针对国标铝阳极在滩海陆岸环境中不能满足阴极保护要求的问题,建立了用于模拟滩海陆岸环境的试验装置,研究了3种新型铝阳极在滩海陆岸环境中的工作特性和活化机理。结果表明:Al-1阳极和Al-3阳极的实际电容量均大于1 500 A ·h ·kg^-1,电流效率均大于50%,这优于国标铝阳极性能;在-1.10 V极化电位下,3种新型阳极的稳定阳极电流密度分别为128 μA ·cm^-2(Al-1阳极)和70 μA ·cm^-2(Al-2阳极和Al-3阳极)。Al-1阳极更适合滩海陆岸环境,原因是Al-1阳极中Sn-In固溶体和GaO^3-₃的还原过程促进了铝阳极表面腐蚀产物层在滩海陆岸环境中的持续溶解。

Aiming at the problem that the national standard aluminum anode cannot meet the requirements of cathodic protection in the tidal and coastal environment, a test device for simulating tidal and coastal soil environment was established, and the working characteristics and activation mechanism of three new Al anodes in tidal and coastal environment were studied. The results showed that the actual capacitance of Al-1 anode and Al-3 anode was greater than 1 500 A ·h ·kg^-1, and the current efficiency was greater than 50 %, which was better than the national standard aluminum anode performance. At -1.10 V polarization potential, the stable anode current densities of the three new anodes were 128 μA ·cm^-2 ( Al-1 anode ) and 70 μA ·cm^-2 ( Al-2 anode and Al-3 anode ), respectively. The Al-1 anode was more suitable for the beach and coastal environment, because the reduction process of Sn-In solid solution and GaO^3-₃ in the Al-1 anode promoted the continuous dissolution of corrosion product layer on the surface of aluminum anode in tidal and coastal environment.