Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Zinc

Corrosion Behavior of Anodized Pure Zinc in Sea Water

S. A. Ajeel; B. Ahmed

Engineering and Technology Journal, 2017, Volume 35, Issue 9, Pages 961-969

In the present work an electrochemical anodizations of pure Zn sheet result in the ZnO porous film structure in alkaline solution (15% ammonium florid) by using constant voltage technique at a range of (2-10) volt, for period time of 10 minutes at room temperature was studied .
Atomic force microscope (AFM) used to investigate the topography and roughness of anodic film formed on the surface, it was found that the roughness of the anodic film is mainly depended on the anodizing voltage and its increase from 0.2 (as polished) to (2.9) nm after anodizing. Coating thickness also increases with an increase in voltage from 0 to 285 μm after anodizing. The corrosion behaviors of anodized and non-anodized of zinc specimens in sea water are obtained. The corrosion current density and corrosion rate are decreased with an increase in supplying voltage which increases anodic film thickness.

Study the (Wear, Roughness, Micro hardness) of the Electroplated Layers on Low Carbon Steel Improved by Shoot Penning

Abd Al- khalaq Fawzy Hamood

Engineering and Technology Journal, 2012, Volume 30, Issue 16, Pages 2910-2922

In this study an electroplating method has been employed (with zinc, nickle).
Studying of mechanical, surface, metallurgical properties for each coated systems
and made a comparison among them and with shoot penned coated systems. Low
carbon steel alloy has been selected as a substrate. Studying of specified
properties including coating thickness and dry corrosion properties (oxidation at
high temperature) and comparison the results of each treatment with other
treatment results. Coated samples with nickel and zinc by electroplating methods
are used in order to compare among the resulting coating layer properties. Shoot
penning method also has been employed to the two coatings in order to determine
the compression residual stresses role in the variation of studied properties.
Results showed that nickel coating layer has higher oxidation resistance than zinc
coating layer at high temperature, but has lower roughness, micro hardness, wear
resistance and density. Microstructure inspection results showed ferrite- pearlite
phases in the treated samples for all coated systems, This ensures that this
treatment will not subject to any phases transformation, and formation of coating
layer with a different thickness as illustrated by micro structure images.