高效铝合金牺牲阳极的研究

在铝中添加合金元素Zn,Mg,In,Ga,Ca,利用正交设计方法,研制出一种高效的铝合金牺牲阳极,它在海水中的电流效率达95.6％,电位为-1.09V(SCE)。并研究了合金元素In,Ga,Ca对铝合金电化学性能的影响及阳极活化机理。

STUDY ON HIGH EFFICIENCY ALUMINIUM ALLOY SACRIFICIAL ANODS

One type of aluminium alloy sacrificial anode with high current efficiency of 95.6% and potential of -1.09V (SCE) in seawater was developed by alloying aluminium with zinc, magnesium, indium, gallium and calcium. The compositions were arranged by orthogonal design.The result of electron miscoprobe and X-ray analysis indicated that gallium distributed homogeneously, but indium and calcium precipitated out as secondary phase.The effects of In, Ga and Ca on the electrochemical properties of aluminium alloys were studied. The experimential results of introducing cations into 3% NaC1 solution showed that the activation of aluminium anode were mainly due to redeposit of In3+ or G3+ ions on the anode surface.The effects of alloying elements on the negative difference effect of anode were studied with the method of hydrogen collection. The decrease in negative difference effect was caused by the alloying elements in solid solution or in secondary phase.