Four-in-one phosphating solution and preparation method thereof

A phosphating solution and phosphoric acid technology, which is applied in the coating process of metal materials, etc., can solve the problems of large corrosion of workpieces, harsh working conditions, poor corrosion resistance of too thin film layers, etc., and achieve improved phosphating efficiency and complete lattice arrangement , The effect of excellent paint adhesion

Inactive Publication Date: 2019-02-19
山东泷瑞源电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the phosphating solution products on the market have the following disadvantages: the general phosphating solution only has a single phosphating function, and the workpiece needs to be derusted and degreased before the phosphating operation.
In addition, the process of phosphating operation is cumbersome, and the phosphating solution needs to be washed with water after treatment, and the sewage generated is discharged outside, causing environmental pollution
However, the existing phosphating process has insurmountable disadvantages in the actual use process. The process takes a long time, has a lot of slag, and consumes a lot of energy. At the same time, a large amount of acid mist is generated during work, which pollutes the environment. If the layer is too thin, the corrosion resistance is poor, and the phosphating film is more serious to hang ash, and some free acidity is high, which will corrode the workpiece greatly, the film layer is rough and porous, and even does not form a film

Method used

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  • Four-in-one phosphating solution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 A four-in-one phosphating solution is composed of the following components: 85% phosphoric acid 10g / L, sodium dihydrogen phosphate 30g / L, sodium tripolyphosphate 0.5g / L, antirust agent 0.1g / L L, stabilizer 0.33 g / L, ammonium molybdate 0.8 g / L, pH regulator 1 g / L, water 1 L.

[0028] The preparation method of above-mentioned a kind of four-in-one phosphating solution, the steps are as follows:

[0029] (1) Weigh the required raw materials according to the formula ratio;

[0030] (2) First add 550mL of water to the reaction kettle, then add 85% phosphoric acid and sodium dihydrogen phosphate to the stainless steel reaction kettle in turn, slowly raise the temperature to 46°C, then add ammonium molybdate while stirring, and wait until the ammonium molybdate After the addition, continue to stir for 12 minutes, then raise the temperature to 70°C, add sodium tripolyphosphate, and stir thoroughly to obtain the base liquid;

[0031] (3) Add the remaining water to th...

Embodiment 2

[0032] Example 2 A four-in-one phosphating solution is composed of the following components: 85% phosphoric acid 30g / L, sodium dihydrogen phosphate 40g / L, sodium tripolyphosphate 1g / L, antirust agent 0.3g / L , 0.46 g / L stabilizer, 1.2 g / L ammonium molybdate, 2 g / L pH regulator, 1 L water.

[0033] The preparation method of above-mentioned a kind of four-in-one phosphating solution, the steps are as follows:

[0034] (1) Weigh the required raw materials according to the formula ratio;

[0035] (2) First add 650mL of water to the reaction kettle, then add 85% phosphoric acid and sodium dihydrogen phosphate to the stainless steel reaction kettle in turn, slowly raise the temperature to 52°C, then add ammonium molybdate while stirring, and wait until the ammonium molybdate After the addition, continue to stir for 20 minutes, then raise the temperature to 78°C, add sodium tripolyphosphate, and stir thoroughly to obtain the base liquid;

[0036] (3) Add the remaining water to the b...

Embodiment 3

[0038] Example 3 A four-in-one phosphating solution is composed of the following components: 85% phosphoric acid 13g / L, sodium dihydrogen phosphate 33g / L, sodium tripolyphosphate 0.62g / L, antirust agent 0.17g / L L, stabilizer 0.36g / L, ammonium molybdate 0.93g / L, pH regulator 1.2g / L, water 1L.

[0039] The preparation method of above-mentioned a kind of four-in-one phosphating solution, the steps are as follows:

[0040] (1) Weigh the required raw materials according to the formula ratio;

[0041] (2) First add 600mL of water to the reaction kettle, then add 85% phosphoric acid and sodium dihydrogen phosphate to the stainless steel reaction kettle in turn, slowly raise the temperature to 48°C, then add ammonium molybdate while stirring, and wait until the ammonium molybdate After the addition, continue to stir for 15 minutes, then raise the temperature to 73°C, add sodium tripolyphosphate, and stir thoroughly to obtain the base liquid;

[0042] (3) Add the remaining water to the...

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Abstract

The invention discloses a four-in-one phosphating solution and a preparation method thereof. The four-in-one phosphating solution is composed of the following components including, by concentration, 10-30g/L of 85% phosphoric acid, 30-40 g/L of sodium dihydrogen phosphate, 0.5-1g/L of sodium tripolyphosphate, 0.1-0.3 g/L of a rust inhibitor, 0.33-0.46 g/L of a stabilizer, 0.8-1.2 g/L of ammonium molybdate, 1-2g/ L of a pH conditioning agent and 1L of water. The four-in-one phosphating solution provided by the invention can be used for achieving four functions including deoiling, derusting, phosphorization and passivation in a tank under the room temperature, uniform, compact and corrosion-resistant color phosphating film is formed on the surface of a steel workpiece and can serve as a bottom layer before coating of paint spraying, powder coating and the like, and the coating adhesion is good.

Description

technical field [0001] The invention relates to the technical field of surface treatment of materials such as metals, in particular to a four-in-one phosphating solution and a preparation method thereof. Background technique [0002] Phosphating is a commonly used pretreatment technology. The metal surface is in contact with dilute phosphoric acid or acidic phosphate, a chemical reaction occurs, and a stable insoluble phosphate protective film is formed on the metal surface. The formed protective film is a phosphating film. Phosphating The film can increase the adhesion of the coating film and improve the corrosion resistance of the coating. Phosphating solution is mainly used for pre-processing and storage of electroplating, paint or workpieces. It is used as the bottom layer of paint to enhance the bonding force between the coating film (such as paint, paint, etc.) and the workpiece, and improve the surface coating of the workpiece after painting. The corrosion resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42C23G1/02
CPCC23C22/42C23G1/02
Inventor 刘来敏
Owner 山东泷瑞源电气科技有限公司
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