TABLE XII 

 Sacrificial Anode Data 



Material 



Consumption Rate 

 Lb . per Amp-Year 



Cost per 

 Pound 



Cost per 

 Amp-Year 



Lead/Platinum 

 Minimiim 

 Maximum 



Graphite 

 (ir coke breeze) 

 Minimum 

 Maximum 



Lead/Silver 

 Minimum 

 Maximum 



High Silicon Cast Iron 

 Minimiom 

 Maximum 



Aliiminum 80^ Efficiency 



Zinc 90^ Efficiency 



Magnesiiim 50^ Efficiency 



O.OOU 

 0.013 



0.11 

 O.kk 



0.10 

 0.50 



0.1+2 

 2.U2 



8.1 



26.0 



17.5 



$2.32 



$0.0093 

 0.0301 



0.70 



0.077 

 0.308 



2.17 



0.217 

 1.09 



0.U7 



0.197 



l.lU 



0.50 



U.05 



0.20 



5.20 



0.50 



8.75 



Platinum: Unqualified inclusion of platinum in this table is not 

 realistic since the consumption rate is dependent upon the anode prepa- 

 ration technique. Thus^ bulk platinum has an extremely low consumption 

 ratey whereas platinum deposited onto an inert substrate such as titanium 

 or tantalum is consumed at a rate of about 6 mg/amp-year at high current 

 densities. Platinum is priced today at between $S.22 and $5.20 per gram. 



From Littauer (1966) 



A-16 



