CN109504975B

CN109504975B - Rust remover replacing hydrochloric acid for rust removal

Info

Publication number: CN109504975B
Application number: CN201910036380.7A
Authority: CN
Inventors: 王薇
Original assignee: Individual
Current assignee: Zhuji Huarui Chemical Fiber Factory
Priority date: 2016-10-13
Filing date: 2016-10-13
Publication date: 2020-12-11
Anticipated expiration: 2036-10-13
Also published as: CN106400036A; CN106400036B; CN109504975A

Abstract

The invention provides a rust remover for replacing hydrochloric acid for rust removal, wherein the rust remover for rust removal is prepared from the following raw materials in parts by weight: 20-30 parts of composite organic acid, 5-10 parts of polymethacrylic acid, 6-12 parts of chromic anhydride, 10-20 parts of surfactant, 3-6 parts of sodium gluconate and 1-3 parts of triethanolamine,1-3 parts of polyacrylamide, 1-2 parts of 1, 4-butynediol, 0.01-0.1 part of sodium chloride, 0.5-2 parts of a functional assistant and 70-90 parts of water; the pH value of the rust remover is about 6.0, and the density of the rust remover is 0.9-1.2 g/cm³(ii) a The rust remover does not use hydrochloric acid, namely, the generation of acid mist is reduced from the source, and substances harmful to human bodies are not used in the rust remover, so that the rust remover does not pollute the environment and is an environment-friendly rust remover; the rust remover has excellent rust removing performance, very short rust removing time and very high rust removing rate, effectively recovers the surface gloss of the metal matrix and has very good application prospect.

Description

Rust remover replacing hydrochloric acid for rust removal

The invention relates to a split application, the original application number is 201610893288.9, the application date is 2016, 10 and 13, and the name of the invention is 'an environment-friendly process for replacing hydrochloric acid for rust removal'.

Technical Field

The invention belongs to the technical field of metal rust removal and prevention, and particularly relates to a rust remover for replacing hydrochloric acid for rust removal.

Background

The rust removal treatment is a basic process before the surface of steel is coated. The rust removing method can be roughly divided into two main types of mechanical method and chemical method, which have the characteristics and are suitable for different occasions. Among them, the chemical method has a series of advantages of good effect, high efficiency, simple process operation, low cost, etc., so it has been widely used in industry. A common way in chemical descaling is to clean the steel surface with a descaling liquid, such as an acid. Different acids have different prices, and sulfuric acid and hydrochloric acid with lower prices are commonly used. Sulfuric acid is dangerous, washing after acid washing is not easy to clean, and residual acid is easy to influence the subsequent process of surface treatment, so hydrochloric acid is more used in actual production.

The technological process of rust removal with hydrochloric acid for surface treatment of steel parts includes soaking steel parts in pickling tank with 15-20% hydrochloric acid solution at normal temperature for 30 min-2 hr, and rinsing with flowing water in water washing tank to complete the pre-treatment of rust removal. However, the hydrochloric acid pickling of the steel parts has three environmental pollution problems: more acid mist, a large amount of acid rinsing water and waste acid with the concentration of more than 7 percent are generated, so that not only is certain pollution caused to the environment, but also because the environment of a pickling workshop is severe, the employment of pickling operators becomes extremely difficult in recent years, and therefore, a plurality of methods are invented for solving the problem of environmental pollution caused by hydrochloric acid rust removal.

There are generally three main methods for preventing acid mist: firstly, the acid mist is sucked into the acid mist purification tower through an air suction opening arranged at the edge of the pickling tank to purify the acid mist, secondly, the acid mist inhibitor is covered on the surface of the pickling solution, and thirdly, the concentration of the hydrochloric acid is reduced to be below 10 percent. Acid mist purification towers and acid mist inhibitors are known in the prior art, and although patent technology is disclosed continuously, for example, CN034589, CN1010419, CN1O1210330, CN1O2443813, CN1O1864624, CN1O1810352 and CN1O2260875 disclose acid mist suppression additives composed of various corrosion inhibitors, surfactants, complexing agents and the like; CN100570007, CN1O1298681 and CN1O1569823 disclose a closed pickling tank, an acid mist recovery device and the like. However, both of these acid mist treatment methods have a problem that the acid mist generated when the steel product is taken out from the pickling tank cannot be solved. Therefore, the most effective solution to acid mist is to reduce the hydrochloric acid concentration to below 10%. Chinese patent CN1039850 discloses a low acid concentration rust remover formula: the acid concentration is 8-12%, and the concentration of iron (III) ions is 15-200g/L, so that in the practical application of the rust remover, because the formula is too simple, the steel matrix is over-corroded, and a loose rust layer can be removed by strong washing, a large amount of rinsing water is generated.

