Long-life anti-corrosive layer for transmission tower and method for making same

Abstract

The invention relates to a long-life anti-corrosive layer for a transmission tower and a method for making the same. The long-life anti-corrosive layer has a composite structure consisting of metal, non-metal and organic matter, wherein a thermally zinc-sprayed bottom layer is sprayed by electric arc by using zinc alloy; an epoxy zinc-rich heavy anti-corrosion enclosed middle layer comprises epoxy resin, zinc powder, a curing agent and a thinner, and is implemented via a high-pressure airless sprayer; a modified acrylic nano surface layer comprises isocyanate additive, modified acrylic resin, a mixture of pigment and filler, the curing agent and a solvent; and a coating method adopts conventional methods such as a brushing method, a rolling method, a spraying method and the like. The invention has the following beneficial effects that: the epoxy zinc-rich heavy anti-corrosion enclosed middle layer is used to enclose a zinc-sprayed layer instead of chromate, and has excellent anticorrosive property; the technology can replace hot galvanizing, lower the production cost, save energy source, eliminate pollution of the three wastes, and prolong the service life to more than 50 years for primary treatment; and the technology is applicable for the fields of electric power, transportation, chemical industry and the like, and has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of metal material surface anti-corrosion treatment technology, in particular to a long-life anti-corrosion layer for transmission towers and a manufacturing method thereof. Background technique [0002] Transmission towers are special facilities that transmit electricity from power plants (stations) to substations, and then from substations at all levels to users. In order to reduce the loss of electric energy during long-distance transmission (such as thousands of kilometers from west to east in my country), it is usually necessary to boost the electric energy of the power plant (station) to a high-voltage or ultra-high-voltage state. At present, my country's power transmission and distribution level has reached 750kv, and the 1000kv ultra-high voltage transmission and distribution technology has also been tested successfully. With the improvement of power transmission and distribution level, transmission towers are...

AI Technical Summary

Problems solved by technology

Hot-dip galvanizing is a widely used traditional anti-corrosion process with good anti-corrosion effect, but it will cause thermal deformation when used in steel pipe towers for power transmission: steel pipe rods are usually made into conical multi-edged hollow cylinders, which are easily damaged after hot-dip galvanizing. Deformation, due to the irregular shape and different top and bottom, mechanical straightening cannot be carried out after the steel pipe rod is deformed, most of them are straightened by flame baking, which in turn destroys the galvanized layer and reduces the overall anti-corrosion performance; The layer is a porous and loose structure. Water, air and various electrolytes can pass through the gaps into the zinc spray layer or contact the substrate, resulting in a decrease in the anticorrosion effect of the thermal spray zinc layer.