Transcript Masters_Project_Preliminary_Final_Report.pptx

Evaluation of Coating Methods for Corrosion
Protection of Magnesium Castings
RPI Masters Project Preliminary Final Report
Siobhan Fleming
7/25/12
Agenda
 Project Review
 Research Review
 Magnesium
 Magnesium Alloys
 Magnesium Coatings
 Recommendations for alloys and coatings
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.
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
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
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
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.
Recommendations for Alloys and Coatings.
Alloy
Application
AZ91
Cast
Notes
Helicopter
Transmission Less costly, good tensile strength,
Housings
very susceptible to creep above
120ºC. Good corrosion resistance.
AM60/AM50/AM20
Automotive (wheels, seat frames, Greater
steering wheels)
AS41
Automotive
Aerospace
and
(crank
(landing
case, Easier than AS21 to cast with better
fluidity
wheels, Superior
tensile
gearbox housings, helicopter rotor Expensive due to silver
fittings)
fracture
toughness.
transmission housing)
QE22
ductility
properties,