Size effect of microhardness of nanocrystalline Co-W coatings produced from citrate and gluconate solutions
Tóm tắt
The influence of various electrodeposition conditions (current density, including volume current density, and hydrodynamic conditions in different electrode systems such as the Hull cell with a rotating cylinder electrode and a cell without stirring, including a soluble anode (W) and an insoluble anode (graphite)) on the microhardness of nanocrystalline Co-W coatings, obtained from citrate and gluconate electrolytes, is investigated. It has been shown that the volume deposition current density is a governing factor which influences the measured microhardness values due to the microhardness size effect, that is, the dependences of microhardness on electrodeposition surface area for a fixed current density and electrolyte volume. The conditions, e.g., volume current densities, for maximum microhardness are determined.
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