Abstract
Compact and smooth tungsten coatings on low activation steel substrates were successfully prepared by electrodeposition from Na2WO4–WO3 molten salt at 1173 K in the air. The effects of plating time on the performance of tungsten coating were investigated. The surface morphology showed that tungsten grains changed from the amorphous into regular hexagonal over time. The prepared tungsten coatings were highly (2 1 1)-orientated and exhibited body centered cubic structure via XRD characterization. The thickest tungsten coating (387 ± 15.72 μm) was achieved with the plating time of 40 h. Besides, the tungsten coating displayed acceptable hardness of 389.3 ± 16.8 HV and high adhesive strength to the substrate of 43.39 MPa. Furthermore, the tungsten coatings can stand more than 150 times thermal circles under 773 K, and 20 times under 1023 and 1173 K.
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