In summary, the prior pretreatment rust removal of steel part electroplating and hot dip plating processes requires a large amount of rinsing water instead of acid mist, and the process for removing rust by hydrochloric acid cannot meet the development requirements of the prior rust removal.

Disclosure of Invention

The invention aims to provide a rust remover for replacing hydrochloric acid for removing rust, which has the advantages of complete rust removal, no damage to a substrate, good solution stability, high efficiency and high speed.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a rust remover replacing hydrochloric acid rust removal is prepared from the following raw materials in parts by weight: 20-30 parts of a composite organic acid, 5-10 parts of polymethacrylic acid, 6-12 parts of chromic anhydride, 10-20 parts of a surfactant, 3-6 parts of sodium gluconate, 1-3 parts of triethanolamine, 1-3 parts of polyacrylamide, 1-2 parts of 1, 4-butynediol, 0.01-0.1 part of sodium chloride, 0.5-2 parts of a functional assistant and 70-90 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1-2, the pH value of the rust remover is about 6.0, and the density of the rust remover is 0.9-1.2 g/cm³；

The rust removal process comprises the following steps: firstly, adding a rust remover into a rust removing tank, immersing a steel piece to be cleaned into the rust remover, starting microwaves, and performing rust removing treatment under the radiation of the microwaves; and then, the steel piece after the rust removal treatment is lifted out of the rust removal groove and then is immersed into clean water in a rinsing water groove for rinsing, and after rinsing is finished, the steel piece is lifted out of the rinsing water groove to finish rust removal.

The surfactant is a nonionic surfactant and an anionic surfactant, and the mass ratio of the nonionic surfactant to the anionic surfactant is 1: 1, the nonionic surfactant is at least one of nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, coconut oil fatty acid diethanolamide and fatty alcohol polyoxyethylene ether; the anionic surfactant is sodium dodecyl benzene sulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate.

The functional auxiliary agent is one or more of an antifreezing agent, a defoaming agent and a solubilizer thickening agent.

The microwave irradiation adopts a microwave generator 1250 +/-50 MHz, and the irradiation time is 100-200 seconds.

The rinsing water tank is connected with a pH value monitoring and controlling device and a filtering device capable of circulating in real time, and an alkaline substance is filled in the pH value monitoring and controlling device; and the pH value of the clear water in the rinsing water tank is controlled to be about 7 by a pH value monitoring and controlling device.

The alkaline substance comprises ammonia water, ammonium bicarbonate, sodium bicarbonate, potassium bicarbonate, sodium carbonate and potassium carbonate.

The preparation method of the rust remover comprises the following steps: (1) according to the weight parts, 1/2 water is firstly added into a reaction kettle, then the composite organic acid, the polymethacrylic acid, the chromic anhydride, the sodium gluconate, the sodium chloride and the functional auxiliary agent are sequentially added while stirring at the speed of 100 plus 150 revolutions per minute, the temperature is heated to 40-50 ℃, the temperature is kept for 30-60 min, and the mixture is cooled; (2) adding triethanolamine, polyacrylamide and 1, 4-butynediol in parts by weight into the mixture obtained in the step (1), and stirring to fully dissolve the triethanolamine, the polyacrylamide and the 1, 4-butynediol; (3) adding a surfactant into the mixed solution obtained in the step (2), and then adding the remaining 1/2 water; starting a stirring device, stirring for 10 minutes at 30-50 rpm, and standing to obtain the rust remover.

