目前,国内外尚未研制出性能优良的低驱动电位牺牲阳极材料.为此,炼制了3种Al-Zn-Ga-Si牺牲阳极材料,采用恒电流方法评价了其电化学性能,采用SEM观察了阳极材料的微观溶解形貌,金相显微镜观察阳极的金相组织.结果表明:Al-0.3%Zn-0.1%Ga-0.9%Si阳极的综合电化学性能较好,工作电位为-780～-820mV,电流效率83%,溶解较均匀;随着合金元素Si含量增多,铝合金的晶粒变小,偏析相数量增加.
Three kinds of Al-Zn-Ga-Si sacrificial anodes with different compositions were designed and prepared for developing low voltage sacrificial anodes used for cathodic protection of high strength steels in ocean environment. The electrochemical performance of the three sacrificial anodes was evaluated by using galvanostatic method. Their micro-morphologies upon dissolution were observed by using a scanning electron microscope. Moreover , their metallographic structures were observed by using a met-allographic microscope. Results show that the Al - alloy anode containing 0.3%Zn, 0. 1 %Ga and 0.9%Si has good comprehensive electrochemical performance, which had an operating potential of-820 ~-780 mV, current efficiency of 83% and goodmorphology after dissolution. Moreover, the grain size of the aluminum alloy decreased with increasing content of alloying element Si, and the amount of segregation phases increased therewith.
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