Rare earth-based electrolytic coloring method and alloy product

Abstract

A rare earth-based electrolytic coloring method and an alloy product. The method comprises: once a workpiece has been subjected to anodic oxidation treatment in an electrolyte to form an oxide film, the voltage is rapidly increased, and a constant-voltage mode is adopted, so that under high-frequency, high-voltage and instantaneous high-temperature conditions, the oxide film is broken down, melted, sintered, and re-formed, and the cycle is repeated for multiple times, so as to generate a ceramic film layer metallurgically bonded with a base material. The oxide film is thicker, the reflectivity is lower, and the appearance is a matte black anodized finish with good color consistency and no color difference. The electrolyte comprises sodium silicate with a concentration of 5-70 g / L, sodium tungstate with a concentration of 1-18 g / L, ethylenediaminetetraacetic acid disodium salt with a concentration of 2-10 g / L, and a rare earth salt with a concentration of 1-2 g / L.

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