CN109468630B - Electrogalvanizing alkaline golden passivation solution - Google Patents
Electrogalvanizing alkaline golden passivation solution Download PDFInfo
- Publication number
- CN109468630B CN109468630B CN201811275747.2A CN201811275747A CN109468630B CN 109468630 B CN109468630 B CN 109468630B CN 201811275747 A CN201811275747 A CN 201811275747A CN 109468630 B CN109468630 B CN 109468630B
- Authority
- CN
- China
- Prior art keywords
- passivation solution
- passivation
- solution
- golden
- electrogalvanizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses an electrogalvanizing alkaline golden passivation solution, the pH value of the passivation solution is 8.5-9.5, and the passivation solution comprises the following components in percentage by weight: 20-30g/L of sodium molybdate, 15-20mL/L of ammonia water, 5-8g/L of ammonium chloride, 5-10g/L of sodium fluoride, 13-20mL/L of ethanol and the balance of water; the passivation solution disclosed by the invention does not contain toxic and harmful substances such as chromium and the like, is a novel environment-friendly passivation solution, is complementary in combination of ammonia water and molybdate in the passivation solution, and effectively avoids an excessive zinc coating dissolved by an acidic solution, so that the thickness of the zinc coating is ensured, the high requirement of molybdate on the thickness of the film is also reduced, and the passivation solution is stable, simple in passivation process, high in corrosion resistance of a passivation film, strong in adhesive force and uniform in film thickness.
Description
Technical Field
The invention relates to an electrogalvanizing alkaline golden passivation solution, which is mainly used for the post-treatment process of electrogalvanizing on the surface of steel parts, is chromium-free and acid-free, and belongs to the technical field of metal material surface treatment.
Background
Galvanization is a surface treatment technique in which a layer of zinc is plated on the surface for the purpose of material beauty or rust prevention. The standard electrode potential of zinc is-0.76V, and for a steel matrix, a zinc coating is an anode and has good corrosion resistance, and the thickness of the coating directly influences the protection performance of the steel matrix. After the zinc coating is subjected to special passivation treatment, color coating or light protection agent smearing, the protection performance can be well enhanced, and the decoration performance can be more attractive.
The surface of the protected material with poor corrosion resistance is covered by zinc with good corrosion resistance, and the protected material is separated from a corrosive medium, so that the purpose of controlling corrosion is achieved. It can not only greatly raise the corrosion resistance of protected material, but also its electroplating technology has the advantages of simple equipment, easy operation and low cost, etc., so that said method can be used as most common and important corrosion-resisting method. If no good post-treatment is carried out after zinc plating, the coating quickly darkens and white corrosion products ensue. In order to improve the corrosion resistance and appearance decoration performance of steel products, the steel products are generally passivated after being galvanized so as to form a chemical conversion coating on the surface of a zinc layer.
At present, most production lines use chromate passivation, wherein hexavalent chromium is high in toxicity and easy to cause cancer, the environment and human bodies are greatly damaged, trivalent chromium can be converted into hexavalent chromium during long-term storage and use, and the use and discharge of chromate are strictly limited by governments. Therefore, it is urgent to develop passivation technology meeting the environmental protection requirements.
The acid passivation systems reported at present are many, wherein silicate, molybdate, rare earth metal salt, organic matter and other systems exist, but a part of zinc can be dissolved in the galvanized sheet under the acid condition, so that the galvanized layer becomes thinner, and the occurrence of the condition can be effectively avoided under the alkaline condition, so that the thickness of the galvanized layer is ensured.
Disclosure of Invention
The invention aims to provide an electrogalvanizing alkaline golden passivation solution, the pH value of the passivation solution is 8.5-9.5, and the passivation solution comprises the following components in percentage by weight: 20-30g/L of sodium molybdate, 15-20mL/L of ammonia water, 5-8g/L of ammonium chloride, 5-10g/L of sodium fluoride, 13-20mL/L of ethanol and the balance of water.
The mass fraction of the ammonia water is 25-28%.
The water is deionized water.
The preparation method of the electrogalvanizing alkaline golden passivation solution specifically comprises the following steps:
(1) adding deionized water with the volume of 50-70% of the volume of the passivation solution required by preparation into a beaker;
(2) respectively adding required amounts of sodium molybdate, ethanol, ammonium chloride and sodium fluoride into the deionized water obtained in the step (1), and uniformly stirring until the sodium molybdate, the ethanol, the ammonium chloride and the sodium fluoride are completely dissolved to obtain a mixed solution;
(3) adding ammonia water in required amount into the solution obtained in the step (2), and stirring until uniform mixing;
(4) and (4) adjusting the pH value of the solution obtained in the step (3) to 8.5-9.5, and supplementing water to the required volume to obtain the alkaline golden passivation solution.
The passivation process of the passivation solution comprises the following steps: see electrogalvanizing workpiece bright dipping (3% HNO)3Room temperature, 5 s) → passivation (room temperature, passivation time 20-30 s) → drying, and washing with water is required between each two steps.
The passivation solution can be used for a surface passivation treatment process after electrogalvanizing of steel parts, and a golden passivation film with uniform distribution and good corrosion resistance can be obtained after passivation treatment.
The invention has the beneficial effects that:
(1) the passivation solution does not contain toxic and harmful substances such as chromium and the like, and is environment-friendly.
(2) The passivation solution is stable, the passivation process is simple, the passivation film has high corrosion resistance, strong adhesive force and uniform film thickness.
(3) The combination of ammonia water and molybdate in the passivation solution is complementary, so that excessive zinc coating dissolved by acidic solution is effectively avoided, the thickness of the zinc coating is ensured, and the high requirement of molybdate on the thickness of the film is also reduced.
