Galvanic Electrodeposition of Thick Tungsten Coatings on CuCrZr Alloy

摘要

The tungsten coatings were prepared on CuCrZr alloy substrate by galvanostatic electrolysis in Na2WO4-WO3 molten salt with duration from 1.5 to 30 h. The effects of electrodeposition duration on the morphology and microstructure of the coatings were investigated in this paper. Pure and compact tungsten coatings were successfully obtained with columnar structure. The results demonstrated that with the duration increasing, the grain size and thickness of tungsten coatings increased while the (200) favored orientation dot not changed. However, the surface of tungsten coatings became no uniform and the current efficiency was decreased. The Vickers micro-hardness and oxygen content of tungsten coatings were decreased with the duration increasing.