Microstructure and Corrosion Behaviour of Ni/Al-Al2O3 Gradient Ceramic Coatings on Q235 Steel


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Ni/Al-Al2O3 gradient ceramic coating was prepared on Q235 steel by plasma spraying. Microstructure and corrosion behavior in boiling 5%HCl solution of the samples sprayed with this coating were investigated. The results showed that thickness of Al2O3 ceramic coating was increased greatly and almost no connected pores formed in the gradient coating due to the existent of Ni/Al-Al2O3 transition interlayer coatings. The corrosion resistance of Q235 steel with Ni/Al-Al2O3 gradient composite ceramic coating in boiling 5%HCl solution was greatly improved.



Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong




M. H. Fang et al., "Microstructure and Corrosion Behaviour of Ni/Al-Al2O3 Gradient Ceramic Coatings on Q235 Steel", Key Engineering Materials, Vols. 336-338, pp. 2647-2648, 2007

Online since:

April 2007




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[2] 5 0 T im e , d a y N i/A l-A l2O 3 Fig. 2 SEM photographs of the interlayer of Ni/Al-Al2O3 gradient ceramic coating (a) Al2O3 dispersed in Ni/Al, (b) Ni/Al dispersed in Al2O3 Fig. 3 The relationship of mass loss curve of samples with Ni/Al-Al2O3 gradient ceramic coating in boiling 5%HCl solution versus corrosion time.

DOI: https://doi.org/10.1016/s0257-8972(03)00245-7