Galvanized steel sheet passivating agent and preparation method thereof

Abstract

The invention provides a galvanized steel sheet passivating agent and a preparation method thereof. The galvanized steel sheet passivating agent is prepared from the following components: phytic acid, 1-hydroxyl ethylidene bisphosphoric acid, nitrilotrimethylene phosphonic acid, ethanediamine tetramethylene phosphonic acid, sodium silicate, sodium formate, polyvinyl alcohol, sodium benzoate, triethanolamine, aluminum dihydrogen phosphate, sulfosalicylic acid, vanadiumoxy acetylacetonate, gamma-aminopropyltriethoxysilane, 2-acrylamido-2-methyl propane sulfonic acid, N, N-dimethyl acrylamide, silicon oxide filler, water-soluble film-forming resin and deionized water. The preparation method of the galvanized steel sheet passivating agent comprises the following steps: adding phytic acid, 1-hydroxyl ethylidene bisphosphoric acid, nitrilotrimethylene phosphonic acid, ethanediamine tetramethylene phosphonic acid, sodium silicate, sodium formate and polyvinyl alcohol into the deionized water, thereby forming a mixture I; then, mixing parts of the components with the deionized water, thereby forming a mixture II; and finally, mixing the mixture I with the mixture II, and then adding the residual components, thereby forming the galvanized steel sheet passivating agent. The galvanized steel sheet passivating agent does not contain chromium; and a galvanized steel sheet passivated by the galvanized steel sheet passivating agent has relatively high corrosion resistance and oxidization resistance.

Description

technical field [0001] The invention belongs to the field of metal surface treatment chemistry, and in particular relates to a galvanized steel plate passivator and a preparation method thereof. Background technique [0002] Metal passivation treatment refers to the method of converting the metal surface into a state that is not easily oxidized due to the action of the medium, so as to delay the corrosion rate of the metal. The passivation of metals may also be a spontaneous process (such as the formation of a layer of insoluble compounds on the surface of the metal, that is, an oxide film). In industry, passivating agents (mainly oxidizing agents) are used to passivate metals to form a protective film. [0003] Galvanized steel sheet is one of the important protective means of cold-rolled steel sheet, which is widely used in aviation, electric power, transportation, construction, machinery and other industries. The galvanizing process is mainly divided into electro-galvan...

AI Technical Summary

Problems solved by technology

[0004] Although the galvanized steel sheet already has a strong anti-corrosion ability, the galvanized steel sheet is still prone to corrosion in a humid environment, forming white corrosion products or turning gray on the surface, which affects the appearance quality and quality of the galvanized steel sheet. Plating corrosion resistance