Cold-spraying graphene-zinc coating and preparation method thereof

Abstract

The invention discloses a cold-spraying graphene-zinc coating. The cold-spraying graphene-zinc coating comprises 3 to 6 parts of acrylic resin, 3 to 10 parts of pure thin graphene slurry, 12 to 20 parts of a mixed solvent, 75 to 80 parts of zinc powder, and 1 to 3 parts of an anti-settling agent. The invention also discloses a preparation method of the cold-spraying graphene-zinc coating. According to the invention, the modified pure thin graphene is adopted, the compactness and thick film cracking resistance of the coating layer can be effectively improved, meanwhile, the sheet structure of the pure thin graphene endows the coating layer with excellent barrier property, and the synergistic effect of the pure thin graphene and the zinc powder can greatly improve the cathodic protection effect and the corrosion inhibition effect of the coating layer, so that the protection life of the cold-spraying graphene-zinc coating is prolonged.

Description

technical field [0001] The invention relates to a cold-sprayed olefinic zinc coating and a preparation method thereof, belonging to the technical field of chemical materials and processes. Background technique [0002] Heavy-duty Coating refers to a type of anti-corrosion coating that can be applied in a relatively harsh corrosive environment compared with conventional anti-corrosion coatings, and has a longer protection period than conventional anti-corrosion coatings, that is, it has long-term anti-corrosion properties. life. For example, heavy-duty anti-corrosion coatings can generally be used for more than 10 or 15 years in chemical atmospheres and marine environments, and can be used for more than 5 years even in acid, alkali, salt and solvent media and under certain temperature conditions. [0003] Cold spray galvanizing is a high-performance heavy-duty anti-corrosion coating that has been more and more widely used in recent years. It can replace hot-dip galvanizing. ...

AI Technical Summary

Problems solved by technology

However, there are some shortcomings in the application of cold-sprayed zinc. The zinc powder content in the cold-sprayed zinc dry film reaches more than 95%, and the resin content is low. Since the zinc powder is granular metal, there will be gaps between the arrangements, resulting in zinc coating poor sealing

If the content of zinc powder in cold-sprayed zinc is reduced and the content of resin is increased, although the compactness will be better, the effect of cathodic protection will be affected, which will eventually affect its anti-corrosion performance, and the effect of hot-dip galvanizing and hot-sprayed zinc will not be achieved.

At the same time, due to the low resin content and poor adhesion of cold-sprayed zinc, the paint film is prone to cracking when the single-layer thickness exceeds a certain thickness.

[0004] In the prior art, in order to solve this problem, a sealing agent is generally applied on the cold-galvanized surface to achieve an ideal anti-corrosion effect, but the operation steps are cumbersome, and the solvent in the sealing agent is easy to damage the lower layer of cold-sprayed zinc coating. Occurrence of seeping and biting will easily lead to a decrease in coating adhesion, and in severe cases, the paint film will crack and fall off. At the same time, there are strict requirements on the construction process and film thickness control, and the on-site construction is not easy to control

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