High Temperature Corrosion of Cr(III) Coatings in N2/0.1%H2S Gas
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Chromium was coated on a steel substrate by the Cr(III) electroplating method, and corroded at 500-900 oC for 5 h in N2/0.1%H2S-mixed gas to study the high-temperature corrosion behavior of the Cr(III) coating in the highly corrosive H2S-environment. The coating consisted of (C, O)-supersaturated, nodular chromium grains with microcracks. Corrosion was dominated by oxidation owing to thermodynamic stability of oxides compared to sulfides and nitrides. Corrosion initially led to formation of the thin Cr2O3 layer, below which (S, O)-dissolved, thin, porous region developed. As corrosion progressed, a Fe2Cr2O4 layer formed below the Cr2O3 layer. The coating displayed relatively good corrosion resistance due to formation of the Cr2O3 scale and progressive sealing of microcracks.
Abstract
Chromium was coated on a steel substrate by the Cr(III) electroplating method, and corroded at 500-900 oC for 5 h in N2/0.1%H2S-mixed gas to study the high-temperature corrosion behavior of the Cr(III) coating in the highly corrosive H2S-environment. The coating consisted of (C, O)-supersaturated, nodular chromium grains with microcracks. Corrosion was dominated by oxidation owing to thermodynamic stability of oxides compared to sulfides and nitrides. Corrosion initially led to formation of the thin Cr2O3 layer, below which (S, O)-dissolved, thin, porous region developed. As corrosion progressed, a Fe2Cr2O4 layer formed below the Cr2O3 layer. The coating displayed relatively good corrosion resistance due to formation of the Cr2O3 scale and progressive sealing of microcracks.
참고문헌 (18)
- G. Hong, "Hard chromium plating from trivalent chromium solution", Plat. Surf. Finish, 88, pp.69~75 (2001)
- S. C. Kwon, "Characterization of intermediate Cr-C layer fabricated by electrodeposition in hexavalent and trivalent chromium baths", Surf. Coat. Technol, 183, pp.151~156 (2004)
- S. Hoshino, "The electrodeposition and properties of amorphous chromium films prepared from chromic acid solutions", J. Electrochem. Soc, 133, pp.681~685 (1986)
- A. Liang, "Preparation of crystalline chromium coating on Cu substrate directly by DC electrodepositing from wholly environmentally acceptable Cr(III)electrolyte", Mater. Lett, 119, pp.131~134 (2014)
- G. B. Hoflund, "A surface study of amorphous chromium films electrodeposited from chromic acid solutions", Part I, J. Vac. Sci. Technol., A, 4, pp.26~30 (1986)
- D. Kim, "Duplex coating for improvement of corrosion resistance in chromium deposit", Surf. Coat. Technol, 169-170, pp.650~654 (2003)
- K. S. Nam, "Improved wear and corrosion resistance of chromium(III) plating by oxynitrocarburising and steam oxidation", Mater. Lett, 58, pp.3540~3544 (2014)
- D.B. Lee, "Oxidation of Cr–C electroplating between 400 and 900℃ in air", Mater. Corros, 59, pp.598~601 (2008)
- R. John, "Sulfidation and mixed gas corrosion of alloys, in Shreir’s Corrosion Vol. 1", pp.240~271 (2010), Elsevier
- G.Y. Lai, "High-Temperature Corrosion and Materials Applications" (2007), ASM International
- M. Takaya, "Electrodeposition of Cr-SiC composite coatings and their wear characteristics", Plat. Surf. Finish, 38, pp.97~101 (1987)
- M. Andersson, "Deposition and characterization of magnetron sputtered amorphous Cr–C films", Vacuum, 86, pp.1408~1416 (2012)
- V. A. Safonov, "Application of valence-to-core X-ray emission spectroscopy for identification and estimation of amount of carbon covalently bonded to chromium in amorphous Cr-C coatings prepared by magnetron sputtering", Appl. Surf. Sci, 427, pp.566~572 (2018)
- L. Yate, "Ultra low nanowear in novel chromium", amorphous chromium carbide nanocomposite films, 2017, pp.420, 707~713
- A. A. Edigaryan, "Properties and preparation of amorphous chromium carbide electroplates", Electochem. Acta, 47, pp.2775~2786 (2002)
- R. E. Lobnig, "Mechanisms of simultaneous sulfidation and oxidation of Fe-Cr and Fe-Cr-Ni-alloys and of the failure of protective chromia scales", Corros. Sci, 30, pp.1045~1071 (1990)
- H.J. Grabke, "High Temperature Materials Corrosion in Coal Gasification Atmospheres", pp.59~82 (1984), Elsevier Applied Science Publishers
- G. Simkovich, "The change in growth mechanism of scales due to reactive elements", Oxid. Met, 44, pp.501~504 (1995)