Electrocorrosion marking liquid for low-aluminum zinc-aluminum-magnesium coating plate and grid printing method

The invention provides a low-aluminum zinc-aluminum-magnesium coating plate electrocorrosion marking solution and a grid printing method. The marking solution comprises 0.02%-0.1% of sodium fluoride, 0.5%-1% of sodium dodecyl sulfate, 0.5%-1.0% of anhydrous cupric sulfate, 0.2%-0.5% of hydrochloric acid, 0.2%-0.5% of sulfuric acid, 0.2%-1% of ammonium chloride, 0.2%-0.5% of sodium nitrate and 95.4%-98.18% of water. Compared with the prior art, the low-aluminum-series zinc-aluminum-magnesium coating plate marking liquid is specially designed for coating components of a low-aluminum-series zinc-aluminum-magnesium coating plate containing 1-5% of Al, 1-3% of Mg and the balance Zn, and the influence of the Mg element in the coating on grid printing is avoided. And designing a matched grid printing method and parameters. The marking liquid is used for marking to form lines with clear visual contrast, and the grids are not easy to fade and fall off. The special marking liquid is suitable for grid printing on the su