Resumo

QUINTERO, LUZ S.; LAVERDE, DIONISIO  e  ESCALANTE, HUMBERTO. IMPROVING CORROSION RESISTANCE OF A T91 STEEL BY ALUMINIZING. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.165, pp.138-149. ISSN 0012-7353.

T91 ferritic steel has been widely used in traditional power generation plants, boilers and nuclear power plants. However, its oxidation resistance is significantly reduced at temperatures above 600ºC. This research focused on the application of pack cementation technique to aluminize a T91 steel and optimum conditions were identified to diffuse a coating with uniform thickness (300 microns) and free of porosities. The oxide layer grown after oxidation at 800ºC in air was evaluated. Characterization of the coating and the oxide layer (Al₂O₃) was carried out by using SEM, EDX and mapping. The results show a good oxidation resistance of the aluminized T91 steel, owing to the growth of a continuous thin layer of alumina with an average thickness of 6 microns after 7 days oxidation.

Palavras-chave : Aluminizing; coating; alumina; ferritic steel; pack cementation; high temperature oxidation.

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