A kind of ph regulator and the water-based steel structure anticorrosion coating containing it to prevent weld flash rust and preparation method

Abstract

The invention relates to the technical field of anti-corrosion coatings, and specifically discloses a pH regulator, a water-based steel structure anti-corrosion coating for preventing flash rust of welding seams containing the pH regulator, and a preparation method thereof. The pH adjuster is prepared from DMAE, water and a strong alkali aqueous solution of an active metal according to the mass ratio (1-5): (1-2): (0.1-0.5). The water-based steel structure anticorrosion coating is made of the following raw materials in parts by weight: 30-40 parts of polymer emulsion, 15-25 parts of anti-rust filler, 10-20 parts of talcum powder, 0.1-1 part of anti-flash rust additive, pH Regulator 0.1-1.5 parts, water 20-30 parts. The water-based steel structure anti-corrosion coating can not only prevent the flash rust of the main body of ordinary steel structures, but also has a significant inhibitory effect on the flash rust at the weld, can effectively inhibit the weld flash rust, and completely solve the problem of rapid corrosion during the use of water-based coatings. The problem, moreover, is good long-term storage stability.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a pH regulator and a water-based steel structure anti-corrosion coating containing the same for preventing weld flash rust and a preparation method. Background technique [0002] Metal rusting and corrosion is a complex process. Taking metal iron as an example, there are two types of rust and corrosion of iron: oxygen absorption corrosion and hydrogen evolution corrosion. [0003] Iron is prone to oxygen absorption corrosion in neutral solution, alkaline solution, and weakly acidic electrolyte solution, and oxygen absorption corrosion is more common. The main reaction formula of oxygen absorption corrosion is as follows: [0004] Negative electrode (Fe): 2Fe - 4e - = 2Fe 2+ ; [0005] Positive electrode (C): O 2 +4e - +2H 2 O = 4OH - ; [0006] Overall reaction formula: 2Fe+O 2 +2H 2 O = 2Fe(OH) 2 . [0007] Due to Fe(OH) 2 Unstable, easy to be O 2...

AI Technical Summary

Problems solved by technology

But the disadvantage is that it is not environmentally friendly, toxic, pollutes water resources, and is suppressed by all aspects of society, especially nitrite is prone to lose anti-flash rust inhibitory activity in water-based systems

The second type is the product compounded by organic polymer amines. The commonly used ones are organic zinc chelates, which show strong affinity to iron substrates and prevent flash rust. Organic zinc chelates are coated on the surface of metal substrates. After that, it can effectively grab the free metal ions on the metal surface, form an anion passivation layer, and effectively prevent the oxidation of cathode metal ions; The effect of the area is not good, it is difficult to completely eliminate the appearance of rust spots

[0017] To sum up, the water-based steel structure coatings currently on the market tend to have better flash rust inhibition on the main body of the steel structure, and there will be no rust spots when sprayed on a large area, but more often appear at the weld seam of the steel structure. Rust spots, there are very few products that can effectively prevent welds from rusting. Even if there are, the problem is temporarily solved by adding a large amount of anti-flash rust additives. While the cost increases, the storage stability of the product is also poor

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