期刊
METALS
卷 2, 期 3, 页码 353-376出版社
MDPI
DOI: 10.3390/met2030353
关键词
magnesium; sacrificial anode; cathodic protection; Mg-rich primers; anticorrosive coatings; aluminum alloys; corrosion protection
资金
- Mandaree Enterprise Corporation [FA8501-06-D-0001]
- Engineer Research and Development Center [ERDC W9132T-09-2-0019]
- United States Air Force [FA7000-10-2-0014]
- Department of Defense and collaborative efforts for Corrosion Prevention and Understanding via the Technical Corrosion Collaboration working group comprising The University of Virginia
- University of Hawaii
- Ohio State University
- Air Force Academy
- University of Akron
- University of Southern Mississippi
- Air Force Institute of Technology
- Naval Postgraduate School
- US Naval Academy
- Nippon Paper Chemicals Co., Ltd.
Magnesium is electrochemically the most active metal employed in common structural alloys of iron and aluminum. Mg is widely used as a sacrificial anode to provide cathodic protection of underground and undersea metallic structures, ships, submarines, bridges, decks, aircraft and ground transportation systems. Following the same principle of utilizing Mg characteristics in engineering advantages in a decade-long successful R&D effort, Mg powder is now employed in organic coatings (termed as Mg-rich primers) as a sacrificial anode pigment to protect aerospace grade aluminum alloys against corrosion. Mg-rich primers have performed very well on aluminum alloys when compared against the current chromate standard, but the carcinogenic chromate-based coatings/pretreatments are being widely used by the Department of Defense (DoD) to protect its infrastructure and fleets against corrosion damage. Factors such as reactivity of Mg particles in the coating matrix during exposure to aggressive corrosion environments, interaction of atmospheric gases with Mg particles and the impact of Mg dissolution, increases in pH and hydrogen gas liberation at coating-metal interface, and primer adhesion need to be considered for further development of Mg-rich primer technology.
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