CN105200414A - Steel and iron surface phosphating agent and preparation method thereof - Google Patents
Steel and iron surface phosphating agent and preparation method thereof Download PDFInfo
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- CN105200414A CN105200414A CN201510763380.9A CN201510763380A CN105200414A CN 105200414 A CN105200414 A CN 105200414A CN 201510763380 A CN201510763380 A CN 201510763380A CN 105200414 A CN105200414 A CN 105200414A
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Abstract
The invention provides a steel and iron surface phosphating agent and a preparation method thereof, relating to the technical field of metal surface treating agents. The steel and iron surface phosphating agent comprises the following components in percentage by weight: 3% of potassium dichromate, 3.5% of composite phosphate, 16% of 65% nitric acid, 18% of 85% phosphoric acid, 0.1% of a CyDTA complexing agent, 7% of sodium sulfite and the balance of water. The steel and iron surface phosphating agent can be used for simultaneously phosphating and passivating the surface of a steel pipe; the quantity of acid fog generated by the phosphating agent in the actual production process is relatively low, so that the production environment of a workshop is greatly improved; more importantly, the steel and iron surface phosphating agent can form a uniform and compact phosphating film on the surface of a steel and iron workpiece after being stored for two months, and the problem of effect lowering caused by overlong storage time can be avoided; and in addition, the phosphating agent can also form a compact passivating film on the surface of the steel pipe, and the steel pipe treated by using the phosphating agent has favorable corrosion resistance.
Description
Technical field
The present invention relates to a kind of metal conditioner technical field, particularly a kind of steel surface phosphating agent and preparation method thereof.
Background technology
Steel piece needs through surface generalization process before application, and current surface generalization treating processes generally includes the operations such as rust cleaning, oil removing, phosphatization, passivation.
Need during bonderizing to use Phosphating Solution, Phosphating Solution (comprising above-mentioned conventional Phosphating Solution) conventional at present usually has some shortcomings part in transport, storage and use procedure, concrete manifestation is as follows: the Phosphating Solution shelf-time mostly can not more than one month, shelf-time one is long, can because the sediment of oxidation, disproportionation reaction generation grey, effective constituent thus in Phosphating Solution receives destruction, thus causes phosphatization effect to reduce, and the phosphatize phosphate coat finally obtained becomes loose.Carry out phosphatization, Passivation Treatment to steel pipe in the industry at present usually to carry out in the following ways: 1, bonderizing carries out Passivation Treatment with concentrated acid after completing again, this kind of mode needs to control well the concentration of acid in treatment trough, if the concentration of acid is lower than threshold value, not only can not passivation effect be played, also can aggravate steel tube surface corrosion, and the acid mist amount of this kind of processing mode generation is large, work under bad environment.2, in treatment trough, appropriate passivation treating agent is added when bonderizing, this just needs the proportioning of phosphating agent and passivation treating agent must in a suitable scope, such as, otherwise effectiveness each other can be caused to reduce, and Passivation Treatment dosage too much will affect phosphatization effect, cause phosphatization lepthymenia.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of can simultaneously to steel pipe carry out phosphatization, Passivation Treatment and acid mist generation is few, phosphatization and good passivation effect, can long-term storage and steel surface phosphating agent that unlikely effectiveness reduces and preparation method thereof.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of steel surface phosphating agent, and the weight proportion of its component is: the phosphatase 11 8% that the nitric acid 16% that potassium bichromate 3%, composite phosphate 3.5%, concentration are 65%, concentration are 85%, CyDTA complexing agent 0.1%, S-WAT 7%, surplus are water.
In the present invention, the method preparing above-mentioned steel surface phosphating agent comprises the following steps:
The first step, according to above-mentioned weight proportion, each component is ready to, and be contained in cell therefor, from the container of dress water, get a part of water to add in reactor and the water in reactor is heated to 42-47 DEG C, then while stir, in reactor, successively phosphoric acid, composite phosphate, CyDTA complexing agent, S-WAT, potassium bichromate is added;
Second step, is cooled to normal temperature by gained solution after said components is dissolved completely, then under ventilation condition, adds nitric acid, finally adds and can obtain steel surface phosphating agent into remaining water;
Above steps is all carry out at ambient pressure.
