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Galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet dipping and phosphating method in the same tank

A technology of galvanized steel sheet and cold-rolled steel sheet is applied in the field of dipping and phosphating of galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet in the same groove, which can solve the problems of inability to meet the coating requirements and achieve good alkali resistance. Effect

Active Publication Date: 2017-06-20
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the subsequent phosphating process, due to the huge difference in composition and surface condition between the hot-dip coated steel sheet and the cold-rolled steel sheet, it is difficult for the ordinary phosphating process to ensure a good phosphating film for the two materials at the same time. Therefore, it cannot meet the requirements of subsequent coating

Method used

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  • Galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet dipping and phosphating method in the same tank
  • Galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet dipping and phosphating method in the same tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Configure the basic solution, dissolve the basic solution in water at 50°C, and keep stirring; after stirring evenly, dissolve the additives in it according to the proportion under the condition of constant stirring to obtain the phosphating solution; measure the phosphating during the process of adding the additive The free acidity, total acidity and oxidant concentration of the liquid, and adjusted to free acidity 1.0, total acidity 28, and oxidant concentration 4.0g / L according to the measured values; hot-dip galvanized steel sheets and alloys with no oil on the surface and no other dirt and impurities Hot-dip galvanized steel sheet and cold-rolled steel sheet;

[0026] Then dip the galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet in the prepared phosphating solution for 2 minutes, take it out, wash it with water, and enter the electrophoretic coating tank.

[0027] test:

[0028] 1. Phosphating film diameter

[0029] Observation w...

Embodiment 2

[0036] Configure the basic solution, dissolve the basic solution in water at 50°C, and keep stirring; after stirring evenly, dissolve the additives in it according to the proportion under the condition of constant stirring to obtain the phosphating solution; measure the phosphating during the process of adding the additive The free acidity, total acidity and oxidant concentration of the solution, and adjusted to free acidity 0.5, total acidity 30, and oxidant concentration 3.8g / L according to the measured values; hot-dip galvanized steel sheets and alloys with no oil on the surface and no other dirt and impurities Hot-dip galvanized steel sheet and cold-rolled steel sheet;

[0037] Then dip the galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet in the prepared phosphating solution for 3 minutes, take it out, wash it with water, and enter the electrophoretic coating tank.

[0038] test:

[0039] 1. The diameter test of the phosphating film is th...

Embodiment 3

[0044] Configure the basic solution, dissolve the basic solution in water at 30°C, and keep stirring; after stirring evenly, dissolve the additives in it according to the proportion under the condition of constant stirring to obtain the phosphating solution; measure the phosphating during the process of adding the additive The free acidity, total acidity and oxidant concentration of the liquid, and adjusted to free acidity 1.2, total acidity 30, and oxidant concentration 3.7g / L according to the measured values; hot-dip galvanized steel sheets and alloys with no oil on the surface and no other dirt and impurities Hot-dip galvanized steel sheet and cold-rolled steel sheet;

[0045] Then dip the galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet in the prepared phosphating solution for 4 minutes, take it out, wash it with water, and enter the electrophoretic coating tank.

[0046] test:

[0047] 1. The diameter test of the phosphating film is the ...

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Abstract

The invention discloses a dipping and phosphating method for galvanized steel sheets, alloyed galvanized steel sheets and cold-rolled steel sheets in the same tank. The specific operation process is as follows: configure a basic solution, dissolve the basic solution in water at 30-60°C, and keep stirring; After stirring evenly, the additives are dissolved in the phosphating solution according to the proportion in the case of constant stirring; the free acidity, total acidity and oxidant concentration of the phosphating solution are measured during the process of adding the additives, and the free acidity, total acidity and oxidant concentration are measured according to the measured values. Adjust the total acidity and oxidant concentration to the set value; then immerse the galvanized steel sheet, alloyed galvanized steel sheet and cold-rolled steel sheet in the prepared phosphating solution for 1 to 5 minutes, take it out, wash it with water, and enter the electrophoretic coating tank ;Through the configuration of multi-component composite phosphating solution and a reasonable application process, a uniform phosphating film is formed on the surface of the steel plate, and the thickness of the phosphating film meets the requirements, with a diameter of ≤10 microns and good alkali resistance, which can meet the requirements of subsequent electrophoresis Coating index requirements.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a dipping and phosphating method for galvanized steel sheets, alloyed galvanized steel sheets and cold-rolled steel sheets in the same tank. Background technique [0002] In the field of automobile manufacturing, hot-dip galvanized steel sheets (hot-dip galvanized, alloyed hot-dip galvanized) are usually combined with cold-rolled steel sheets to ensure the corrosion resistance of special parts. However, in the subsequent phosphating process, due to the huge difference in composition and surface condition between the hot-dip coated steel sheet and the cold-rolled steel sheet, it is difficult for the ordinary phosphating process to ensure a good phosphating film for the two materials at the same time. As a result, the subsequent coating requirements cannot be met. Contents of the invention [0003] The purpose of the present invention is to overcome the deficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/73C23C22/36
Inventor 柴立涛赵云龙章书周李进王占业
Owner MAGANG (GROUP) HOLDING CO LTD