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Metals 2016, 6(2), 38; doi:10.3390/met6020038

Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2/0.1% H2S Gas

School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea
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Author to whom correspondence should be addressed.
Academic Editors: Vineet V. Joshi and Alan Meier
Received: 11 January 2016 / Revised: 3 February 2016 / Accepted: 5 February 2016 / Published: 17 February 2016
(This article belongs to the Special Issue Oxidation of Metals)
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Abstract

High-temperature corrosion of carbon steel in N2/0.1% H2S mixed gas at 600–800 °C for 50–100 h was studied after hot-dipping in the aluminum molten bath. Hot-dipping resulted in the formation of the Al topcoat and the Al-Fe alloy layer firmly adhered on the substrate. The Al-Fe alloy layer consisted primarily of a wide, tongue-like Al5Fe2 layer and narrow Al3Fe layer. When corroded at 800 °C for 100 h, the Al topcoat partially oxidized to the protective but non-adherent α-Al2O3 layer, and the interdiffusion converted the Al-Fe alloy layer to an (Al13Fe4, AlFe3)-mixed layer. The interdiffusion also lowered the microhardness of the hot-dipped steel. The α-Al2O3 layer formed on the hot-dipped steel protected the carbon steel against corrosion. Without the Al hot-dipping, the carbon steel failed by forming a thick, fragile, and non-protective FeS scale. View Full-Text
Keywords: H2S corrosion; hot-dip aluminizing; carbon steel; microhardness H2S corrosion; hot-dip aluminizing; carbon steel; microhardness
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Abro, M.A.; Lee, D.B. Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2/0.1% H2S Gas. Metals 2016, 6, 38.

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