الفهرس 
CHAPTER IOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
Our study was concerned with the electroless nickel bath containing sodium hypophosphite as reducing agent and citric acid as complexing agent, it can be possible to deposit Ni-P, Ni-W-P, Ni-Sn-P, Ni-W-Sn-P coatings at bath temperature (90°C) and pH = 8.5. We study the effect of blackening of Ni-P, Ni-W-P, Ni-Sn-P and Ni-W-Sn-P on mechanical and electrochemical properties of the surface and solar properties of the blackening surface.
In the first part, electroless Ni-P and Ni-W-P coatings were prepared using alkaline bath and concentrations of sodium tungstate is 2g/l . The plating temperature (90̊C) is carried out for 60 minutes. Also we study the effect of blackening process of Ni-P, Ni-W-P.