VESTAGON B 1530 can be mixed with polyesters with large number of terminal hydroxyl groups to produce durable and decorative powder coatings with excellent process coating properties.
After the adsorption film type corrosion inhibitor is added to the corrosive medium, the charge state and interface properties of the metal surface are changed by adsorption on the one hand, the energy state of the metal surface tends to be stabilized, the activation energy of the corrosion reaction is increased, and the corrosion rate is slowed down; On the one hand, the non-polar groups on the adsorbed corrosion inhibitor molecules can form a hydrophobic protective film on the metal surface, which hinders the transfer of charges or substances related to the corrosion reaction, and also reduces the corrosion rate. According to the different forms of adsorption, it can be divided into chemical adsorption, electrostatic adsorption or x-bonded orbital adsorption. The adsorption film type corrosion inhibitor used in the coating should have good compatibility with the resin in the coating, because excessive corrosion inhibitor can cause the loss of adhesion or act like a release agent. In the presence of corrosion inhibitors, adhesion promoters can be used.
Variety and composition of corrosion inhibitor
Inorganic corrosion inhibitor
As people pay more and more attention to environmental protection, it is becoming more and more important to use non-toxic phosphates in paints to replace blue chromium and lead products. ptfe powder suppliers uk The zinc phosphate, either alone or in the form of a proprietary pigment that is combined with other materials to keep the ingredients secret, is showing an upward trend in the application of paint industrial towels. Zinc phosphate is not an alkaline substance, so it can be used in many types of coatings. Medium. The solubility of zinc phosphate in water is very low, and it is not easy to migrate to the surface of the coating.
Zinc phosphate can be used as a treatment agent for steel or as a pigment in coatings. Zinc phosphate inhibitors are generally divided into unmodified zinc phosphate and modified zinc phosphate. When moisture passes through the coating film, zinc, iron and water can react to form a combination of zinc phosphate and zinc phosphate. Hydrates, they help prevent the loss of film adhesion.
Zinc phosphate can be used in conjunction with calcium hydroxide, magnesium hydroxide or zinc oxide to improve the anti-corrosion effect. It can also be used in conjunction with molybdate and tungstate corrosion inhibitor pigments for better results, especially if the metal surface is not completely removed. When there is rust, the modified zinc phosphate of Heubach GmbH & Co., Germany, with the brands Heucophos ZPO and Z PA, has improved dispersibility and improved the corrosion resistance of the coating. Among them, HeucophosZPO is Albright & Wilson Company 331 of the United Kingdom modified with zinc carboxylate, which produces magnesium phosphate and calcium phosphate inhibitory pigments for coatings, and NL Chemical Company of the United States produces zinc hydroxyphosphite under the trade name Nal z. in 2.
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