High Temperature Corrosion of Al Hot-Dipped Low Carbon Steels in N2/H2S-Mixed Gases

Muhammad Ali Abro; Dong Bok Lee

doi:10.4028/www.scientific.net/DDF.369.59

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 369High Temperature Corrosion of Al Hot-Dipped Low...

High Temperature Corrosion of Al Hot-Dipped Low Carbon Steels in N₂/H₂S-Mixed Gases

Abstract:

A low carbon steel was hot-dip aluminized, and corroded in the N₂/0.4%H₂S-mixed gas at 650-850°C for 20-50 h in order to find the effect of aluminizing on the high-temperature corrosion of the low carbon steel in the H₂S environment. A thin Al topcoat and a thick Al-Fe alloy layer that consisted primarily of Al₅Fe₂and some FeAl and Al₃Fe formed on the surface after aluminizing. The corrosion rate increased with an increase in temperature. Hot-dip aluminizing increased the corrosion resistance of the carbon steel through forming a thin protective α-Al₂O₃ scale on the surface. The α-Al₂O₃ scale was susceptible to spallation. During corrosion, internal voids formed in the Al-Fe alloy layer, where the Al₅Fe₂, AlFe, and Al₃Fe compounds gradually transformed through interdiffusion.