Quality control
Anodes must be made of the correct alloys if they are to provide the right output voltage, avoid forming an impervious crust and be free of wasteful self destruction. Never buy anodes that might contain melted scrap. A Quality anode will have chemical analysis of each melt made and recorded. . . . ISO 9001or 9002 applies.
Additional information . . . Zincsmart Home
Three different materials are used.
. . . Zinc anodes are made to MIL-A-18001K
(Output 780 Ampere hours per Kg.)
Cadmium . . . . 0.025% - 0.07% (no cadmium alloys are being investigated)
Copper . . . . . . .0.005% Max.
Iron . . . . . . . . . 0.005% Max.
Lead . . . . . . . . .0.006% Max.
Aluminium . . . . 0.1% - 0.5%
Zinc . . . . . . Remainder (special high grade 99.995%)
. . Aluminium anodes are to MIL A 24779(SH) or similar specification
(Output 2760 to 2000 Ampere hours per Kg.)
Copper . . . . . . 0.004% Max.
Iron . . . . . . . . . 0.09% Max.
Indium . . . . . . 0.014% - 0.02%
Mercury . . . . . 0.001% Max.
Silicon . . . . . . 0.08% - 0.20%
Zinc . . . . . . . . . 4.0% - 6.5%
Aluminium . . . Remainder (high grade)
. . Magnesium anodes for fresh water are usually AZ63
(1230 Ampere hours per Kg.)
Aluminium . . . . .5.3% - 6.7%
Zinc . . . . . . . . . 2.5% - 3.5%
Copper . . . . . . . 0.08% Max.
Silicon . . . . . . . . 0.3% Max.
Manganese . . . . 0.25% Min.
Iron . . . . . . . . . 0.005% Max.
Lead . . . . . . . . . 0.03% Max.
Nickel . . . . . . . 0.003% Max.
Magnesium . . . . Remainder