Surface treatment method of steel structure rod piece with cavity

Abstract

The invention discloses a surface treatment method of a steel structure rod piece with a cavity and belongs to the technical field of surface treatment of metal construction members. According to the surface treatment method, a lead-out and guide technique is used to lead out and guide air in the cavity of the steel structure rod piece with the cavity to the position above pickle liquor, surface conditioning liquor and a liquid state zinc surface to conduct a galvanizing process. According to the invention, a tubule guide technique is used to solve problems of air explosion and zinc absorption and leaving in the cavity when the metal construction members are subjected to galvanizing, the cost of the surface treatment method of the existing steel structure rod piece with the cavity is reduced, the surface treatment effects of the steel structure rod piece with the cavity are good, and the service life is long.

Description

technical field [0001] The invention relates to a method for surface treatment of a steel structure rod with a cavity, and belongs to the technical field of surface treatment of metal components. Background technique [0002] There are three kinds of surface treatment technologies for existing metal rods with cavity: one is to spray or brush special paint for steel structure after the metal components are shot blasted and derusted, which is characterized by low cost and poor anti-corrosion effect; It is to spray the metal rod with cavity after pickling and derusting (or phosphating). It is characterized by smooth surface, easy coloring and good anti-corrosion performance. The disadvantage is that it is afraid of impact and easy to peel off in a large area; The third is to treat the metal rods with a cavity by spraying zinc on the surface. Usually, galvanized pipes are used. The steps are to cut the galvanized pipes according to the requirements → dezincify the two ends of th...

AI Technical Summary

Problems solved by technology

[0002] There are three kinds of existing surface treatment technologies for metal rods with cavity: one is to spray or brush the special paint for steel structure after the metal components are shot blasted and derusted, which is characterized by low cost and poor anti-corrosion effect; It is to spray the metal rod with cavity after pickling and derusting (or phosphating). It is characterized by smooth surface, easy coloring, and good anti-corrosion performance. The disadvantage is that it is afraid of impact and easy to peel off in large areas; The third method is to spray zinc on the surface of metal rods with a cavity, usually using galvanized pipes. The steps are to cut the galvanized pipes according to the requirements → perform high-temperature dezincification on the two ends of the pipes as required → weld flat, Cone head → spray zinc on the weld; the disadvantages of this process are: the cost of galvanized pipes is high, and the temperature is not easy to control during high temperature dezincification; the strength of the weld is easily affected by the unclean dezincification; the weld It is not easy to form a zinc-iron alloy layer when spraying zinc, and the zinc layer is not strong enough to cause the welding seam to be easily packaged

The hot-dip galvanizing technology is a convenient surface treatment method that can improve the galvanizing effect, but if the steel structure rod with a cavity is directly put into the zinc liquid, zinc will also be adsorbed inside the rod, which is very expensive; When both ends of the rod are blocked and put into zinc liquid, gas explosion will occur. Therefore, for steel structure rods with cavity, people generally do not use hot-dip galvanizing.