There are many methods to improve the surface of aluminum or aluminum alloys according to the applications, including electroplating techniques. In this study, Composite of hard chromium-Nanoceramic Co-deposit was achieved. Nanozirconia (Nano-ZrO2), Nanotitanium oxide (Nano-TiO2), and Nano-aluminum oxide (?-Nano-Al2O3) were used in the bath of hard chromium electroplating on 1050 Al-alloy. Light optical microscope with digital camera (LOM) was used for microstructure examination. Scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS or EDX) were employed for co-deposit analyses and thickness characterization. Micro hardness tester for hardness was evaluated. The hardness increased with increasing the content of Nanoceramic particles in the electroplating path, ZrO2, ?-Al2O3 and TiO2 respectively. Moreover, the thickness was increased with increasing ZrO2, ?-Al2O3 and TiO2 content. The results showed that, the maximum hardness and maximum thickness at the samples with Nanotitanium particles were 1227MPa, 17.2?m respectively.

CONCLUSION
The results obtained from this study can lead to the following conclusions;
• The surface of Al-alloy can be improved by hard chromium-nanoceramic composite electroplating.
• The thickness of co-deposit depends on true density of Nano-ceramic particles, in other word, high true
density lead to low deposit thickness.
• The increasing deposit thickness of nanoceramic composite electroplating lead to increase the hardness.
• The highest thickness was in sample electroplated by co-deposit of Cr-TiO2
• The layers of coating were compact and uniform, as this was evident in all the previous figures.