Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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High Temperature Corrosion of Cr(III) Coatings in N2/0.1%H2S Gas

  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Yuke, Shi (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • Received : 2019.03.26
  • Accepted : 2019.05.09
  • Published : 2019.06.30
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Abstract

Chromium was coated on a steel substrate by the Cr(III) electroplating method, and corroded at $500-900^{\circ}C$ for 5 h in $N_2/0.1%H_2S-mixed$ gas to study the high-temperature corrosion behavior of the Cr(III) coating in the highly corrosive $H_2S-environment$. 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 $Cr_2O_3$ layer, below which (S, O)-dissolved, thin, porous region developed. As corrosion progressed, a $Fe_2Cr_2O_4$ layer formed below the $Cr_2O_3$ layer. The coating displayed relatively good corrosion resistance due to formation of the $Cr_2O_3$ scale and progressive sealing of microcracks.

Keywords

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Fig. 1. Cr(III) coating. (a) SEM top view, (b) SEM cross-sectional image, (c) EDS spectra of spot 1, 2 and 3, (d) XRD pattern, (e) XPS spectra of Cr2P, C1S, and O1S.

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Fig. 2. Cr(III) coating after corrosion at 500℃ for 5 h in N2/0.1%H2S gas. (a) SEM top view, (b) SEM crosssectional image, (c) XRD pattern, (d) XPS spectra of Cr2P, C1S, O1S, Fe2P, N1S, and S2P.

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Fig. 3. Cr(III) coating after corrosion at 600℃ for 5 h in N2/0.1%H2S gas. (a) SEM top view, (b) SEM crosssectional image, (c) EDS line profiles along A-B shown in (b).

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Fig. 4. Cr(III) coating after corrosion at 700℃ for 5 h in N2/0.1%H2S gas. (a) SEM top view, (b) SEM crosssectional image, (c) XRD pattern.

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Fig. 5. Cr(III) coating after corrosion at 800℃ for 5 h in N2/0.1%H2S gas. (a) XRD pattern, (b) EPMA crosssectional image, (c) EPMA maps of (b).

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Fig. 6. Cr(III) coating after corrosion at 900℃ for 5 h in N2/0.1%H2S gas. (a) XRD pattern, (b) EPMA crosssectional image, (c) EPMA maps of (b).

Table 1. Bath composition and electrolysis conditions

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