Page 79 - Book of Abstracts

th
8 Biannual Conference on Chemistry - CHEM 08

Preparation, characterization and electrochemical study of

Co-W alloy coatings of high hardness
N. F. El Boraei and M. A. M. Ibrahim
Department of Chemistry, Faculty of Education, Ain Shams University,

Roxy, 11711, Cairo, Egypt Department of Chemistry, Faculty of Science,
Ain Shams University, Abbassia, Cairo 11566, Egypt
Email: nobl_foad@edu.asu.edu.eg

ABSTRACT
In this work, It was found that the W content was in the range of 7.7–
13.3 wt.% relying on the operating conditions. The cathodic current
efficiency (CCE%) of the deposited alloy from this bath was characterized
by relatively high values (75.7 - 97.0%) in comparison with citrate baths.
The XRD analysis indicates that the Co-W alloy is crystalline in nature.
The microhardness of Co-W alloy coatings is comparable or even higher
than that of hard chromium coatings (∼ 963-1119 kg mm ). Moreover, the
-2
Co-W alloy coatings are crack-free as shown from SEM investigations.

BOOK OF ABSTRACTS CHEM 08 (2020) Page 78