VCI powder bimetallic coating for steel structure surface protection and preparation method thereof

Abstract

The invention provides a VCI (Vapor Corrosion Inhibitor) powder bimetallic coating for steel structure surface protection and a preparation method thereof. The ofpowder bimetallic coating comprises the following components in parts by weight: a binder, a filler, a VCI vapor corrosion inhibitor and an auxiliary, wherein the binder comprises 15-25 parts of powdered epoxy resin, 15-25 parts of powdered polyester resin, 5-15 parts of polytetrafluoroethylene resin, and 5-15 parts of organic silicon resin; the filler comprises 30-60 parts of flake zinc powder, 1-5 parts of flake aluminum powder, 5-10 parts of aluminum triphosphate, and 5-10 parts of zinc phosphate; the auxiliary is selected from one or more of a flatting agent, a conductive agent, a degassing agent and a light stabilizer; the mass ratio of the binder to the filler is 3:1 to 1:2.5; the mass of the VCI vapor corrosion inhibitor is 5-10% of the total mass of the binder and the filler; the mass of the auxiliary is 2-10% of the total mass of the binder and the filler. The coating plays a good shielding role as a powdered coating, further plays a cathode protection role as a common zinc-rich coating, and meanwhile takes a corrosion inhibition effect as the VCI vapor corrosion inhibitor, so as to achieve the excellent protection effect for the metal binder. In addition, the powdered coating disclosed by the invention is prepared by mixing different weather-resistant resins, so that the powdered coating has better weather resistance than the common powdered coating.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a VCI powder bimetallic 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] The existing hot-dip galvanizing construction technology mainly includes: [0004] [0005] However, the existing hot-dip galvanizing construction technology has many defects: [0006] (1) The pickling process uses 20% hydrochloric acid, which will produce a large amount of acid waste liquid. The activation an...

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Problems solved by technology

[0006] (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;

[0007] (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

[0008] (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

[0009] (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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