The beneficial effect that the present invention obtains is: steel surface phosphating agent provided by the invention can carry out phosphatization to steel tube surface simultaneously, Passivation Treatment, in actual production process, the acid mist amount that this treatment agent produces is less, substantially improve Workshop Production environment, what is more important, this steel surface phosphating agent still can form on steel piece surface the phosphatize phosphate coat evenly compacted after depositing two months, the problem that effectiveness reduces can not be there is because the shelf-time is long, in addition, this treatment agent can also form passive film closely in steel tube surface, steel pipe after this treatment agent process has good erosion resistance.
Embodiment
As one embodiment of the present invention, a kind of steel surface phosphating agent, the weight proportion of its component is: the phosphatase 11 8% that the nitric acid 16% that potassium bichromate 3%, composite phosphate 3.5%, concentration are 65%, concentration are 85%, CyDTA complexing agent 0.1%, S-WAT 7%, surplus are water.
As another aspect of the present invention, the method preparing above-mentioned steel surface phosphating agent comprises the following steps:
The first step, by above-mentioned weight proportion, each component is ready to, and be contained in cell therefor, from the container of dress water, get a part of water to add in reactor and the water in reactor is heated to 42-47 DEG C, then while stir, in reactor, successively phosphoric acid, composite phosphate, CyDTA complexing agent, S-WAT, potassium bichromate is added;
Second step, is cooled to normal temperature by gained solution after said components is dissolved completely, then under ventilation condition, adds nitric acid, finally adds and can obtain steel surface phosphating agent into remaining water;
Above steps is all carry out at ambient pressure.
For the ease of the understanding of those skilled in the art, below in conjunction with embodiment, the present invention is further illustrated, and the content that embodiment is mentioned not is limitation of the invention.
embodiment 1:
At ambient pressure, according to: potassium bichromate 3%, composite phosphate 3.5%, concentration is the nitric acid 16% of 65%, concentration is the phosphatase 11 8% of 85%, CyDTA complexing agent 0.1%, S-WAT 7%, surplus is that each component is ready to by the weight proportion of water, and said components is contained in cell therefor, then from the container of dress water, get a part of water to add in reactor and the water in reactor is heated to 42-47 DEG C, then while stir, while successively add phosphoric acid in reactor, composite phosphate, CyDTA complexing agent, S-WAT, potassium bichromate, after said components is dissolved completely, gained solution is cooled to normal temperature, then under ventilation condition, nitric acid is added, finally add the steel surface phosphating agent that can obtain the present embodiment into remaining water, above-mentioned steps should be carried out at ambient pressure.
After this, first the steel surface phosphating agent obtained loading transparent vessel is left standstill and deposit 2 months, observe the situation of throw out generation in container during this period every day and note down, then with depositing the treatment agent after 2 months, bonderizing is carried out to steel tube surface, using method and the phosphating operation mode of the prior art of above-mentioned steel surface phosphating agent are similar, it specifically uses step to be: first steel surface phosphating agent and water be watered by the weight ratio of 1:1 and mix, treatment solution can be obtained, then will obtain treatment solution and inject treatment trough, steel pipe adopts the mode of dipping to carry out surface treatment, steel piece of frequently slinging in treating processes is shaken to accelerate treatment progress in groove, shorten the treatment time, above-mentionedly steel surface phosphating agent is watered and is all at normal temperature by the process that the treatment solution obtained carries out steel tube surface process, carry out under the condition of normal pressure.
It should be noted that, carrying out in the process of steel tube surface comprehensive treating process with above-mentioned steel surface phosphating agent, need the pH value for the treatment of solution in periodic detection groove, just need the rust removing solution in acid tank all to be changed when pH value is greater than 3.6, when pH value is less than 2.5, but when processing speed is slow, new treatment solution can be added to improve comprehensive treating process speed in treatment trough in the past.
Leave standstill in the process deposited the present embodiment 1 being obtained steel surface phosphating agent, liquid in container keeps the state of clear always, has no throw out and produces.
