CN112725785A - Blue passivator for steel parts and preparation method thereof - Google Patents
Blue passivator for steel parts and preparation method thereof Download PDFInfo
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- CN112725785A CN112725785A CN202011508357.2A CN202011508357A CN112725785A CN 112725785 A CN112725785 A CN 112725785A CN 202011508357 A CN202011508357 A CN 202011508357A CN 112725785 A CN112725785 A CN 112725785A
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- parts
- acid
- silica sol
- steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
Abstract
The invention discloses a blue passivator for steel parts and a preparation method thereof, wherein the blue passivator comprises the following raw materials in parts by weight: 150-220 parts of chromium sulfate, 80-120 parts of nano silica sol, 20-30 parts of malonic acid, 70-80 parts of sodium hydroxide, 100-120 parts of cobalt sulfate, 40-50 parts of citric acid, 10-20 parts of sodium nitrate, 20-30 parts of nitric acid, 30-40 parts of sulfuric acid, 10-20 parts of sodium fluoride and a proper amount of deionized water. After the nano-scale silica sol is added into the blue passivator for the steel part, the nano-scale silica sol can fill micropores of a passivation film layer, so that the prepared film layer is thicker, the pores of the passivation film are sealed, and the corrosion resistance of the passivation film is greatly improved.
Description
Technical Field
The invention relates to the technical field of blue passivators, in particular to a blue passivator for steel parts and a preparation method thereof.
Background
The purpose of electrogalvanizing is to prevent the corrosion of steel and iron objects, improve the corrosion resistance and service life of steel, and simultaneously add decorative appearance to products, and the steel can be weathered, corroded by water or mud with the increase of time. The amount of iron and steel corroded in China every year is almost one tenth of the total amount of iron and steel, so in order to protect the service life of the iron and steel or parts thereof, the iron and steel are generally processed by electrogalvanizing. Since zinc is more conductive than steel, it provides excellent protection and acts as a hum medium. However, a great potential difference exists between the steel material and the plating layer, so that the dissolution rate of the plating layer is high. However, zinc is an active metal, and if the surface of the galvanized steel is not treated after galvanization, a zinc layer reacts with water, oxygen and the like in the air, a bright zinc surface becomes dark quickly, and the zinc layer is corroded, so that the corrosion resistance rate of the base metal is influenced, and the galvanized steel layer is passivated. The process has the advantages of simple equipment, easy operation, low cost and the like, thereby becoming a common technique in a variety of surface treatment techniques.
The early chromate passive film mainly uses hexavalent chromium as main salt, and the formed film has excellent performance and good stability of the passive solution. However, because of the harmfulness of hexavalent chromium, studies have been conducted on chromium-free passivation. However, the chromium-free passivation process is complicated in kind, and the process is not yet mature, and cannot meet the industrial requirements. The trivalent chromium compound can also form a passivation film under an acidic condition, the passivation of the trivalent chromium compound is popularized, but the corrosion resistance of the trivalent chromium compound passivation layer is much weaker than that of the traditional hexavalent chromium passivation layer, because the thickness of the passivation film of the traditional trivalent chromium blue passivator is only about 80nm, the corrosion resistance of the product is influenced. Based on the technical problem, the invention aims to solve the technical problem of how to design a blue passivator for steel parts and a preparation method thereof.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a blue passivator for steel parts and a preparation method thereof.
The invention solves the technical problems through the following technical means:
the blue passivator for the steel part comprises the following raw materials in parts by weight: 150-220 parts of chromium sulfate, 80-120 parts of nano silica sol, 20-30 parts of malonic acid, 70-80 parts of sodium hydroxide, 100-120 parts of cobalt sulfate, 40-50 parts of citric acid, 10-20 parts of sodium nitrate, 20-30 parts of nitric acid, 30-40 parts of sulfuric acid, 10-20 parts of sodium fluoride and a proper amount of deionized water.
