Fluoride-free zirconium-based metal pretreatment for passivation
A pretreatment and fluoride technology, which is applied in the coating process of metal materials, etc., can solve problems such as environmental protection problems
Active Publication Date: 2021-07-20
HENKEL KGAA
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Problems solved by technology
Advantageously, the corrosion inhibitors applied in this method are also substantially free of fluoride-releasing compounds, which are problematic in terms of environmental protection
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[0007] In the context of the present invention, if at 20°C, the compound (A) of the element zirconium has an electrical conductivity of less than 1 μScm -1 It is water-soluble if its solubility in deionized water is at least 0.1 g of compound / kg of the resulting aqueous solution, and the weight of compound (A) of elemental zirconium is based on elemental zirconium.
[0008] In the method according to the invention, it is ensured that after the acid-etching action on the metal substrate, the metal substrate is passivated by a surface coating based on the element zirconium and poorly soluble compounds of polycyclic hydrocarbons. Furthermore, metal substrates pretreated according to the invention and thus provided with a corresponding surface coating are extremely suitable for producing excellent paint bases for subsequent primers containing film-forming organic resins; for this purpose, aqueous corrosion inhibitors can additionally contain organic polymer without negatively affe...
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Abstract
The present invention relates to a method for the anticorrosion pretreatment of metal substrates with an aqueous zirconium-based anticorrosion agent. The anticorrosion effect of zirconium-based agents relies on the presence of polycyclic hydrocarbons having at least one fused benzene ring each having at least two ring-substituted hydroxyl groups in an ortho position with respect to each other . The aqueous corrosion inhibitor may be substantially free of chromium-containing compounds having a passivating effect and fluoride-containing compounds having an acid-etching effect on metal substrates. According to the invention, pretreatment by drying (drying in situ) is particularly advantageous. The method according to the invention is therefore particularly suitable for the pretreatment of metal strips in which an excellent corrosion protection effect is obtained on aluminum or steel surfaces. The present invention also relates to a method for producing coated can ends from aluminum strip using the zirconium-based corrosion inhibitor described above. Additional aspects include aqueous concentrates for providing ready-to-use corrosion inhibitors.
Description
technical field [0001] The present invention relates to a method for the anticorrosion pretreatment of metal substrates with an aqueous zirconium-based anticorrosion agent. The anticorrosion effect of zirconium-based corrosion inhibitors relies on the presence of polycyclic hydrocarbons having at least one fused (anellated) benzene ring, which in each case has at least two Hydroxyl groups that are ortho-substituted with respect to each other on the ring. The aqueous corrosion inhibitor may be substantially free of chromium-containing compounds having a passivating effect and fluoride-containing compounds having a pickling effect on metal substrates. According to the invention, pretreatment by drying (drying in situ) is particularly advantageous. The method according to the invention is therefore particularly suitable for the pretreatment of metal strips, obtaining excellent corrosion protection on aluminum or steel surfaces. The present invention also includes a method of p...
Claims
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IPC IPC(8): C23C22/48C23C22/53C23C22/56C23C22/34
CPCC23C22/34C23C22/48C23C22/53C23C22/56B21D28/00C23F11/04
Inventor J·里索帕V·盖克
Owner HENKEL KGAA