Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Cr, Mo and W on the Microstructure of Al Hot Dipped Carbon Steels

  • Trung, Trinh Van (School of Materials Science and Engineering, Hanoi University of Science and Technology) ;
  • Kim, Min Jung (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Park, Soon Yong (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Yadav, Poonam (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Abro, Muhammad Ali (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • Received : 2014.02.14
  • Accepted : 2014.02.24
  • Published : 2014.02.28
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Abstract

A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminized by hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formed on the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe, whereas the alloy layer consisted of Al-Fe intermetallics such as $Al_5Fe_2$ and AlFe. Cr, Mo, and W in T22 and T23 steels reduced the thickness of the topcoat and the alloy layer, and flattened the reaction front of the aluminized layer, when compared to the low carbon steel.

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