Method for coating metal surface with activating agent prior to phosphating

A metal surface, activator technology, applied in the device for coating liquid on the surface, pretreatment surface, metal material coating process, etc., can solve the problems of reduced paint adhesion, high layer weight, and high chemical consumption

Active Publication Date: 2017-07-14
CHEMETALLGMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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But lower paint adhesion and higher chemical con

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  • Method for coating metal surface with activating agent prior to phosphating
  • Method for coating metal surface with activating agent prior to phosphating
  • Method for coating metal surface with activating agent prior to phosphating

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Embodiment and

[0146] Embodiment and comparative example:

[0147] The subject matter of the invention is described in more detail by working examples. The examples were carried out using the following substrates, method steps, substances and mixtures:

[0148]The test plate consists of cold-rolled steel (CRS) or double-sided galvanized steel with a thickness of 1.2 mm and has a hot-dip galvanized (HDG) or electrogalvanized (EG) coating on each side with a thickness of about 7 μm each . The area of ​​the substrate measured on both sides is about 400 cm 2 .

[0149] a) Clean and fully degrease the surface of the substrate in a 2.5% solution of alkaline detergent at 60°C for 10 minutes.

[0150] b) Then rinse with tap water for 0.5 minutes at room temperature.

[0151] c) The surface is then activated by immersing it in a colloidal activator comprising titanium phosphate for 0.5 minutes at room temperature. Activators are described in Table 2. Activator A is prepared by mixing at eleva...

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Abstract

The invention relates to a method for coating metal surfaces with an activating agent prior to phosphating. To be specific, the invention relates to a method for phosphating metal surfaces in which the metal surfaces are treated with an aqueous phosphate and titanium-based colloidal activating agent prior to phosphating, wherein the activating agent comprises at least one water-soluble silicon compound having at least one organic group. The invention also relates to a corresponding activating agent.

Description

[0001] This patent application is a divisional application of a Chinese patent application with the same title as December 9, 2009 and application number 200980156325.6. technical field [0002] The invention relates to a method for phosphatizing metal surfaces, in which, prior to phosphating, the metal surface is treated with an aqueous colloidal activator based on titanium phosphate, and to the corresponding activator. Background technique [0003] Phosphating is a pretreatment method that has been used for decades on metal surfaces for short-term or permanent corrosion protection and often also to improve the adhesion of subsequent primer or paint layers. The zinc-containing phosphating methods known as film-forming phosphating methods (ie they form a clearly visible crystalline layer) have outstanding qualities and have hitherto only been replaced to a limited extent by pretreatment methods with equivalent coating properties. In particular, zinc-nickel phosphates or zinc...

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Application Information

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IPC IPC(8): C23C22/80
CPCC23C22/80Y10T428/2958Y10T442/10B05D3/102
Inventor T.科尔贝格尔E.舍恩费尔德O.达伦堡M.瓦尔特
Owner CHEMETALLGMBH
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