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Method for selective phosphating treatment of composite metal structures

A composite metal and structure technology, applied in the direction of pretreatment surface, metal material coating process, surface coating liquid device, etc., can solve single-point paint damage, uneven coating, and disturb the visual impression of painted surface And other issues

Active Publication Date: 2016-06-29
HENKEL KGAA
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  • Application Information

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Problems solved by technology

Surrounded by subsequent paint primers, this "crystalline cluster" manifests as coating inhomogeneity, which not only interferes with the uniform visual impression of the painted surface, but can also cause single-point paint damage

Method used

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Embodiment Construction

[0015] The material "aluminum" of the present invention also includes aluminum alloys. At the same time, the material "zinc" in the present invention also includes galvanized steel and alloy galvanized steel, while reference to "iron" also includes iron alloys, especially steel. The atomic percentage of impurity atoms in the alloy of the above materials is less than 50%.

[0016] The requirement not to form a zinc phosphate coating on the aluminum part during processing step (i) is to be understood as not producing a continuous sealing crystalline layer on the aluminum part. At least when the mass per unit area of ​​zinc phosphate deposited on aluminum parts is less than 0.5 g / m 2 can satisfy this condition. "Aluminum components" in the present invention are understood to be panels and components made of aluminum and / or aluminum alloys.

[0017] On the other hand, the formation of a continuous crystalline zinc phosphate coating on the steel surface and / or on the surface of ...

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Abstract

The invention relates to a multi-step process for the anticorrosion treatment of composite metal structures of metal surfaces containing aluminum, zinc and optionally iron, wherein, in the first step, the zinc and iron surfaces are selectively treated with a phosphating solution Zinc-based phosphating treatment, the phosphating solution includes a certain amount of water-soluble inorganic silicon compound, the amount of the water-soluble inorganic silicon compound is sufficient to inhibit the formation of pinholes on the zinc surface, but will not exceed the selectivity of the zinc-based phosphating treatment value. In the next second step of the method of the invention, the aluminum surface is passivated with an acid treatment solution. The invention further relates to a zinc-based phosphating solution suitable for use in the process according to the invention, which zinc-based phosphating solution contains at least 0.025 g / l, but less than 1.0 g / l of silicon in the form of a water-soluble inorganic compound, according to SiF6 is calculated by dividing the product of the concentration of silicon in the form of water-soluble inorganic compounds [Si in mM] and the concentration of free fluorine [F in mM] (Si / mM) · (F / mM) divided by free acid points, the quotient does not exceed 5.

Description

technical field [0001] The present invention relates to the anticorrosion treatment of composite metal structures having metal surfaces made of aluminium, zinc and optionally iron using a multi-step process. The method of the present invention allows selective zinc phosphating of zinc and iron surfaces of composite metal structures without depositing significant amounts of zinc phosphate on the aluminum surface. Passivation of the aluminum surface with customary acid treatment solutions thus enables the production of a thin, uniform, corrosion-resistant conversion layer in a subsequent method step. In the method of the invention, the formation of phosphate crystal clusters on aluminum surfaces and the formation of white spots on zinc surfaces are both suppressed. Correspondingly, the present invention also relates to a zinc phosphating solution containing a water-soluble inorganic silicon compound in an amount sufficient to suppress the formation of white spots but not exceed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/00C23C22/36C23C22/73C23C22/83
CPCC23C22/362C23C22/365C23C22/73C23C22/83B05D3/107B05D7/14
Inventor J-W·布劳沃F-O·皮拉雷克M·哈马赫尔M·巴尔策R·波普
Owner HENKEL KGAA
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