Infrastructure construction metal part alloy co-permeation and Dacromet composite anti-corrosive coating

Abstract

The invention discloses an infrastructure construction metal part alloy co-permeation and Dacromet composite anti-corrosive coating which comprises an alloy co-permeation agent and a Dacromet coating solution, wherein the alloy co-permeation agent comprises zinc powder, aluminum powder, alumina powder, nickel powder, cerium (III) oxide powder and ammonium chloride, and is prepared by uniformly mixing the zinc powder, the aluminum powder, the alumina powder, the nickel powder and the cerium (III) oxide powder, heating the mixture to 150-200 DEG C, performing heat preservation for 30-50 minutes, cooling to the room temperature, and then uniformly mixing the cooled mixture with ammonium chloride; the Dacromet coating solution comprises a composition A and a composition B; the composition a zinc sheet, an aluminum sheet, deionized water and fatty alcohol-polyoxyethylene ether; the composition B comprises the following components in parts by mass: an amorphous complex molybdate compound, barium acid salt, hydrogen peroxide and 1-3 parts of polyethylene glycol; and the Dacromet coating solution is prepared by mixing the composition A with the composition B for uniform stirring, and then regulating the pH value of the obtained mixture to be 3.5-5.0 by adopting a pH regulator.

Description

technical field [0001] The invention relates to the technical field of anticorrosion treatment of infrastructure metal parts, in particular to an alloy co-infiltration and Dacromet composite anticorrosion coating for infrastructure metal parts. Background technique [0002] Every year, the world's steel corrosion loss accounts for more than 10% of the total steel output, and the economic loss caused by corrosion in industrially developed countries accounts for more than 2% to 4% of the total output value of the national economy; research and develop advanced anti-corrosion technology to reduce economic losses caused by corrosion Prolonging the service life of steel and other metal materials and equipment is of great significance to promoting the development of advanced technology, cutting-edge science and defense industry, as well as the sustainable and coordinated development of the national economy and social environment. [0003] Multi-element alloy co-infiltration is a n...

AI Technical Summary

Problems solved by technology

[0004] Dacromet, also known as Dacromet rust, high-gram rust, zinc-chromium film, etc., refers to coating the metal substrate with a liquid treatment solution containing zinc flakes, aluminum flakes, chromic anhydride, ethylene glycol, etc. After baking, a layer of non-decorative coating film with excellent corrosion resistance is formed on the surface of the metal substrate. The disadvantage is that the surface hardness is insufficient

In addition, since chromium plays a key role in Dacromet coating metal anti-corrosion technology, its content in the slurry is more than 20-26 mg per liter. The curing process of Dacromet coating is that hexavalent chromic acid In the process of being reduced by organic substances such as ethylene glycol, water-insoluble, amorphous trivalent chromium is generated as a binder, which combines with dozens of layers of laminated zinc sheets on the metal surface to form a denser 5-12 microns. Chromium zinc chromium coating; therefore, chromium exists at all times in the processing and application of Dacromet, from raw material storage and transportation to slurry preparation, coating and curing of Dacromet, and finally to use. Possibility of Chromium Contamination