Low Driving Voltage Aluminum Alloy Anode for Cathodic Protection of High Strength Steel
The present work was focus on developing low driving voltage sacrificial anode for high strength steels. Taking the zinc and bismuth as main active elements, we designed and prepared several aluminum alloy anodes and investigated their electrochemical performance by galvanic test in natural seawater. The results showed that the anode exhibits high performance with 0.55wt.% Zn and 0.5wt.% Bi as the alloying elements. Its potential is varied from -800mV to -820mV, the current capacity is 2565 Ahr/kg, and the dissolution is homogeneous. We concluded that Al-0.55%Zn-0.5%Bi alloy anode can be used to high strength steel for corrosion protection. The microstructures of the anodes were observed by optical microscope, the result proposed that the uniform dissolution morphology of Al-0.55%Zn-0.5%Bi anode is due to its fine grain size.
Yansheng Yin and Xin Wang
L. Ma et al., "Low Driving Voltage Aluminum Alloy Anode for Cathodic Protection of High Strength Steel", Advanced Materials Research, Vols. 79-82, pp. 1047-1050, 2009