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Normal-temperature rapid phosphating solution and preparing method thereof

A phosphating solution, fast technology, applied in the field of phosphating solution, can solve the problems of carcinogenicity, environmental pollution, violent explosive reaction, etc., and achieve the effects of improving production efficiency, short phosphating time, and low use temperature

Active Publication Date: 2014-03-26
HUNAN JINYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent has the following disadvantages: (1) When preparing the low-temperature one-component zinc-based phosphating solution, the nitric acid added produces a large amount of yellow toxic and harmful smoke, which greatly endangers the health of production personnel
At the same time, nitric acid is highly corrosive, which increases the risk factor of production personnel
(2) Sodium chlorate in this patented formula is a strong oxidizing substance, while hydroxylamine sulfate is a strong reducing substance, and the two will produce violent explosive reactions
The disadvantage is that the molybdate ions and chromate ions in the system are heavy metal ions, which seriously pollute the environment and have been banned by the state. People who have been in contact with them for a long time may even have the risk of carcinogenesis

Method used

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  • Normal-temperature rapid phosphating solution and preparing method thereof
  • Normal-temperature rapid phosphating solution and preparing method thereof

Examples

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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, water 520 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 50% of 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, stir we...

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-nitrobenzenesulfonate 15Kg, sodium citrate 5Kg, water 530Kg.

[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 80Kg, zinc nitrate 210Kg, sodium m-nitrobenzenesulfonate 20Kg, sodium citrate 10Kg, water 510Kg.

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

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Abstract

The invention provides a normal-temperature rapid phosphating solution and a preparing method thereof. The normal-temperature rapid phosphating solution comprises the following raw materials in percentage by mass: 10-20 percent of phosphoric acid, 6-10 percent of zinc oxide, 20-25 percent of zinc nitrate, 1-5 percent of sodium 3-nitrobenzene sulfonate, 0.5-2 percent of sodium citrate and water in balancing amount. A coating which is phosphated by the normal-temperature rapid phosphating solution can last 45 seconds in a copper sulfate drip test and can last 4 hours in a neutral salt mist test, and the adhesive force of a paint coating reaches 0 grade. Meanwhile, the normal-temperature rapid phosphating solution has the characteristics of short phosphating time and low use temperature. The production efficiency is increased, and a large quantity of energy is saved.

Description

technical field [0001] The invention relates to the technical field of phosphating solution, in particular to a normal-temperature fast 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 CN 102703889A discloses a low-temperature one-component zinc-based phosphating solution and its preparation method. The components and their contents in the low-temperature one-component zinc-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 桂成方
Owner HUNAN JINYU CHEM
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