Preparing method for alloy co-diffusion and Dacromet composite antiseptic coating

Abstract

The invention discloses a preparing method for an alloy co-diffusion and Dacromet composite antiseptic coating. The preparing method comprises the following steps that by mass, following co-diffusion agent raw materials are weighed; the weighed raw materials are evenly mixed, and then a co-diffusion agent is prepared; platy metal pieces with the surfaces cleaned thoroughly are stacked into a stack with the height similar to the width, a layer of co-diffusion agent is laid between every two adjacent platy metal pieces, and packaging and bundling are conducted; the packaged and bundled platy metal pieces are placed in a co-diffusion furnace to be heated and subjected to co-diffusion treatment for 2 h-3 h; Dacromet antiseptic raw materials are weighed, mixed and stirred evenly, pH is adjusted, and Dacromet antiseptic coating liquid is prepared; and the platy metal pieces obtained after alloy co-diffusion treatment are placed in a coating liquid immersing cage, then the coating liquid immersing cage is immersed in the Dacromet antiseptic coating liquid and then drained off to be sent into an online drying device, and baking is conducted for 1.5 h-2.5 h at the temperature of 300 DEG C-350 DEG C. The preparing method is suitable for treating the platy metal pieces in batches.

Description

technical field [0001] The invention relates to the technical field of composite anticorrosion treatment of metal parts, in particular to a method for preparing an alloy co-infiltration and Dacromet composite anticorrosion coating. 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 new type of me...

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