a Peltier heating stage. The results obtained were discussed considering the microstructure ageing conditions and the properties of the passive films.Keywords: duplex stainless steel passivity corrosion ageing CPT XPS Auger local techniques

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