Preparation and evaluation of HA–PP coating on AZ31B magnesium alloy for implant applications

To make Mg alloy implants have better corrosion resistance and reduced degradation rate in the human body, hydroxyapatite (HA), polypropylene (PP), and HA+PP coatings were added to the surface of AZ31B through dip coating. Coated samples were tested for weight differences, corrosion rate, surface ro...

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Bibliographic Details
Published inSurface engineering Vol. 40; no. 3; pp. 266 - 275
Main Authors Singh, Arvind Kumar, Mahto, Vinod Kumar, Malik, Anup
Format Journal Article
LanguageEnglish
Published London, England SAGE Publications 01.03.2024
Subjects
polypropylene coating
magnesium alloys
dip coating
corrosion resistance
hydroxyapatite coating
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ISSN0267-0844
1743-2944
DOI10.1177/02670844241235763

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Summary:To make Mg alloy implants have better corrosion resistance and reduced degradation rate in the human body, hydroxyapatite (HA), polypropylene (PP), and HA+PP coatings were added to the surface of AZ31B through dip coating. Coated samples were tested for weight differences, corrosion rate, surface roughness, and microscopic view. Scanning electron microscopy and energy dispersive spectroscopy analysis confirm coating on the substrate surfaces. The potentiodynamic polarisation test result shows that the corrosion rate in the uncoated substrate (10.138 mm/y) was higher compared to HA-coated = 0.5084 mm/y, PP-coated = 0.442 mm/y, and HA/PP-coated = 0.3275 mm/y. After 14 days, weight loss (5.5%) was highest in the uncoated and lowest in the HA-PP-coated (0.9%). Deposition of the bone mineral was higher on the HA-coated sample, showing superior bone integration properties. Hybrid coating improved electrochemical properties compared to HA coating on Mg alloy.
ISSN:0267-0844
1743-2944
DOI:10.1177/02670844241235763