Anti-corrosion composite layers

Abstract

An anti-corrosion composite layer includes a first anti-corrosion coating coated on a substrate, and a second anti-corrosion coating coated on the first anti-corrosion coating. The first anti-corrosion layer includes a plurality of first graphene nanosheets and a first carrier resin, wherein a surface of each the first graphene nanosheet has a first lipophilic functional group for chemically bonding to the first carrier resin, the first lipophilic functional group is selected from carboxyl, epoxy and amino. The second anti-corrosion coating includes a plurality of second graphene nanosheets and a second carrier resin, wherein a surface of each the second graphene nanosheet has a second lipophilic functional group for chemically bonding to the second carrier resin, the second lipophilic functional group is selected from hydroxyl and isocyanic acid group.

Description

technical field [0001] The invention relates to an anti-corrosion composite layer, in particular to an anti-corrosion composite layer composed of a plurality of anti-corrosion layers containing nanometer graphene sheets. Background technique [0002] According to statistics, the economic development of a country is closely related to the corrosion of materials. It is difficult to estimate the annual loss caused by corrosion in the world. Although the ratio of the total loss due to corrosion to its national economic production capacity in each country is different, the amount is different. Quite huge, the loss caused by corrosion cannot be ignored. Take Taiwan, China as an example. It is located in an area surrounded by the sea. The climate is humid and easily affected by sea breeze salt and industrial pollutants, and the corrosion is very serious. In addition to the economic losses caused by corrosion itself, the indirect losses caused by the downtime associated with corros...

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Problems solved by technology

However, the weight ratio of graphene, zinc powder and fillers in the epoxy resin component described in this patent is as high as 60 to 80%. Except that too high a filler content may cause pores or channels in the resin layer to cause corrosion, graphite The poor affinity between graphene and fillers may cause the problem that graphene cannot be uniformly dispersed between resin, zinc powder and fillers

[0007] European Patent No. 2886616A1 mentions the use of graphene to replace the chromate corrosion inhibitor in the paint to produce a chromium-free anti-corrosion coating, but it is a water-based coating, and its corrosion resistance is the same as that of general chromium salt anti-corrosion coatings far from

However, this multi-layer corrosion-resistant coating system is made through multiple drying and curing steps. The flatness of each coating after curing involves the porosity between different coatings and the overall thickness of the multi-layer corrosion-resistant coating. The porosity between the coatings affects the weather resistance and corrosion resistance of the corrosion-resistant coating. The multi-layer corrosion coating with too large overall thickness is not easy to construct. Moreover, the multi-layer corrosion coating still uses traditional anti-rust pigments, such as Iron oxide yellow, zinc phosphate, chrome green and other heavy metal pigments have environmental pollution problems

[0009] In addition, Japanese Patent No. 2002239455A discloses a method of forming a coating film using a coating composition composed of acrylic resin, epoxy resin and isocyanate compound, but the coating film cannot completely and effectively suppress the coating film deterioration caused by salt spray. Therefore, it cannot meet the corrosion resistance under severe service conditions

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