Standard :GB 4948 used for Hull, Ballast tanks, offshore engineering, Harbor Structures, Sea water cooling system,etc Aluminum anodes. Which can be used for Hull, Ballast tanks, offshore engineering, Harbor Structures, Sea water cooling system, and submerged pipelines. Standard :GB 4948Chemical Composition Analysis (%) TypeZnInCdSnMgSiTiImpurity ,less thanAlSiFeCuAl-Zn-In-CdA112.5-4.50.018-0.0500 ...