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Iron and steel product surface treating agent and preparation method thereof

A technology of surface treatment agent and parts, which is applied in the direction of metal material coating process, etc., can solve the problems of phosphating solution destruction of active components, waste of acid solution, time-consuming, etc., to reduce the amount of waste water, shorten the process flow, and reduce production cost effect

Inactive Publication Date: 2016-01-20
NANHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high labor intensity, low efficiency and serious dust pollution of the mechanical method, except for a few cases, most manufacturers use chemical methods for rust removal.
Chemical derusting, the simplest method is to use sulfuric acid to process the rust on the surface of steel parts. There are the following problems in the use of sulfuric acid derusting: the above-mentioned acid solution derusting agent is in the later period of use, and the ferrous iron As the concentration increases, the rust removal speed will become very slow. At this time, even if the acid concentration is increased, the effect will not be great. Under this situation, if you want to completely remove the rust, you have to completely replace the acid solution in the acid tank Therefore, the use of sulfuric acid to remove rust will cause a large amount of acid waste, and the production cost of the enterprise will be higher
[0005] Phosphating solution is required for phosphating treatment. Currently commonly used phosphating solutions (including the above-mentioned commonly used phosphating solutions) usually have some deficiencies during transportation, storage and use. The specific performance is as follows: storage time of phosphating solution Most of them cannot exceed one month, and if the storage time is long, gray sediment will be produced due to oxidation and disproportionation reactions. In this way, the active ingredients in the phosphating solution will be damaged, resulting in a decrease in the phosphating effect, and the final phosphating film will become distorted. get loose
[0006] Nowadays, enterprises adopt the step-by-step treatment method of first derusting, then degreasing, and finally phosphating to comprehensively treat the surface of steel parts. This operation is time-consuming and laborious. At the same time, each process will generate a large amount of industrial wastewater, which is not only environmentally friendly. , and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0017] As an embodiment of the present invention, a surface treatment agent for iron and steel parts, the weight ratio of its components is: 12-17% phosphoric acid with a concentration of 85%, 3-8% composite phosphate, and a concentration of 65%. 7-12% of nitric acid, 5-10% of corrosion inhibitor, 1-3% of water-based surfactant, 3-6% of zinc chrome yellow, 4-7% of polyol ester, and the balance is water;

[0018] The above-mentioned corrosion inhibitor is one of sodium citrate, sodium sulfite, zinc sulfate or a mixture of any two or more;

[0019] The above-mentioned polyol esters are one or a mixture of any two or more of pentaerythritol esters, glycolipids, and neopentyl polyol esters.

[0020] As a preferred embodiment, the weight percentage distribution ratio of the components of the surface treatment agent for iron and steel products is: 15% of phosphoric acid with a concentration of 85%, 5% of composite phosphate, 10% of nitric acid with a concentration of 65%, Corrosion...

Embodiment 1

[0028] Under normal pressure, according to: 12% of phosphoric acid with a concentration of 85%, 3% of compound phosphate, 7% of nitric acid with a concentration of 65%, 10% of sodium sulfite, 3% of water-based surfactant, 6% of zinc chrome yellow, pentaerythritol ester 7%, the balance is the weight ratio of water. Prepare each component, and put the above components in the corresponding container, then take a part of water from the container filled with water and add it to the reactor and put it in the reactor. Heat the water to 50°C, then add phosphoric acid, compound phosphate, sodium sulfite, pentaerythritol ester, water-based surfactant, zinc chrome yellow to the reactor according to the above weight ratio while stirring, and wait until the above components are completely dissolved Cool the obtained solution to normal temperature, then add nitric acid under ventilated conditions, and finally add the remaining water to obtain the surface treatment agent for steel parts of th...

Embodiment 2

[0034] Embodiment 2 is compared with embodiment 1, only the weight proportion of each component changes to some extent, and other content is exactly the same as embodiment 1, does not go into details here, the weight proportion of each component among the present embodiment 2 is : 85% phosphoric acid 17%, compound phosphate 8%, 65% nitric acid 12%, sodium sulfite 5%, water-based surfactant 1%, zinc chrome yellow 3%, pentaerythritol ester 4%, the balance is water.

[0035] Same as Example 1, after the preparation of the treatment agent is completed, it is placed in a transparent container for static storage. During the process of storing the surface treatment agent for steel parts obtained in Example 2, the liquid in the container remains clear and transparent. No precipitate was seen.

[0036] The above-mentioned surface treatment agent for steel parts after 3 months of static storage was also put into a large-scale seamless steel pipe production enterprise in China in early ...

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PUM

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Abstract

The invention provides an iron and steel product surface treating agent and a preparation method thereof, and relates to the technical field of metal surface treating agents. The surface treating agent comprises, by weight, 12%-17% of phosphoric acid with the concentration of 85%, 3%-8% of composite phosphate, 7%-12% of nitric acid with the concentration of 65%, 5%-10% of corrosion inhibitor(s), 1%-3% of aqueous surface active agent(s), 3%-6% of zinc chrome, 4%-7% of polyol ester, and the balance water. The iron and steel product surface treating agent can be used for carrying out derusting, deoiling and phosphating on iron and steel products at the same time, and the generation amount of industrial waste water in the production process can be greatly reduced; the iron and steel product surface treating agent can be stored for a long time without lowering of the effectiveness, and uniform and compact phosphating films still can be formed on the surfaces of the iron and steel products even if the iron and steel product surface treating agent is stored for a long time; in addition, when the iron and steel product surface treating agent is used for carrying out comprehensive surface treating on the iron and steel products, the replacement frequency of bath solutions is low, the utilization rate of acid liquor is high, and the production cost of enterprises is low.

Description

technical field [0001] The invention relates to the technical field of a metal surface treatment agent, in particular to a surface treatment agent for iron and steel parts and a preparation method thereof. Background technique [0002] Steel parts need to undergo comprehensive surface treatment before painting. The current comprehensive surface treatment process usually includes derusting, degreasing, phosphating and other processes. [0003] At present, there are two types of rust removal methods in the industry: mechanical methods and chemical methods. Due to the high labor intensity, low efficiency and serious dust pollution of the mechanical method, except for a few cases, most manufacturers use chemical methods for rust removal. Chemical derusting, the simplest method is to use sulfuric acid to process the rust on the surface of steel parts. There are the following problems in the use of sulfuric acid derusting: the above-mentioned acid solution derusting agent is in t...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23C22/13
Inventor 王延飞刘静
Owner NANHUA UNIV
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