Above-mentioned steel surface phosphating agent drops in certain large-sized seamless steel pipe manufacturing enterprise domestic and carries out the test of surface generalization process for producing at the beginning of 2015, test period is ended at the beginning of 2015 10 months, draw to draw a conclusion: when the steel surface phosphating agent provided with the present embodiment carries out steel tube surface bonderizing (further comprises Passivation Treatment) by weight the treatment solution that 1:1 is watered modulation in fact simultaneously, the acid mist amount of production scene is compared and was obviously reduced in the past, after steel pipe process completes, examine under a microscope, the phosphatize phosphate coat that steel tube surface is formed and passive film evenly compact, in addition salt spray resistance test is carried out to the steel pipe before application, find that steel pipe can by the salt-fog test of 24 hours, there is good corrosion resistance nature, peel strength test is carried out to the dope layer of steel tube surface after application, discovery paint film adhesion is good, stripping strength is up to standard.
As can be seen from the test-results of above-described embodiment, steel surface phosphating agent provided by the invention can carry out phosphatization, Passivation Treatment to steel pipe simultaneously, greatly reduces the acid mist generation in treating processes, improves production environment; What is more important, this steel surface phosphating agent still can form on steel piece surface the phosphatization, the passive film that evenly compact after depositing 2 months, can not occur the problem that effectiveness reduces because the shelf-time is long.
Above-described embodiment is the present invention's preferably implementation, and in addition, the present invention can also realize by alternate manner, and under the prerequisite not departing from the technical program design, any apparent replacement is all within protection scope of the present invention.
Finally, it should be emphasized that, the improvements of the present invention relative to prior art are understood more easily in order to allow those of ordinary skill in the art, descriptions more of the present invention are simplified, and for the sake of clarity, present specification is omitted some other elements, and those of ordinary skill in the art it is to be appreciated that these elliptical elements also can form content of the present invention.
Claims (2)
1. a steel surface phosphating agent, the weight proportion of its component is: the phosphatase 11 8% that the nitric acid 16% that potassium bichromate 3%, composite phosphate 3.5%, concentration are 65%, concentration are 85%, CyDTA complexing agent 0.1%, S-WAT 7%, surplus are water.
2. prepare the method for steel surface phosphating agent according to claim 1, comprise the following steps:
The first step, according to weight proportion according to claim 1, each component is ready to, and be contained in cell therefor, from the container of dress water, get a part of water to add in reactor and the water in reactor is heated to 42-47 DEG C, then while stir, in reactor, successively phosphoric acid, composite phosphate, CyDTA complexing agent, S-WAT, potassium bichromate is added according to weight proportion according to claim 1;
Second step, is cooled to normal temperature by gained solution after said components is dissolved completely, then under ventilation condition, adds nitric acid, finally adds and can obtain steel surface phosphating agent according to claim 1 into remaining water;
Above steps is all carry out at ambient pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510763380.9A CN105200414A (en) | 2015-11-11 | 2015-11-11 | Steel and iron surface phosphating agent and preparation method thereof |
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| CN201510763380.9A CN105200414A (en) | 2015-11-11 | 2015-11-11 | Steel and iron surface phosphating agent and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618860A (en) * | 2012-04-11 | 2012-08-01 | 浙江海洋学院 | High-efficiency iron rust conversion agent |
| CN103436872A (en) * | 2013-07-01 | 2013-12-11 | 谢俊磊 | Comprehensive treatment agent and use method thereof |
| CN104164662A (en) * | 2014-07-30 | 2014-11-26 | 武汉钢铁(集团)公司 | Roller coating conversion treatment agent for colored coated steel plate |
-
2015
- 2015-11-11 CN CN201510763380.9A patent/CN105200414A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618860A (en) * | 2012-04-11 | 2012-08-01 | 浙江海洋学院 | High-efficiency iron rust conversion agent |
| CN103436872A (en) * | 2013-07-01 | 2013-12-11 | 谢俊磊 | Comprehensive treatment agent and use method thereof |
| CN104164662A (en) * | 2014-07-30 | 2014-11-26 | 武汉钢铁(集团)公司 | Roller coating conversion treatment agent for colored coated steel plate |
Non-Patent Citations (1)
| Title |
|---|
| 代海宁: "《电化学基本原理及应用》", 31 March 2014, 冶金工业出版社 * |
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Application publication date: 20151230 |