The invention has the technical effects that: (1) the rust remover disclosed by the invention does not use hydrochloric acid, namely, the generation of acid mist is reduced from the source, and the rust remover is good in water solubility, high in hydrolysis stability, good in viscosity-temperature performance, high in viscosity index and small in compressibility; the rust remover does not use substances harmful to human bodies, does not pollute the environment, and is an environment-friendly rust remover; (2) the invention adopts the composite organic acid as the main component and is matched with various functional components, and the prepared rust remover has excellent rust removing performance; the polymethacrylic acid can play a role in destroying the internal matrix structure of the iron rust, so that the contact surface of the iron rust and a rust remover can be increased, the rust removing speed is accelerated, the rust removal is more thorough, and the corrosion of the solution to the metal surface can be effectively reduced by the matched use of the triethanolamine and the polyacrylamide; the rust remover effectively restores the surface gloss of the metal matrix, and avoids the over-corrosion and hydrogen embrittlement; (3) the pH value of the rust remover is about 6.0 and tends to be neutral, so that corrosion of any form to equipment and systems is avoided from the source; (4) the invention adopts a microwave rust removal method, and overcomes the technical defects that the rust remover has overlong rust removal time in a normal state, incomplete rust removal and the like.

Detailed Description

The technical scheme of the invention is further explained by combining the embodiment as follows:

example 1

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 20 parts of composite organic acid, 5 parts of polymethacrylic acid, 6 parts of chromic anhydride, 5 parts of nonylphenol polyoxyethylene ether, 5 parts of sodium dodecyl benzene sulfonate, 3 parts of sodium gluconate, 1 part of triethanolamine, 1 part of polyacrylamide, 1 part of 1, 4-butynediol, 0.01 part of sodium chloride, 0.2 part of defoaming agent, 0.3 part of solubilizer and 70 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.

Example 2

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 30 parts of composite organic acid, 10 parts of polymethacrylic acid, 12 parts of chromic anhydride, 10 parts of octylphenol polyoxyethylene ether, 10 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 6 parts of sodium gluconate, 3 parts of triethanolamine, 3 parts of polyacrylamide, 2 parts of 1, 4-butynediol, 0.1 part of sodium chloride, 0.3 part of an antifreezing agent, 0.3 part of a defoaming agent and 90 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 2.

Example 3

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 25 parts of composite organic acid, 8 parts of polymethacrylic acid, 9 parts of chromic anhydride, 10 parts of fatty alcohol-polyoxyethylene ether, 5 parts of sodium dodecyl benzene sulfonate, 5 parts of sodium gluconate, 2 parts of triethanolamine, 2 parts of polyacrylamide, 1.5 parts of 1, 4-butynediol, 0.06 part of sodium chloride, 0.4 part of solubilizer, 0.4 part of thickener and 80 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.5.

Example 4

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 28 parts of composite organic acid, 7 parts of polymethacrylic acid, 10 parts of chromic anhydride, 10 parts of coconut oil fatty acid diethanolamide, 6 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 5 parts of sodium gluconate, 3 parts of triethanolamine, 2 parts of polyacrylamide, 1.2 parts of 1, 4-butynediol, 0.04 part of sodium chloride, 1.2 parts of functional additive and 82 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.2.

Example 5

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 24 parts of composite organic acid, 7 parts of polymethacrylic acid, 8 parts of chromic anhydride, 5 parts of octylphenol polyoxyethylene ether, 7 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 4 parts of sodium gluconate, 1.3 parts of triethanolamine, 1.4 parts of polyacrylamide, 1.2 parts of 1, 4-butynediol, 0.06 part of sodium chloride, 0.6 part of defoaming agent, 0.4 part of thickening agent and 78 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.6.

Example 6

An environment-friendly process for replacing hydrochloric acid for rust removal, wherein a rust remover for rust removal is prepared from the following raw materials in parts by weight: 26 parts of composite organic acid, 9 parts of polymethacrylic acid, 11 parts of chromic anhydride, 6 parts of nonylphenol polyoxyethylene ether, 8 parts of sodium dodecyl benzene sulfonate, 5 parts of sodium gluconate, 2 parts of triethanolamine, 2 parts of polyacrylamide, 2 parts of 1, 4-butynediol, 0.07 part of sodium chloride, 0.5 part of an antifreezing agent, 0.5 part of a solubilizer and 84 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.8.

