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1.888.800.MESA
Saltwater is an extremely aggressive electrolyte for the submerged metal supports on offshore platforms. MESA offers a complete line of large cast aluminum anodes specifically designed for this application.
Aluminum is the anode of choice for saltwater environments. Engineered aluminum alloys offer relatively low consumption rates of 7 pounds per ampere-year. Aluminum anodes are available in both Mesalum I and Mesalum III alloys. Mesalum I produces an open circuit potential of -1.05 volts (with respect to a Ag/AgCl reference cell) and realizes a 95% current efficiency. Mesalum III generates a voltage potential of -1.15 volts and has a current efficiency of 85%.
MESA provides a complete line of anodes cast in a variety of weights and configurations to address numerous installation possibilities. Offshore anodes are cast with steel pipe cores, rods, or brackets for bolt or weld mounting. Custom anodes sizes and dimensions are available upon special request.
Composition
Hg
0.035-0.060% (Mesalum I)
Zn
0.35-0.60% (Mesalum I), 2.8-6.5% (Mesalum III)
Si
0.14-0.21% Max (Mesalum I), 0.08-0.21% Max (Mesalm III)
In
0.01-0.025% (Mesalum II)
Cu
0.004% Max (MesalumI), 0.006% Max (Mesalum II)
Fe
0.10% Max (Mesalum I), 0.12% Max (Mesalum II)
Other Each
0.02% Max (Mesalum I), 0.02% Max (Mesalum II)
Aluminum
Remainder (Mesalum I), Remainder (Mesalum II)
Electrochemical Properties
Electrode Potential (Cu/CuSO4) = 1.05 V (Mesalum I), -1.15 V (Mesalum II)
Nominal Ampere Hours/Pound = 1280 (Mesalum I), 1150 (Mesalum II)
Nominal Efficiency = 95% (Mesalum I), 85% (Mesalum II)
Typical Applications
Offshore anodes are primarily designed for weld attachment to steel risers or structural supports. Mesalum I is not recommended for areas where water flow is restricted. Mesalum III is recommended for any saltwater applications but especially in saline mud and lower chloride water environments.
