Home / Standards / GB/T 4949-2026 GB/T 4949-2026 Upcoming Chemical analysis methods for sacrificial anode of Al-Zn-In system alloy 铝-锌-铟系合金牺牲阳极化学分析方法 Standard Type GBT ICS 77.120.10 CCS H 12 Status 即将实施 Issue Date 2026-01-28 Implementation 2026-08-01 Responsible Dept 国家标准委 Drafting Unit N/A