Aluminizing Mechanism and Corrosion Resistance of Pipeline Steel X80 by Combined Pack Cementation Process under Low Temperature

Abstract:

In order to improve the corrosion resistance of pipeline steel X80 and maintain its good mechanical properties simultaneously, a low-temperature pack aluminizing process was carried out at 723 K on pipeline steel X80 after a surface mechanical attrition treatment (SMAT). The phase composition, microstructure and element distribution of the as-aluminized pipeline steel X80 were characterized by XRD, SEM and EDS, respectively.The results show that the as-received aluminide layer consists of Fe2Al5, which exhibits a good cohesion with SMATed pipeline steel X80 substrate with the thickness of around 90 μm. The element concentrations of Al and Fe atoms show a gradual change in the range of aluminide layer. After corrosion test processed in 3.5% NaCl solution, there is no obvious corrosion crack or uphills piled up by corrosion products on the surface of as-aluminized SMATed pipeline steel, which can conclude that pack aluminizing assisting by SMAT at low-temperature is an effective way for protecting pipeline steel X80 against corrosion.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 232-236
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.232
• Online since: February 2011
• Authors: Min Huang, Yu Wang, Xiang Hong Lv
• Keywords: Corrosion Resistance, Low-Temperature Pack Aluminizing, Pipeline Steel X80, Surface Mechanical Attrition Treatment (SMAT)

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