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Preparation method of surface phosphating liquid for galvanized steel plates

A surface phosphating and preparation method technology, which is applied in the direction of metal material coating technology, can solve the problems of hexavalent chromium hazards, chromate use restrictions, etc., and achieve the effects of improved corrosion resistance, rapid formation, and good matching

Inactive Publication Date: 2014-12-31
WUXI LUOSHE TECH VENTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toxicity of hexavalent chromium has serious harm to the environment and human body, and the use of chromate has been strictly restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of preparation method of the surface phosphating solution of galvanized steel plate, the composition of this phosphating solution is: calcium dihydrogen phosphate 62g / L, manganese dihydrogen phosphate 16g / L, manganese nitrate 8g / L, zinc dihydrogen phosphate 42g / L L, zinc nitrate 13g / L, citric acid 14g / L, sodium dodecylbenzenesulfonate 5g / L, sodium fluoroborate 5g / L, and the balance is water; the preparation method is: take half of the total amount of water , first add citric acid and sodium dodecylbenzenesulfonate, stir until they dissolve, then add calcium dihydrogen phosphate, manganese dihydrogen phosphate and zinc dihydrogen phosphate in turn, and then add manganese nitrate and zinc nitrate in turn after they dissolve And sodium fluoroborate, after the former component is completely dissolved, add the next substance, and finally add the remaining water, and adjust the pH value to 3-5 with acetic acid.

Embodiment 2

[0014] A kind of preparation method of the surface phosphating solution of galvanized steel plate, the composition of this phosphating solution is: calcium dihydrogen phosphate 66g / L, manganese dihydrogen phosphate 12g / L, manganese nitrate 12g / L, zinc dihydrogen phosphate 38g / L L, zinc nitrate 17g / L, citric acid 12g / L, sodium dodecylbenzenesulfonate 7g / L, sodium fluoroborate 3g / L, and the balance is water; the preparation method is: take half of the total amount of water , first add citric acid and sodium dodecylbenzenesulfonate, stir until they dissolve, then add calcium dihydrogen phosphate, manganese dihydrogen phosphate and zinc dihydrogen phosphate in turn, and then add manganese nitrate and zinc nitrate in turn after they dissolve And sodium fluoroborate, after the former component is completely dissolved, add the next substance, and finally add the remaining water, and adjust the pH value to 3-5 with acetic acid.

Embodiment 3

[0016] A kind of preparation method of the surface phosphating solution of galvanized steel plate, the composition of this phosphating solution is: calcium dihydrogen phosphate 63g / L, manganese dihydrogen phosphate 15g / L, manganese nitrate 9g / L, zinc dihydrogen phosphate 41g / L L, zinc nitrate 14g / L, citric acid 13.5g / L, sodium dodecylbenzenesulfonate 5.5g / L, sodium fluoroborate 4.5g / L, and the balance is water; the preparation method is: take the total amount Half of the water, first add citric acid and sodium dodecylbenzene sulfonate, stir until they are dissolved, then add calcium dihydrogen phosphate, manganese dihydrogen phosphate and zinc dihydrogen phosphate in turn, and then add manganese nitrate in turn after they are dissolved , zinc nitrate and sodium fluoroborate, after the former component is completely dissolved, add the next substance, and finally add the remaining water, and adjust the pH value to 3-5 with acetic acid.

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PUM

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Abstract

The invention discloses a preparation method of a surface phosphating liquid for galvanized steel plates. The phosphating liquid comprises the components: 62-66 g / L of calcium dihydrogen phosphate, 12-16 g / L of manganese dihydrogen phosphate, 8-12 g / L of manganese nitrate, 38-42 g / L of zinc dihydrogen phosphate, 13-17 g / L of zinc nitrate, 12-14 g / L of citric acid, 5-7 g / L of sodium dodecyl benzene sulfonate, 3-5 g / L of sodium fluoborate, and the balance water. The preparation method comprises the step: taking water with the amount half of the total amount of water, firstly adding citric acid and sodium dodecyl benzene sulfonate, stirring until being dissolved, successively adding calcium dihydrogen phosphate, manganese dihydrogen phosphate and zinc dihydrogen phosphate, until being dissolved, successively adding manganese nitrate, zinc nitrate and sodium fluoroborate by a way of adding the next component until the former component is completely dissolved, finally adding the remaining water, and adjusting the pH value to 3-5 with acetic acid.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a method for preparing a surface phosphating solution for galvanized steel sheets. Background technique [0002] With the rapid development of the automobile industry, the demand and requirements for environmentally friendly galvanized sheet surface treatment technology have increased. The potential of zinc is negative than that of iron. In industry, electroplating and hot dipping are often used to deposit zinc on the surface of steel, and the substrate is protected by a sacrificial anode of zinc. Due to the stamping processability, weldability, adhesion to paint film and corrosion resistance before and after deformation of galvanized steel sheets, the service life of steel is greatly extended. Galvanized steel sheets have been widely used in automobiles, home appliances, chemicals, aviation, etc. And other fields, especially electro-galvanized steel sheet has been wid...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 高忠清
Owner WUXI LUOSHE TECH VENTURE