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Method for coating metal surfaces with activators prior to phosphating

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

Active Publication Date: 2020-07-03
CHEMETALLGMBH
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  • Description
  • Claims
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Problems solved by technology

But lower paint adhesion and higher chemical consumption are also related to higher layer weights

Method used

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  • Method for coating metal surfaces with activators prior to phosphating
  • Method for coating metal surfaces with activators prior to phosphating
  • Method for coating metal surfaces with activators 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 present invention relates to a method for coating metal surfaces with an activator prior to phosphating. In particular, the present invention relates to a method for phosphating a metal surface, wherein prior to phosphating, the metal surface is treated with an aqueous colloidal activator based on phosphate and titanium, wherein the activator contains at least one compound having at least one organic group. water-soluble silicon compounds. The invention also relates to corresponding activators.

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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Patent Type & Authority Patents(China)
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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