The anodizing patent (ZL 2013 1 0498581.1) with “three‑protective” functions, invented by Sanrong Company, is a method that achieves the oxide film’s “three‑protective” capabilities through a functional stacking process.
The development of this coating has mitigated the three primary forms of corrosion damage experienced by aluminum alloys in marine environments—pitting corrosion under high-salinity fog, humid heat, and fungal exposure; galvanic corrosion; and stress‑corrosion cracking—thereby extending the service life of aluminum alloy products in marine settings by a factor of three or more.
This type of “three‑protective” anodized coating has been widely employed in aluminum alloy products—such as shipboard electronic equipment, radars, and naval‑mounted aluminum alloy weapon systems—that operate under marine climatic conditions.