RPI Masters Project Preliminary Final Report Siobhan Fleming
7/25/12 Evaluation of Coating Methods for Corrosion Protection of
Magnesium Castings
Slide 2
Agenda Project Review Research Review Magnesium Magnesium
Alloys Magnesium Coatings Recommendations for alloys and
coatings
Slide 3
Project Review Extensive review of technical journals completed
Magnesium Alloys Coating for corrosion protection Review
highlighted new technology in coatings that may be very successful
in corrosion protection with more research. Good alloys for certain
application were identified throughout the document and segregated
in a final table.
Slide 4
Research Review Technical journals reviewed through electronic
village Offered excellent details for specific uses Provided
insight into new technologies Specific texts reviewed for
background on magnesium, magnesium alloys and coatings for
corrosion protection
Slide 5
Magnesium Lightest of light metal alloys Low Density Good Heat
Dissipation Good Damping Good Electro-magnetic shield Useful in
applications were weight is a critical design element Susceptible
to corrosion
Slide 6
Magnesium Alloys Alloys designed to improve corrosion
resistance Specific elements offer different benefits when combined
into alloy form Benefits are laid out in table format by element in
the paper Each alloy has its own benefits Selected alloys are
documented in paper for benefits
Slide 7
Magnesium Coatings Numerous different coatings provide coating
protection Example of coating protection for aerospace applications
is provided in paper Cold spray appears to be the future of
coatings More research is required on specific alloys in order to
eliminate the concern of galvanic corrosion.
Slide 8
Recommendations for Alloys and Coatings. AlloyApplicationNotes
AZ91 Cast Helicopter Transmission Housings Less costly, good
tensile strength, very susceptible to creep above 120C. Good
corrosion resistance. AM60/AM50/AM20 Automotive (wheels, seat
frames, steering wheels) Greater ductility and fracture toughness.
AS41 Automotive (crank case, transmission housing) Easier than AS21
to cast with better fluidity QE22Aerospace (landing wheels, gearbox
housings, helicopter rotor fittings) Superior tensile properties,
Expensive due to silver