Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2-0.1% H2S GasReportar como inadecuado




Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2-0.1% H2S Gas - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea





*

Author to whom correspondence should be addressed.



Academic Editors: Vineet V. Joshi and Alan Meier

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





Autor: Muhammad Ali Abro and Dong Bok Lee *

Fuente: http://mdpi.com/



DESCARGAR PDF




Documentos relacionados