Abstract: β-Al₂O₃ powdered material could be prepared from the mixtures of Li₂CO₃, Na₂CO₃
and Al₂O₃, 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’’-Al₂O₃ 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 was 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 evaluated for the cathode protection of metal in atmosphere.

Key words: β-Al₂O₃, powdered material, solid electrolytic coating, cathode protection