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Normal temperature slag-free rapid phosphating solution and preparation method thereof

A phosphating solution and fast technology, applied in the field of phosphating solution, can solve the problems of long phosphating time, difficulty in phosphating coating, low free acidity, etc., achieve short phosphating time, low use temperature, and prolong cleaning cycle Effect

Active Publication Date: 2016-08-24
HUNAN JINYU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patented phosphating solution produces very little sediment during use, its free acidity is extremely low, resulting in difficulties in phosphating the film and long phosphating time.

Method used

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  • Normal temperature slag-free rapid phosphating solution and preparation method thereof
  • Normal temperature slag-free rapid phosphating solution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Every 1000Kg room temperature rapid phosphating solution is made of the following raw materials:

[0045] Phosphoric acid 150Kg, zinc oxide 90 Kg, zinc nitrate 220 Kg, sodium m-nitrobenzene sulfonate 10 Kg, sodium citrate 10 Kg, EDTA 10 Kg, water 510 Kg.

[0046] Its preparation method comprises the following steps in turn:

[0047] (1) Add phosphoric acid into the reactor, open the reactor and stir;

[0048] (2) Add 50% of the total amount of water required into the reactor;

[0049](3) Add zinc oxide into the reaction kettle until the reaction is complete and the solution is clear (about 4 hours);

[0050] (4) Add the remaining water to the reactor;

[0051] (5) Add zinc nitrate to the reaction kettle, stir well and the solution is clear (about 2 hours);

[0052] (6) Add sodium m-nitrobenzenesulfonate into the reaction kettle, wait until it is evenly stirred and the solution is clarified (about 1 hour);

[0053] (7) Add sodium citrate into the reaction kettle, st...

Embodiment 2

[0056] Every 1000Kg room temperature rapid phosphating solution is made of the following raw materials:

[0057] Phosphoric acid 180Kg, zinc oxide 70Kg, zinc nitrate 200Kg, sodium m-nitrobenzene sulfonate 15Kg, sodium citrate 5Kg, EDTA 20 Kg, water 510Kg.

[0058] The preparation method is the same as in Example 1.

Embodiment 3

[0060] Every 1000Kg room temperature rapid phosphating solution is made of the following raw materials:

[0061] Phosphoric acid 170Kg, zinc oxide 80 Kg, zinc nitrate 210 Kg, sodium m-nitrobenzene sulfonate 20 Kg, sodium citrate 10 Kg, EDTA 10 Kg, water 500 Kg.

[0062] The preparation method is the same as in Example 1.

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Abstract

The invention provides a normal-temperature sludgeless fast phosphating liquid and a preparation method thereof. The normal-temperature sludgeless fast phosphating liquid is prepared from the following raw materials by mass percent: 10-20% of phosphoric acid, 6-10% of zinc oxide, 20-25% of zinc nitrate, 1-5% of sodium metanitrobenzene sulfonate, 0.5-2% of sodium citrate, 1-4% of ethylenediamine tetraacetic acid (EDTA), and the balance of water. The phosphating film copper sulfate droplet test time of the phosphating liquid disclosed by the invention can be up to 30 seconds, the neutral salt spray test time can be up to 4 hours, the adhesive force of a paint film can be up to 0 grade, meanwhile, the phosphating time is short, the work efficiency is greatly improved, the operating temperature is low, a phosphating sediment is basically not generated, the cleaning cycle is greatly prolonged, the solid waste treatment cost is reduced, and energy consumption does not need to be consumed.

Description

technical field [0001] The invention relates to the technical field of phosphating solution, in particular to a normal temperature slag-free rapid phosphating solution and a preparation method thereof. Background technique [0002] With the rapid development of the metal processing industry, the phosphating process is widely used in metal surface treatment, especially in the pre-treatment of painting (or spray painting). Most of the phosphating solutions currently used are medium and high temperature phosphating solutions (use temperature 55°C-95°C). Unfavorable factors such as large investment in chemical equipment, high energy consumption, large acid mist, poor solution stability, many sediments, cumbersome adjustments, and high pressure on environmental protection. [0003] Chinese patent CN102605364 discloses a medium-temperature, low-sludge, low-emission thick-film phosphating solution and its phosphating method. The components of the phosphating solution are: 3-5% of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 桂成方
Owner HUNAN JINYU ENVIRONMENTAL PROTECTION TECH CO LTD
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