Example 7

The rust remover of examples 1-6 is prepared by the following steps: (1) according to the weight parts, 1/2 water is firstly added into a reaction kettle, then the composite organic acid, the polymethacrylic acid, the chromic anhydride, the sodium gluconate, the sodium chloride and the functional auxiliary agent are sequentially added while stirring at the speed of 120 r/min, the temperature is heated to 45 ℃, the temperature is kept for 45min, and the mixture is cooled; (2) adding triethanolamine, polyacrylamide and 1, 4-butynediol in parts by weight into the mixture obtained in the step (1), and stirring to fully dissolve the triethanolamine, the polyacrylamide and the 1, 4-butynediol; (3) adding a surfactant into the mixed solution obtained in the step (2), and then adding the remaining 1/2 water; and starting a stirring device, stirring for 10 minutes at 40 rpm, and standing to obtain the rust remover.

Example 8

The performance test experiments were carried out on the rust removers of examples 1 to 6, and the test process was: firstly, adding a rust remover into a rust removing tank, immersing a steel piece to be cleaned into the rust remover, starting microwaves, and performing rust removing treatment under the radiation of the microwaves; and then, the steel piece after the rust removal treatment is lifted out of the rust removal groove and then is immersed into clean water in a rinsing water groove for rinsing, and after rinsing is finished, the steel piece is lifted out of the rinsing water groove to finish rust removal. The microwave irradiation adopts a microwave generator 1250MHz, and the irradiation time is 150 seconds.

The test results are shown in the following table 1:

	rust removal rate (%)	Rust removal time(s)	Influence on the surface of steel parts
				Example 1	96.3	185	Smooth surface without influence
Example 2	97.2	190	Smooth surface without influence
				Example 3	95.5	180	Smooth surface without influence
Example 4	96.8	195	Smooth surface without influence
				Example 5	94.7	200	Smooth surface without influence
Example 6	95.3	175	Smooth surface without influence

As can be seen from Table 1, the rust remover prepared by the invention has the advantages of excellent rust removing performance, very short rust removing time, very high rust removing rate, effective recovery of the surface gloss of the metal matrix and very good application prospect.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rust remover for replacing hydrochloric acid for removing rust is characterized by being prepared from the following raw materials in parts by weight: 25 parts of composite organic acid, 8 parts of polymethacrylic acid, 9 parts of chromic anhydride, 15 parts of surfactant, 5 parts of sodium gluconate, 2 parts of triethanolamine, 2 parts of polyacrylamide, 1.5 parts of 1, 4-butynediol, 0.06 part of sodium chloride, 0.5-2 parts of functional additive and 80 parts of water; wherein the composite organic acid is naphthenic acid and tartaric acid according to a weight ratio of 1: 1.5, wherein the pH value of the rust remover is about 6.0;

the preparation method of the rust remover comprises the following steps: (1) according to the weight parts, 1/2 water is firstly added into a reaction kettle, then the composite organic acid, the polymethacrylic acid, the chromic anhydride, the sodium gluconate, the sodium chloride and the functional auxiliary agent are sequentially added while stirring at the speed of 120 r/min, the temperature is heated to 40-50 ℃, the temperature is kept for 45min, and the mixture is cooled; (2) adding triethanolamine, polyacrylamide and 1, 4-butynediol in parts by weight into the mixture obtained in the step (1), and stirring to fully dissolve the triethanolamine, the polyacrylamide and the 1, 4-butynediol; (3) adding a surfactant into the mixed solution obtained in the step (2), and then adding the remaining 1/2 water; starting a stirring device, stirring for 10 minutes at 40 revolutions per minute, and standing to obtain the rust remover; the surfactant is formed by compounding a nonionic surfactant and an anionic surfactant, wherein the nonionic surfactant is fatty alcohol-polyoxyethylene ether, and the dosage of the nonionic surfactant is 10 parts; the anionic surfactant is sodium dodecyl benzene sulfonate, and the dosage of the anionic surfactant is 5 parts; the functional auxiliary agent comprises 0.4 part of solubilizer and 0.4 part of thickening agent.