大气中金属阴极保护用β-Al_2O_3粉体材料的制备与性质

Preparation and Characteristic of β-Al_2O_3 Powdered Material as Electrolytic Coating for Cathode Protection in Atmosphere

研究了β－ＡＩ２Ｏ３粉体材料的制备工艺与性质迪种粉体材料可以采用慢速升温、分阶段保温的工艺，煅烧Ｌｉ２ＣＯ３、Ｎａ２ＣＯ３、ＡＩ２Ｏ３的均匀混合物不经球直接制得，根据使用要求与生产５条件，混合物可用干混、兰湿混－过筛或喷雾干燥法来制备、粉体材料主要由β／β＂－ＡＩ２Ｏ３组成，β＂相的相对含量〉７０％，加入适当的粘结剂与溶剂，可将其制臧在气环境中金属管道外的固体电解质涂层。

β-Al_2O_3 powdered material could be prepared from the mixtures of Li_2CO_3, Na_2CO_3 and AL_2O_3, which were obtained by dry mixing, wet mix-screening or spray-drying process, by stepped calculating without grinding. The effect of preparation condition on the properties of the powdered material was showed. The powder composed of β/β'-Al_2O_3 in principle, f(β~')>70%, could be fabricated into solid electrolytic coating for metal pipeline in atmosphere, with some binders and solvents. The powder in the coating wus stable chemically and electrochemically to metal, binders and moistur. The polarization behavior of cathode for 'Beta-coating' showed that there was a flat at the polarization curve, which could be evajuated for the cathode protection of metal in atmosphere.