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Investigate the Metallurgical, Degradation Behavior, and Mechanical Characteristics of a Novel Magnesium Alloy

Al Khaqani Baraa H., Dawood Nawal Mohammed

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 5

302--312

Today, the use of magnesium alloys in medical applications as a decomposing material is extensive, so a new magnesium alloy Mg-2Al-1Nd was prepared by an investment-casting method in a medium protected from atmospheric oxygen. One of the rare elements, Nd, was added to improve the microstructural and mechanical properties and corrosion resistance in simulated blood plasma media. The XRF test determined the chemical characterization elements, the SEM test was used to identify the distribution of phases and their shape inside the base before and after heat treatment, and the XRD test was conducted to determine the type of phases that formed and the effect of these phases on other properties was studied. Also, hardness was measured using Vickers microhardness, in which the improvement rate was 75%, and a compression test to determine the mechanical properties of the prepared alloy found that the modulus of elasticity was 42GPa.To study its corrosive behavior inside the human body, a test was conducted on corrosion by the Tafel method to measure corrosion resistance in simulated blood plasma solution, Where the value of the corrosion rate of the alloy after the heat treatment became 0.089mm/y and Rp equal 4.13KΩ/cm2, These results made the new magnesium alloy a good candidate for use in temporary medical applications.

Corrosion protection of 316L stainless steel by (PVDF/HA) composite coating using a spinning coating technique

Hussein Asra Ali, Dawood Nawal Mohammed, Al-Kawaz Ammar Emad

Bulletin of the Polish Academy of Sciences. Technical Sciences

2021

Vol. 69, nr 2

art. no. e136810

Polymer coatings are increasingly used in varied fields and applications from simple coatings of barrier to intricated nanotechnology based composite. In the present study, polyvinylidene fluoride(PVDF)/Hydroxyapatite (HA )coatings were produced by spin coating technique over 316L SS. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) were used to observe the coated 316L SS substrates surface morphology. The corrosion protection efficiency of pure polyvinylidene fluoride and polyvinylidene fluoride/HA nanocomposite coatings on 316L SS was inspected using potentiodynamic polarization along with the ions release techniques in Hank’s solution. A superior biocompatibility and an improved protection performance against corrosion were obtained for the 316L SS samples with nanocomposite coatings compared with the pure polyvinylidene fluoride coatings and pristine 316L SS counterparts. The 316L SS samples coated by PVDF/HA nanocomposite showed enhanced corrosion protection within Hank’s solution. The corrosion of 316L SS samples within Hank’s solution increased from 92.99% to 99.99% when using 3wt% HA due to increasing the PVDF inhibition efficiency. Good agreements in the electrochemical corrosion parameters were obtained from using ions release and potentiodynamic polarization tests.