VCI (volatile corrosion inhibitor) powder metallic finishing coating and preparation method thereof

Abstract

The invention provides a VCI (volatile corrosion inhibitor) powder metallic finishing coating. The VCI powder metallic finishing coating is characterized by comprising base material, filler, VCI and promoter. The base material comprises, by weight, 30-50 parts of polyester powder resin, 5-15 parts of teflon resin and 3-5 parts of curing agent. The filler comprises 1-5 parts of flaky aluminum powder or pearl powder and 20-40 parts of barium sulfate. The promoter is one or more of flatting agent, conductive agent, degassing agent and light stabilizer. The weight ratio of the base material to the filler is 3:1-2:3. The weight of the VCI accounts for 5-10 parts of the total weight of the base material and the filler. The weight of the promoter accounts for 2-10 parts of the total weight of the base material and the filler. The coating is good in shielding effect, has the corrosion inhibiting effect of the VCI, and is capable of excellently protecting metal base materials. Meanwhile, the coating is excellent in decoration performance and weather resistance.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a VCI powder metal finish coating. 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 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 treatment stages use ZnCl2 and NH4Cl solutions, which will generate a large ...

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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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