The preparation method of the blue passivator for the steel part comprises the following steps:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 75-85 ℃, preserving heat for 3-4 hours, and then standing and cooling to 20-30 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 25-35 ℃, adding cobalt sulfate and nano silica sol, stirring for 8-12min, and standing for 2-3h to obtain the catalyst.
The invention has the advantages that: after the nano-scale silica sol is added into the blue passivator for the steel part, the nano-scale silica sol can fill micropores of a passivation film layer, so that the prepared film layer is thicker, the pores of the passivation film are sealed, and the corrosion resistance of the passivation film is greatly improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1, a blue passivator for steel parts, comprising the following parts by weight (kg) of raw materials: 150 parts of chromium sulfate, 80 parts of nano silica sol, 20 parts of malonic acid, 70 parts of sodium hydroxide, 100 parts of cobalt sulfate, 40 parts of citric acid, 10 parts of sodium nitrate, 20 parts of nitric acid, 30 parts of sulfuric acid, 10 parts of sodium fluoride and a proper amount of deionized water.
The preparation method of the blue passivator for the steel part comprises the following steps:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 75 ℃, preserving heat for 3 hours, and then standing and cooling to 20 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 25 ℃, adding cobalt sulfate and nano silica sol, stirring for 8min, and standing for 2h to obtain the catalyst.
Example 2, a blue passivator for steel parts, comprising the following raw materials in parts by weight (kg): chromium sulfate 185, nano silica sol 100, malonic acid 25, sodium hydroxide 75, cobalt sulfate 110, citric acid 45, sodium nitrate 15, nitric acid 25, sulfuric acid 35, sodium fluoride 15 and a proper amount of deionized water.
The preparation method of the blue passivator for the steel part comprises the following steps:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 80 ℃, preserving heat for 3.5 hours, and then standing and cooling to 25 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 30 ℃, adding cobalt sulfate and nano silica sol, stirring for 10min, and standing for 2.5h to obtain the catalyst.
Example 3, a blue passivator for steel parts, comprising the following parts by weight (kg) of raw materials: chromium sulfate 220, nano silica sol 120, malonic acid 30, sodium hydroxide 80, cobalt sulfate 120, citric acid 50, sodium nitrate 20, nitric acid 30, sulfuric acid 40, sodium fluoride 20 and a proper amount of deionized water.
The preparation method of the blue passivator for the steel part comprises the following steps:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 85 ℃, preserving heat for 4 hours, and then standing and cooling to 30 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 35 ℃, adding cobalt sulfate and nano silica sol, stirring for 12min, and standing for 3h to obtain the catalyst.
Comparative example, a blue passivator for steel parts, comprising the following parts by weight (kg) of raw materials: chromium sulfate 185, malonic acid 25, sodium hydroxide 75, cobalt sulfate 110, citric acid 45, sodium nitrate 15, nitric acid 25, sulfuric acid 35, sodium fluoride 15, and an appropriate amount of deionized water.
The preparation method of the blue passivator for the steel part comprises the following steps:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 80 ℃, preserving heat for 3.5 hours, and then standing and cooling to 25 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 30 ℃, adding cobalt sulfate and nano silica sol, stirring for 10min, and standing for 2.5h to obtain the catalyst.
