A kind of preparation method of composite hot-dip galvanized steel wire

Abstract

Disclosed is a method for preparing a composite hot-galvanized steel wire, comprising the following steps: a high-speed carbon steel wire is drawn for the first time after water bath quenching, then the steel wire drawn for the first time is subjected to hot galvanizing with a hot galvanizing treating solution, and afterwards, the hot-galvanized steel wire is drawn for a second time so that a hot-galvanized steel wire (1) can be obtained; the resulting hot-galvanized steel wire (1) is first degreased and washed with water, and then is soaked with a silane coating agent solution and dried, and a silane coating (2) is generated on the surface of the hot-galvanized layer of the hot-galvanized steel wire (1); and the resulting hot-galvanized steel wire with the silane coating (2) is soaked in a passivation layer treating solution and roasted for 60-180 s at a temperature of 200-260ºC, so that a passivation layer (3) is formed on the surface of the silane coating (2) of the hot-galvanized steel wire, and thus the composite hot-galvanized steel wire can be obtained.

Description

technical field [0001] The invention belongs to the field of steel wires, in particular to a preparation method of composite hot-dip galvanized steel wires. Background technique [0002] As we all know, there are two main types of galvanized steel wire produced / used in the field of metal material processing technology at home and abroad: one is cold-dip galvanized steel wire, and the other is hot-dip galvanized steel wire. [0003] Cold galvanized steel wire is produced by drawing with high carbon steel wire. During production, the product is drawn and formed, washed with water, degreased and rusted, and washed again. After cold galvanizing, it is put into trivalent chromate to form liquid (i.e. the mixture of chromium trichloride and nitric acid, the volume ratio of which is: chromium trichloride: nitric acid = 1:0.8-1.2) is immersed in the aqueous solution for 30-60 seconds, and placed in the air under normal temperature and pressure. Heating at 50-60°C until dry, so that...

AI Technical Summary

Problems solved by technology

Its advantage is that the galvanized layer can be plated very thick, reaching about 200-500 g / m2, and the galvanized layer will not crack or peel off when the steel wire product is used in a state of bending under force or suddenly deformed by an external force. The service life is very long; the disadvantages are: 1) During the hot-dip galvanizing process of the steel wire, due to the shaking of the steel wire, the fluctuation of the zinc liquid level, and the scum on the surface of the plating pot, etc., a local zinc layer accumulation (commonly known as zinc tumor) is formed on the surface of the steel wire. And the zinc ash formed by the oxidation of part of zinc into oxides and other zinc compounds adheres to the surface of the steel wire zinc layer, so that the surface of the galvanized layer is pitted and uneven, the surface is dull and has no brightness, and the surface effect is very poor; The products produced by hot-dip galvanized steel wire cannot attract customers because of their ugly appearance, and the sales effect is not good; At 70°C, the corrosion resistance of the chromic acid film will drop sharply

[0005] In the prior art, good corrosion resistance is often obtained by adjusting the element ratio of the steel itself or coating a single passivation layer on the surface of the steel wire, but there are still various deficiencies, such as increased costs, too cumbersome process or poor passivation layer effect. Good, which limits the application of hot-dip galvanized steel wire

Images