Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : nickel


Preparation and Characterization of Biomedical Ni-Co-Al Shape Memory Alloys

Emad S. Al-Hassani; Sahib M. Al-Saffar; Zena Abdul Ameer

Engineering and Technology Journal, 2016, Volume 34, Issue 7, Pages 1457-1472

This research presents microstructural characterization of the CoNi Al shape memory alloy with focus on understanding the significant properties as well as the relation between the physical properties and microstructure of this alloy. Melting technique were used to prepare Co Al Ni shape memory alloys, where scanning electron microscope, light optical microscopy and x-ray diffraction investigations showed that structure of this alloy is polycrystalline double phase (β and γ) structure, and it found that the grain size and phase fraction of β phase was ranged from 9 to 16 μm and (50-80) % respectively. It was found that by increasing the heat treatment time the phase fraction of hard β phase increased and phase fraction of ductile γ phase decreased, and consequently the grain size and the hardness of β phase increased. Differential Scanning Calorimeter results showed that transformation temperature decreased by increasing Al/Co, that Co content affected on transformation temperature. Tafel Curves showed the corrosion behavior in simulation body fluid, where the corrosion rate was ranged from 0.13 to 0.47 mpy and increased with each of increasing the annealing time and Co content, and from cyclic curves, the pitting corrosion possibility is not observed due to the formation of a protective layerthat formed by Al element.According to these properties and behavior, it was found that this alloy could be a good choice to be used for biomedical applications, especially in surgical, catheter tools and medical instruments.

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.

Electrothermal Atomic Absorption Spectrophotometric Determination of Vanadium, Nickel And Lead In Hydrocarbon Polluted Soils

Bashar H. Qasim; Mais A. Mohammed; Mahmood M. Barbooti

Engineering and Technology Journal, 2010, Volume 28, Issue 1, Pages 17-28

The present work is a part of a project on the environmental site assessment of
a local petroleum refinery to evaluate the extent of pollution of the site with focus
on selected places of potential pollution. Soil samples were collected at various
depths from almost all locations including: production units, storage tanks, the
landfill lagoons at the outside boarder of the refinery and the residence location.
The analyses of vanadium, nickel and lead were carried out on extracts of the soil
samples made by five different dilute solutions of acetic acid, nitric acid, calcium
chloride, EDTA. The nature of the solvent is a determining factor in the efficiency
of transport of heavy metals from the soil into the solution. All of the
measurements were conducted by graphite furnace atomic absorption
spectrophotometry.
It was concluded that heavy metals are available even for the weakest extracting
solvent. This was an indication on the nature of the V, Ni and Pb, where they are
in inorganic forms due to the degradation by the microorganisms of the soil and
aided by dozens of raining seasons and severe hot summers of Iraq. However the
soil keeps some of the heavy metals in the original organo-metallic nature which
resulted in only partial extraction of these metals with the solutions employed.
Thus, the danger from these metals is limited due to their insolubility in water.
The range of vanadium detected in the various extracts is ; for nickel, the range
was and for lead the concentration range was . The V contents were in the range of
0.01 – 0.37 mg/Kg. The Ni content ranged between 0.06 and 4.5 mg/Kg. The
range of Pb contents obtained was in the range of 0.025 – 22.5 mg/Kg. The V and
Ni concentrations at the deep soil samples were less than that of the surface
samples in most locations. Meanwhile, the penetration of lead contamination
seems easier than V and Ni.

Effect of Temperature on The Solvent Extraction of Cobalt(II), Nickel(II), and Copper(II) Metal Ions by o-diphenylamino Benzoic Acid

Matheel D. Al-Sabti

Engineering and Technology Journal, 2008, Volume 26, Issue 5, Pages 496-500

The solvent extraction of cobalt, nickel, and copper ions by the ligand odiphenylamino
benzoic acid in chloroform at 273, 293, and 318 K has been
investigated. The values of pH1/2 and kex as well as the values for the thermodynamic
parameters ΔG, ΔH, and ΔS have been calculated.