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

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The invention discloses a composite anti-corrosion coating for a buried ferrous metal-based pipeline. The anti-corrosion coating contains a zinc-aluminum-rare earth alloy layer, a zinc-aluminum-rare earth pseudo-alloy layer or a zinc-aluminum-magnesium-rare earth multi-element pseudo-alloy layer, wherein the zinc-aluminum-rare earth alloy layer comprises the following components in percentage by weight : 4.7-60% of Al, 0.02-5% of RE and the balance of Zn; the zinc-aluminum-rare earth pseudo-alloy layer comprises the following components in percentage by weight : 5-60% of Al, 0.02-10% of RE and the balance of Zn; and a zinc-aluminum-magnesium-rare earth metal coating comprises the following components in percentage by weight : 5-85% of Al, 0.01-5% of RE, 30-95% of Zn and 0.05-10% of Mg. The coating disclosed by the invention has the advantages of low porosity, good self-sealing effect, stable anti-corrosion performance, low manufacturing cost, good economic applicability and the like, and can be applied in a highly corrosive soil environment.