A variety of approaches enable deposition of metallic coatings containing rare earth (RE) elements for corrosion protection. Al-TM-RE amorphous and amorphous nanocrystalline alloys are one type of multifunctional material for protection of Al alloys. Ce and Al-Ce coatings have also been deposited. Results for high density, low porosity multifunctional Al-Co-Ce metallic coatings applied to an AA-2024-T351 substrate using a pulsed thermal spray (PTS) are discussed in detail. Three proposed modes of corrosion protection are provided by the coating (i.e. a localized corrosion barrier, a sacrificial anode to supply cathodic protection of any exposed AA 2024-T351, and active inhibitor release) to protect AA 2024-T351. Chemical protection is afforded by either Ce(OH)2
2+ or Ce3+ release.
Discussion(0)
No comments yet. Be the first to comment.