热喷涂复合牺牲阳极在混凝土中的电化学性能

摘要

The performance of sacrificial anodes of casting alloy and thermal-sprayed alloy were measured in the concretes with different mix proportions and different covering layer thicknesses by electrochemical method. The results showed that the rebars were protected well by all above mentioned alloy anodes in the laboratory conditions. The concrete mix proportion and the covering layer thickness had an impact on the performance of the sacrificial anodes. The anode of thermal-sprayed Zn alloy provided more galvanic current than the casting alloy. The anode of thermal-sprayed Al alloy offered more protection current than that of thermal-sprayed Zn alloy. The anodes of thermal-sprayed alloy showed more exchange current density and more negative corrosion potential than those of casting alloy in concrete.%采用电化学方法比较了熔铸合金和热喷涂合金阳极在不同配合比和不同保护层厚度混凝土中的牺牲阳极性能.结果表明,考察的几类合金对钢筋都有很好的保护作用；混凝土的配合比和钢筋保护层厚度对牺牲阳极的性能有影响；热喷涂锌合金比熔铸锌合金有更大的输出电流；热喷涂铝合金比热喷涂锌合金有较大的输出电流；在混凝土中热喷涂合金阳极比熔铸阳极有更负的自然腐蚀电位和更大的交换电流密度.