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Halide Activators Suitable for Low Temperature Pack Aluminisation of Electroplated Nickel on Creep Resistant Ferritic Steels

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Abstract:

This study aims to identify suitable activators for pack aluminising electroplated Ni in order to provide processing flexibility for forming Ni-aluminide/Ni hybrid coatings on creep resistant ferritic steels at temperatures below 700 °C. Experiments are made using NH4Cl, AlCl3 (anhydrous), NaCl and NH4F activated packs prepared from Al and Al2O3 powders. Both NH4Cl and AlCl3 (anhydrous) are found to be suitable activators. NaCl may be used as an activator if the amount of Al added is sufficiently high. But, the fluoride salts cannot be used as activators in the low temperature range concerned here due to their strong tendency to deposit AlF3.

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Periodical:

Advanced Materials Research (Volume 852)

Pages:

228-232

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.852.228

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Online since:

January 2014

Authors:

J. Wang, K. Li, C.Y. Zhu, Zhi Dong Xiang

Keywords:

Ferritic Steels, Nickel Aluminide Coating, Nickel Electroplating, Pack Aluminisation

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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