Loading...
Electroplating of iron on AZ31 magnesium alloy for coronary stent applications
Senthil Kumar, Siddarth
Senthil Kumar, Siddarth
Citations
Altmetric:
Files
Loading...
thesis
Adobe PDF, 2.61 MB
Authors
Other Names
Location
Time Period
Advisors
Original Date
Digitization Date
Issue Date
2014-05
Type
Thesis
Genre
Keywords
Subjects (LCSH)
Electronic dissertations
Electronic dissertations
Electronic dissertations
Citation
Abstract
Drawbacks with permanent metal stents led to the investigation of alternative biodegradable stent
materials. Potential biodegradable polymers for stents lack the mechanical strength as compared
to metals used for stents. Magnesium (Mg) based materials are being investigated as a potential
biodegradable metallic stent materials because of its biocompatibility and high strength to weight
ratio. Magnesium possesses poor corrosion resistance in physiological environments, thus
surface modification strategies on magnesium are needed. Challenges with surface coating on
magnesium exist due to the high reactivity of magnesium. The objective of this thesis was to
electroplate iron on AZ31 magnesium alloy. Iron being a part of human body and a major
component of 316 L stainless steel, which is considered to be the gold standard of arterial stent
was electroplated onto the surface of the AZ31 magnesium alloy. Iron was electroplated with an
intermediate copper layer to prevent its interaction with the electrolyte and compared with the
iron coating without an intermediate copper layer. The electroplated sample was characterized
using SEM-EDX, XRD, XPS and roughness measurements. EDX analysis proved the presence
of 40% iron by atomic weight. XRD analysis proved the presence of iron in magnetite form and
XPS confirmed the presence of iron. The thickness of the sample was measured by SEM which
was found to be 30.8µm. Roughness of the sample was measured using a digital microscope with
surface analyzer using which the roughness was found to be 10.4776µm. Accelerated corrosion
tests conducted in PBS proved that iron coated magnesium samples had better corrosion
resistance than bare Mg. The corrosion rate of coated Mg was 1.373632mm/yr and the corrosion
rate of bare Mg was 40.4114 mm/yr. This proves that iron coated Mg can be expected to stay
longer in the body compared to the uncoated ones.
Table of Contents
Description
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Industrial and Manufacturing Engineering
Publisher
Wichita State University
Journal
Book Title
Series
Digital Collection
Finding Aid URL
Use and Reproduction
Copyright 2014 Siddarth Senthil Kumar