Corrosion of Ni-W Coatings in SO2 Atmosphere between 500 and 700 °C

Dong Bok Lee; J.H. Ko

doi:10.4028/www.scientific.net/MSF.486-487.169

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HomeMaterials Science ForumMaterials Science Forum Vols. 486-487Corrosion of Ni-W Coatings in SO2 Atmosphere...

Corrosion of Ni-W Coatings in SO₂ Atmosphere between 500 and 700 °C

Abstract:

The Ni-19at.%W coating was electodeposited to protect the stainless steel substrate, and then corroded between 500 and 700oC in Ar-0.2% SO2 atmosphere for 5 hr. The coating effectively protected the substrate from corrosion at 500oC, but failed at 700oC owing to serious corrosion. The corrosion products were mainly NiO, WO3 and NiWO4, together with some NiS, FeS, Fe2O3 and FeWO4. Detailed scale morphologies and corrosion mechanism are presented.

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Periodical:

Materials Science Forum (Volumes 486-487)

Pages:

169-172

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.486-487.169

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Online since:

June 2005

Authors:

Dong Bok Lee, J.H. Ko

Keywords:

Coating, Corrosion, Nickel-Tungsten, Oxidation, Sulfidation

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References

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[10] [20] [30] [40] [50] [60] [70] Sputter Time (min) Concentration (at%) O Ni W Pt Ni Fig. 5. AES spectrum Ni-19W coating after corrosion in Ar-0. 2%SO2 at 700°C for 2 min. 40μm substrate epoxy scale 40μm substrate epoxy scale Fig. 6. Cross-sectional SEM image of stainless steel substrate after corrosion at 700°C for 5 hr in Ar0. 2%SO2.

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