Corrosion behaviour of 2205 DSS in the artificial industrial-marine environment

ABSTRACT

The corrosion behavior of 2205 duplex stainless steel (2205 DSS) was investigated by atomization tests, which was performed in an S-bearing thin electrolyte layer used as the artificial industrial-marine environment. Electrochemical methods and X-ray photoelectron spectroscopy (XPS), were conducted to reveal the protection properties and the composition evolution of the passive film. The results indicated that the corrosion time would weak the protectiveness of passive film, which was attributed to the accumulation of defects and metal sulfides in the passive film. The decrease of composition percentage of Cr₂O₃ made more negative effects on the protection properties of passive film than the increase of Cr(OH)₃ and CrO₃, whose formation was related to the adequate supply of oxygen and water molecules. The metal sulfides such as NiS and MoS₂ formed during atomization tests reduced the content of alloy oxides in the passive film, and provided locations for the growth of defects.

KEYWORDS:

• Corrosion behaviour
• metal sulfides;defects
• Cr₂O₃

Acknowledgements

This work was supported financially by the National Environmental Corrosion Platform.

Disclosure statement

No potential conflict of interest was reported by the author(s).