The zinc-nickel alloys passivated in examples 1-3 and comparative example were subjected to neutral salt spray accelerated corrosion tests, and the test results are shown in the following table:
the salt spray test box used in the test is a Cyclo YWX-010, the salt solution used is a sodium chloride solution with the mass concentration of 5%, the pH value of the salt solution used is 6.9, the temperature in the test box is 33-37 ℃, the temperature of a saturated air barrel is 44-48 ℃, the test surface and the vertical plane of a test workpiece form 15 degrees, the relative humidity in the test box is more than 85 percent, and the pressure of compressed air is 1kg/cm2。
As can be seen from the above table, the passivates of examples 1-3 exhibited white rust at test time 600h and no red rust at test time 700h, whereas the passivates of comparative examples exhibited white rust at test time 500h and red rust at test time 600h, and it is apparent that the passivates of examples 1-3 exhibited better corrosion resistance than the passivates of comparative examples,
the reasons why the above test results were obtained are: the nano silica sol is added in the embodiments 1-3, but not in the comparative examples, and after the nano silica sol is added, the nano silica sol can fill the micropores of the passivation film layer, so that the prepared film layer is thicker, the pores of the passivation film are sealed, and the corrosion resistance of the passivation film is greatly improved.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. The blue passivator for steel parts is characterized by comprising the following raw materials in parts by weight: 150-220 parts of chromium sulfate, 80-120 parts of nano silica sol, 20-30 parts of malonic acid, 70-80 parts of sodium hydroxide, 100-120 parts of cobalt sulfate, 40-50 parts of citric acid, 10-20 parts of sodium nitrate, 20-30 parts of nitric acid, 30-40 parts of sulfuric acid, 10-20 parts of sodium fluoride and a proper amount of deionized water.
2. A method for preparing a blue passivator for steel parts according to claim 1, comprising the steps of:
mixing chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heating to 75-85 ℃, preserving heat for 3-4 hours, and then standing and cooling to 20-30 ℃;
II, adding sodium hydroxide, sodium nitrate and sodium fluoride, and stirring and mixing uniformly;
III, adjusting the temperature of the mixed solution to 25-35 ℃, adding cobalt sulfate and nano silica sol, stirring for 8-12min, and standing for 2-3h to obtain the catalyst.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011508357.2A CN112725785A (en) | 2020-12-18 | 2020-12-18 | Blue passivator for steel parts and preparation method thereof |
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| CN202011508357.2A CN112725785A (en) | 2020-12-18 | 2020-12-18 | Blue passivator for steel parts and preparation method thereof |
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| CN112725785A true CN112725785A (en) | 2021-04-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445036A (en) * | 2021-07-20 | 2021-09-28 | 科文特亚环保电镀技术（江苏）有限公司 | Zinc-nickel alloy blue passivator and preparation process thereof |
| CN114959674A (en) * | 2022-06-14 | 2022-08-30 | 广东比格莱科技有限公司 | Trivalent chromium blue zinc water and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858302A (en) * | 2006-06-09 | 2006-11-08 | 广东多正化工科技有限公司 | High anti-corrosion zinc coating trivalent chromium lue-white passivating agent and its preparing method |
| CN101158038A (en) * | 2007-10-11 | 2008-04-09 | 上海交通大学 | High corrosion resistant trivalent chromium blue-white deactivator and preparation method thereof |
| CN103687979A (en) * | 2011-07-15 | 2014-03-26 | 油研工业股份有限公司 | Aqueous acidic composition for forming chromium-containing conversion coating on ferrous member, and ferrous member having conversion coating formed using said composition |
-
2020
- 2020-12-18 CN CN202011508357.2A patent/CN112725785A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858302A (en) * | 2006-06-09 | 2006-11-08 | 广东多正化工科技有限公司 | High anti-corrosion zinc coating trivalent chromium lue-white passivating agent and its preparing method |
| CN101158038A (en) * | 2007-10-11 | 2008-04-09 | 上海交通大学 | High corrosion resistant trivalent chromium blue-white deactivator and preparation method thereof |
| CN103687979A (en) * | 2011-07-15 | 2014-03-26 | 油研工业股份有限公司 | Aqueous acidic composition for forming chromium-containing conversion coating on ferrous member, and ferrous member having conversion coating formed using said composition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445036A (en) * | 2021-07-20 | 2021-09-28 | 科文特亚环保电镀技术（江苏）有限公司 | Zinc-nickel alloy blue passivator and preparation process thereof |
| CN114959674A (en) * | 2022-06-14 | 2022-08-30 | 广东比格莱科技有限公司 | Trivalent chromium blue zinc water and preparation method thereof |
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Application publication date: 20210430 |
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