VCI powder zinc-rich coating for steel structure surface protection and preparation method thereof

Abstract

The invention provides VCI powder zinc-rich paint for protecting the surface of a steel structure. The VCI powder zinc-rich paint is characterized by comprising, by weight, base material, filling, VCI (volatile corrosion inhibitor) and auxiliary, the base material comprises 20-50 parts of epoxy powder resin, 20-50 parts of polyester powder resin, 30-60 parts of sheet zinc powder, 5-10 parts of aluminum triphosphate and 5-10 parts of zinc phosphate, the auxiliary is one or multiple of flatting agent, electroconductive agent and degassing agent, a mass ratio of the base material to the filling is 3:1-3:7, mass of the VCI is 5-10 parts of total mass of the base material and the filling, and mass of the auxiliary is 2-10 parts of the total mass of the base material and the filling. The VCI powder zinc-rich paint has good shielding effect that powder paint has, has cathode protecting effect equivalent to common zinc-rich paint and has corrosion inhibiting effect that the VCI has, so that excellent protecting effect on metal base materials is realized.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a VCI powder zinc-rich coating for steel structure surface protection and a preparation method thereof. Background technique [0002] Hot-dip galvanizing is also called hot-dip galvanizing. It is to immerse the rust-removed steel components in a zinc solution melted at a high temperature of about 600 ° C, so that the surface of the steel components is attached with a zinc layer. The above thick plate is not less than 86μm. As an effective metal anti-corrosion method, hot-dip galvanizing process has been widely used in metal structure facilities in various industries. [0003] Existing hot-dip galvanizing construction techniques such as figure 1 As shown, however, the existing hot-dip galvanizing construction technology has many defects: [0004] (1) The pickling process uses 20% hydrochloric acid, which will produce a large amount of acid waste liquid. The activation and exposure treat...

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Problems solved by technology

[0004] (1) The pickling process uses 20% hydrochloric acid, which will produce a large amount of acid waste liquid. The activation and exposure treatment stages use ZnCl2 and NH4Cl solutions, which will generate a large amount of industrial wastewater. If they are directly discharged, they will cause damage to water resources and soil resources. Severe pollution and high cost of wastewater treatment;

[0005] (2) A large amount of coal resources need to be consumed in this process to maintain the temperature of the zinc bath, which results in a serious waste of energy

[0006] (3) The construction process is complex and the construction environment is harsh

During the construction process, a large amount of waste gas and waste liquid are generated, and the treatment is difficult, causing pollution to the surrounding environment

[0007] (4) Serious waste of zinc resources

However, because powder coatings do not have the electrochemical cathodic protection effect of zinc-rich coatings, powder coatings must be combined with hot-dip galvanizing, electro-galvanizing or other cathodic protection systems when they are applied in the field of heavy-duty corrosion protection, which not only increases the project cost but also caused a great waste of resources

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