传统的阴极保护技术只能应用在液体电解质环境中。为了对气相环境中的金属实施外加电流阴极保护,在金属表面上涂敷特地研制的以固体电解质Naβ″(B)-Al_2O_3为导电组分的涂层(代号CK),外面再涂敷电子导电的阳极涂层。构成阴极保护电流的固相通路。实验研究结果证实了这一新方案的可行性。
The application of conventional impressed current cathodic protection is restricted to metals which are exposed to aqueous environments. In order to protect cathodically metals against atmospheric corrosion, a special paint is formulated, which contains solid electrolyte sodium-β″(β)-alumina as electrolytically conducting component. The metal object to be protected is coated with the paint and sequentially covercd with auxiliary anode coating, which is an electronic conductor. The sandwich structure of the coating helps to carryout impressed current cathodic protection in atmospheric environments. The inner coating of high ionic conductivity serves as electrical path for protective current. A graphite reference electrode is installed to control the metal potential within a predetermined protective potential range. The additional advantage of the new arrangement is uniform potential distribution due to close proximity of cathodically protected surface to anode coating. The above considerations have been verified by laboratory testsThe practical effectiveness of the new technique has also been demonstrated by the significant suppression of atmospheric corrosion of an overhead pipe.
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