Conductivity characteristics of electroplated electric heating tubes

Conductivity characteristics of electroplated electric heating tubes

Research has shown that the basic structural unit of graphene is the most stable benzene hexamembered ring in organic materials, making it the most ideal two-dimensional nanomaterial at present. The ideal graphene structure is a planar hexagonal lattice, which can be seen as a layer of stripped graphite molecules. Each carbon atom is sp2 hybridized and contributes the remaining electrons on the p-orbital to form a large π bond. The π electrons can move freely, giving graphene good conductivity. At the same time, due to the double-sided aromatic hydrocarbon structure of graphene, it has a super large specific surface area (theoretical value of 2630m2/g), and therefore has a high loading capacity, making it a promising coating material. Through graphene modification, we have achieved a complete coating method for zinc powder.

2.3 Conductivity characteristics

Special organic resins provide "barrier protection" for the anti-corrosion of cold galvanizing [7]. The mechanism of its action is: firstly, organic resin "barrier protection" is the main method, and at this time, conductive zinc powder is isolated and protected by organic resin, slowing down the oxidation of zinc powder. This is because the organic resin in the cold sprayed zinc coating forms a dense protective barrier layer around the zinc powder particles (with no gaps in the coating), which can effectively resist the infiltration and erosion of external factors such as water, oxygen, and ions. Subsequently, on the cold galvanized surface, zinc powder particles can also combine with CO2 and H2O in the air to form ZnO, Zn (OH) 2, and basic zinc carbonate, filling the gaps in the coating and forming a "self repairing" zinc salt barrier (see equation 1).

When the organic coating is damaged, sacrificial anode zinc powder is mainly used for "cathodic protection". The zinc particles in cold sprayed zinc coatings have large and numerous indirect contact surfaces, tightly arranged voids, and a dry film zinc powder content of up to 96%. The zinc content of the zinc coating on the top of hot dip galvanizing is 96%, and the arrangement of zinc particles has a large spatial and temporal gap. Although zinc particles in cold sprayed zinc coatings are coated with organic resin, due to the low content of organic resin, they form a thin coating, and the resin is a conductive resin. Its conductivity is not limited, and it still has good "cathodic protection".

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