Chromium-free passivation solution for zinc-aluminum-magnesium steel plate and preparation method of chromium-free passivation solution

• Main Authors: WU FUSHENG, ZHU ZHENYU, XIE ZILIN, ZHU JIANFENG
• Format: Patent
• Language: Chinese; English
• Published: 19.01.2024
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to the technical field of passivation solutions, and discloses a chromium-free passivation solution for a zinc-aluminum-magnesium steel plate and a preparation method thereof.The chromium-free passivation solution is prepared from, by mass, 40%-60% of a chromium-free film forming agent, 0.1%-1% of nanoparticles, 0.1%-0.5% of a lubricating agent, 5%-15% of a chelating agent, 0.1%-1% of a corrosion inhibitor and the balance water. The pH regulator is selected from an alkaline or acidic solution, the pH value of the chromium-free passivation solution is regulated in an acidic range or an alkaline range, the acidic range is pH 3-6, and the alkaline range is pH 8-11. The chromium-free passivation solution can improve the corrosion resistance, the wear resistance and the lubricity of the zinc-aluminum-magnesium steel plate, prolong the service life of the zinc-aluminum-magnesium steel plate and reduce the maintenance cost and the environmental influence. In addition, the preparation method of