摘要
对热喷涂复合牺牲阳极在混凝土中的性能进行了测试,研究发现在实验所考察的条件下所研究的热喷涂复合牺牲阳极体系对钢筋都有很好的保护作用,并且喷镁合金复合阳极的极化值最大,喷铝合金复合阳极次之,喷锌合金复合阳极极化值最小。热喷涂锌合金比同牌号的熔铸锌合金有更大的输出电流,在混凝土中热喷涂复合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。金相结构分析发现喷涂锌合金阳极是一种多孔的疏松结构,它的晶粒细小,晶界多,晶界间存在孔隙,这种结构使得热喷涂阳极具有更好的牺牲阳极电化学性能。
The performance of thermal-sprayed composite sacrificial anodes was measured in the concrete. It was found that the rebars were protected well by all the thermal-sprayed composite sacrificial anodes in the laboratory conditions. The polarization of the Magnesium alloy composite sacrificial anode was the biggest, the Aluminum alloy's polarization was bigger than Zinc alloy's one and the Zinc alloy's polarization was the smallest. The anode of thermal-sprayed Zn alloy provided more galvanic current than the casting alloy in the same brands. The anodes of thermal-sprayed alloy showed more exchange current density and more negative corrosion potential than casting ones in concrete. It was showed that the structure of thermal-sprayed zinc alloy anodes was a loose porous by metallographic structure analysis. It was fine grain size, more grain boundaries. A lot of porosity existed between the grain boundaries. These particular structures made the thermal-sprayed anode have the better of electro-chemical properties.
出处
《热喷涂技术》
2010年第4期9-13,共5页
Thermal Spray Technology