ANTICORROSIVE COATING FOR BURIED BLACK METAL-BASED PIPELINE AND METHOD FOR SPRAYING SAME

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Provided is an anticorrosive composite coating for a buried black metal-based pipeline. The anticorrosive coating comprises a zinc-aluminum-rare earth alloy layer, a zinc-aluminum-rare earth pseudoalloy layer, or a zinc-aluminum-magnesium-rare earth multicomponent pseudoalloy layer. The zinc-aluminum-rare earth alloy layer comprises the following materials by weight percentage : Al : 4.7%-60%, RE : 0.02%-5%, the balance being zinc; the zinc-aluminum-rare earth pseudo-alloy layer comprises the following materials by weight percentage : Al : 5%-60%, RE : 0.02%-10%, the balance being zinc; the zinc-aluminum-magnesium-rare earth metal coating comprises the following materials by weight percentage : Al : 5%-85%, RE : 0.01%-5%, Zn : 30%-95%, and Mg : 0.05%-10%. The coating has low porosity, a good self-closing effect, a stable anticorrosive property, low manufacturing costs, and good economic applicability etc., and can be used in strongly corrosive soil environments.