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Rust-removing method

A rust remover and iron and steel technology, applied in the field of rust removal treatment and rust removal, can solve the problems of pretreatment that cannot be electroplated, difficulties in pickling operators, and excessive acid mist, so as to achieve the effect of reducing the generation of acid mist

Inactive Publication Date: 2014-07-02
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three environmental pollution problems in hydrochloric acid pickling of steel parts: more acid mist, a large amount of acid rinse water and waste acid with a concentration of more than 7% are produced, which not only causes certain pollution to the environment, but also because of the harsh environment of the pickling workshop, In recent years, it has become extremely difficult to employ workers for pickling operations. Therefore, effective methods must be adopted to deal with acid mist, waste acid and rinse water
Chinese patent CN1054102 also discloses a rust remover formula with low acid concentration: FeCl 3 8-40%, NaCl1-3%, urotropine 0.1-0.3%, alkylbenzenesulfonic acid 0.01-0.1%, hydrochloric acid 2-5%. There must be strong washing with water to remove the rust layer loosened by pickling, resulting in a large amount of rinse water
Although this process eliminates rinsing water, the problem of acid mist and waste acid generated when steel parts are raised has not been solved, and the treatment of flux cannot quickly and completely remove iron ions, and there will still be some iron ions in the intermittent period of treatment Accumulated in the flux and brought into the molten zinc to form slag, which affects the comprehensive benefits of the hot-dip galvanizing process
And this method can only be used for pre-treatment of hot-dip plating, but not for pre-treatment of electroplating
[0006] To sum up, at present, for the pre-treatment rust removal of steel parts electroplating and hot-dip plating process, either there is acid mist, or a large amount of rinsing water is required, or if there is no rinsing water discharged, the subsequent process will be affected, and the waste acid cannot be processed online. And other issues

Method used

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Effect test

Embodiment 1

[0057] Embodiment 1: be used for the pre-treatment derusting of hot-dip galvanizing process of steel parts

[0058] Add the components of rust remover in proportion to the rust remover, turn on the circulating pump to circulate the rust remover solution between the rust remover and the oxidation reactor, and dip the Φ140×1800 Q235 steel pipe into the remover with pickling hanger. In the rust tank, after soaking for a certain period of time, put it into the dilute hydrochloric acid in the acid cleaning tank, after a short soak, put it into the clean water in the rinsing tank, complete the rust removal process after a short water rinse, and then immerse it in the flux tank. The temperature of the rust removal process: normal temperature; the rust removal time: 20 minutes.

[0059] The clear water in the rinsing water tank is controlled with ammonia water to have a pH value of 4 to 5, and is continuously filtered. NH produced by the neutralization reaction 4 Cl is brought into ...

Embodiment 2

[0062] Embodiment 2: be used for the pre-treatment derusting of hot-dip aluminum process of steel parts

[0063] Add the rust remover components in proportion to the rust remover, turn on the circulation pump, and circulate the rust remover solution between the rust remover and the oxidation reactor, and dip the Φ25×6000 Q235 steel pipe into the remover with a pickling hanger. In the rust tank, after soaking for a certain period of time, put it into the dilute hydrochloric acid in the acid cleaning tank, after a short soak, put it into the clean water in the rinsing tank, complete the rust removal process after a short water rinse, and then immerse it in the flux tank. The temperature of the rust removal process: normal temperature; the rust removal time: 30 minutes.

[0064] Use 10% potassium carbonate or potassium hydroxide solution to adjust the pH value=5~6 in the clear water in the rinsing water tank, and filter continuously. The KCl produced by the neutralization reacti...

Embodiment 3

[0067] Embodiment 3: be used for the pretreatment derusting of potassium salt electrogalvanizing of steel parts

[0068] Add the components of the rust remover in proportion to the rust remover, turn on the circulation pump, and circulate the rust remover solution between the rust remover and the oxidation reactor. The 60×6000 Q235 angle steel is dipped into the derusting tank with a pickling spreader. After soaking for a certain period of time, it is proposed to be immersed in the dilute hydrochloric acid in the acid cleaning tank. Rust removal process, and then immersed in the flux bath. The temperature of the rust removal process: normal temperature; the rust removal time: 60 minutes.

[0069] The clear water in the rinsing water tank is automatically controlled with 10% potassium carbonate or potassium hydroxide solution to have a pH value of 5 to 6, and is continuously filtered. The KCl produced by the neutralization reaction is brought into the electroplating solution,...

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Abstract

The invention relates to a rust-removing method, which is characterized in that a rust-removing device, comprising a rust-removing channel, a rinsing water channel and an acid rinsing channel for connecting the rust-removing channel and the rinsing water channel, wherein the rust-removing channel is connected with an oxidation reactor, the rinsing water channel is connected with a PH value monitoring control device and a filter device capable of realizing real-time circulating, and the oxidation reactor is provided with an oxygen or air inlet; a rust-removing agent is filled in the rust-removing channel, wherein the rust-removing agent comprises the following components: technical hydrochloric acid, an oxidizing agent, an accelerator, a stripping agent, a corrosion inhibitor, a degreaser, a stabilizer and water; the rust-removing method comprises the following steps of a, starting a circulating pump to enable the rust-removing agent to circulate between the rust-removing groove and the oxidization reactor, and immersing a steel piece in the rust-removing channel; b, immersing the steel piece in diluted hydrochloric acid again; c, immersing the steel piece in the rinsing water channel; and controlling the PH value of the clear water in the rinsing water channel at 3-7 to precipitate Fe<3+>, and then filtering through the filter device. According to the rust-removing method, acid mist and rinsing water cannot be produced in the rust removing process.

Description

technical field [0001] The invention relates to a derusting treatment method for steel parts before applying a metal coating process in the technical field of metal surface anticorrosion treatment, in particular to a derusting method. Background technique [0002] Iron and steel materials are engineering structural materials with the best comprehensive performance in human society, but they are easy to corrode and rust, so surface treatment is necessary for anticorrosion. The first step in surface preparation is to remove the oxide layer or rust layer on the steel surface. The method of removing the rust layer is generally divided into mechanical method and chemical method. The mechanical method can only be used for workpieces with relatively simple shapes due to the limitation of the shape of the steel parts to be processed. Therefore, chemical methods are commonly used in industrial production, that is, various acid to remove rust. Different acids have different prices, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G1/06
Inventor 李国喜王自东
Owner NORTHEASTERN UNIV LIAONING