Abstract
The sacrifice of the anode is the cathodic protection used to prevent corrosion. Al-Zn-In alloys are often used it causes excessive protection that can increase the possibility of hydrogen embrittlement in high-strength steel. Therefore, the solution is to use aluminum alloys with low voltage current. The purpose of this research is to know the efficiency of aluminum sacrificial anode with alloy elements Zn, Si and Cu as low voltage current. As well as studying the potential of Al alloys with elements Zn, Cu and Si can be used as sacrificial anodes at sea water conditions. Testing methods performed are Optical Emission Spectroscopy testing, weight loss testing, efficiency testing, Electrochemical Impedance Spectroscopy testing, and metallographic testing. From this research, we found the result of Al-Zn-Cu alloy which has electrochemical capacity and best efficiency is Al-5Zn-0,1Cu Alloy for 2795 Ah / kg with 98% efficiency and Al-Zn-Si alloy with capacity value electrochemistry and the best efficiency is Al-5Zn-0.1Si alloy for 2808 Ah / kg with 98% efficiency. The lowest value of transfer resistance is found in Al-5Zn-0.1Cu alloy and Al-5Zn-0.1Si alloy with the value of 1012.7 Ω and 1092.9 Ω and the double capacitance value in the smallest Al-Zn-Cu alloy is alloy Al-5Zn-0.5Cu with the value of 13.2 μMho while in Al-Zn-Si alloys are present in Al-5Zn-0.5Si with the value of 19 μMho. With the structure obtained is the greater the addition of Cu and Si, the more rough and corroded surface sacrificial anodes.
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