2004HB/Z 5218.18-2004 Methods for chemical analysis of aluminium alloys-Part 18:Determination of chromium content by ammonium ferrous sulfate volumetric method
1970HB 5218.18-1995 Aluminum Alloy Chemical Analysis Method Ferrous Ammonium Sulfate Titration Method for Determination of Chromium Content
1982HB 5218.18-1982 Determination of vanadium content in aluminum alloy