Texture Analysis and Corrosion Testing of Aluminized Carbon Steel C45

Muhammed, Hawkar J. and Benke, Márton and Koncz-Horváth, Dániel and Sályi, Zsolt and Török, Tamás I. (2020) Texture Analysis and Corrosion Testing of Aluminized Carbon Steel C45. Materials Science and Engineering, 45 (1). pp. 136-142. ISSN 2063-6792

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Abstract

The texture of hot-dip aluminized carbon steel C45 has been studied. Hot-dip alu-minized (HDA) samples were prepared by laboratory experiments. The structure and crystal orientation of the topcoat layer of an aluminized specimen was analyzed through X-ray dif-fraction. The outcome of XRD reveals that the phase formed after removing the excess alu-minum from the top surface (ripples) of the coated sample was FeAl, a non-stochiometric intermetallic with a Fe/Al atomic ratio of 1/1, but it also contains some impurity atoms, which cannot be identified with XRD. These impurity atoms modify the lattice plane distance d values of the FeAl phase, and as a result, the reflections shift. Lattice orientation of such a phase was found to be (110). Corrosion testing of the hot air-exposed (at 700 °C and for several hours) aluminized specimens were also performed, which revealed the still quite high wet corrosion (that is the salt water exposure at ambient air) resistance of the so modified outermost surface zone consisting of iron aluminides formed during the prior high-tempera-ture exposure.

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