(4) The appearance of the zinc coating treated by the passivating solution is a uniformly distributed golden passivating film, and the time of white rust appearing in a neutral salt spray test exceeds 100 hours.
Detailed Description
The present invention will be further described with reference to the following detailed description, but the scope of the present invention is not limited to the contents. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Example 1
The electrogalvanizing alkaline golden passivation solution has the pH value of 8.5 and comprises the following components in percentage by weight: 20g/L of sodium molybdate, 15mL/L of ammonia water, 5g/L of ammonium chloride, 5g/L of sodium fluoride and 13mL/L of ethanol, and the balance of water, wherein the mass fraction of the ammonia water is 25%.
The preparation method of the electrogalvanizing alkaline golden passivation solution takes 1L of passivation solution as an example, and specifically comprises the following steps:
(1) adding 500mL of deionized water with the volume being 50% of the volume of the passivation solution required by preparation into a beaker;
(2) respectively adding required amounts of sodium molybdate (20 g), ethanol (13 mL), ammonium chloride (5 g) and sodium fluoride (5 g) into the deionized water obtained in the step (1), and uniformly stirring until the sodium molybdate, the ethanol, the ammonium chloride and the sodium fluoride are completely dissolved to obtain a mixed solution;
(3) adding ammonia water (15mL) in required amount into the solution obtained in the step (2), and stirring until the ammonia water and the solution are uniformly mixed;
(4) and (3) supplementing water to the required volume of the solution obtained in the step (3), wherein the pH value of the passivation solution is just 8.5, the pH value is not required to be adjusted, and if the pH value is not 8.5, hydrochloric acid or ammonia water can be adopted for adjustment, so that the alkaline golden passivation solution is obtained.
The passivation solution obtained in the example is used for electrogalvanizing low-carbon steel sheet (40 multiplied by 50 multiplied by 1 mm) in laboratory3) The passivation treatment of (1) is to electroplate the low-carbon steel sheet for 20min, then to wash the low-carbon steel sheet in deionized water, then to put the low-carbon steel sheet in nitric acid with the mass fraction of 3% to emit light for 5s, to soak the low-carbon steel sheet in the passivation solution of the embodiment for 20s at room temperature, to wash the low-carbon steel sheet in the deionized water, and to dry the low-carbon steel sheet by a blower.
The electrogalvanized low-carbon steel sample passivated by the method has the advantages of uniform and bright appearance color, golden yellow color, strong film adhesion and 100-hour neutral salt spray resistance experiment; under the conditions of sealing and no light and room temperature, after the passivation solution is stored for 180 days, the pH value of the passivation solution is detected to be not changed greatly, the color and the transparency are the same as those of the previous passivation solution, after the passivation solution is used for passivating the electrogalvanized low-carbon steel sheet, the appearance color of the passivated electrogalvanized low-carbon steel sample is uniform and bright and is golden yellow, the film adhesion is strong, the neutral salt spray resistance experiment can reach 95 hours,
example 2
The electrogalvanizing alkaline golden passivation solution has a pH value of 9.5 and comprises the following components in percentage by weight: 30g/L of sodium molybdate, 20mL/L of ammonia water, 8g/L of ammonium chloride, 10g/L of sodium fluoride, 20mL/L of ethanol and the balance of water, wherein the mass fraction of the ammonia water is 28%.
The preparation method of the electrogalvanizing alkaline golden passivation solution takes 1L of passivation solution as an example, and specifically comprises the following steps:
(1) deionized water with the volume being 60% of the volume of the required passivation solution is added into the beaker, namely 600 mL;
(2) respectively adding required amounts of sodium molybdate (30 g), ethanol (20mL), ammonium chloride (8 g) and sodium fluoride (10 g) into the deionized water obtained in the step (1), and uniformly stirring until the sodium molybdate, the ethanol, the ammonium chloride and the sodium fluoride are completely dissolved to obtain a mixed solution;
(3) adding ammonia water (20mL) in required amount into the solution obtained in the step (2), and stirring until the ammonia water and the solution are uniformly mixed;
(4) and (3) supplementing water to the required volume of the solution obtained in the step (3), wherein the pH value of the passivation solution is just 9.5, the pH value is not required to be adjusted, and if the pH value is not 9.5, hydrochloric acid or ammonia water can be adopted for adjustment, so that the alkaline golden passivation solution is obtained.
The passivation solution obtained in the example is used for electrogalvanizing low-carbon steel sheet (40 multiplied by 50 multiplied by 1 mm) in laboratory3) The passivation treatment of (1) is to clean the electrogalvanized low-carbon steel sheet in clean water, then put the steel sheet in nitric acid with the mass fraction of 3% to emit light for 5s, soak the steel sheet in the passivation solution of the embodiment for 30s at room temperature, clean the steel sheet in deionized water and then use the steel sheetAnd drying by a blower.
The electrogalvanized low-carbon steel sample passivated by the method has the advantages of uniform and bright appearance color, golden yellow color, strong film adhesion and 120-hour neutral salt spray resistance experiment; under the conditions of sealed invisible light and room temperature, after the passivation solution is stored for 180 days, the pH value of the passivation solution is detected to be not changed greatly, the color and the transparency are the same as those of the previous passivation solution, after the passivation solution is used for passivating the electrogalvanized low-carbon steel sheet, the appearance color of the passivated electrogalvanized low-carbon steel sample is uniform and bright, is golden yellow, the film layer adhesion is strong, the neutral salt spray resistance experiment can reach 115 hours,
example 3
The electrogalvanizing alkaline golden passivation solution has a pH value of 9.0 and comprises the following components in percentage by weight: 25g/L of sodium molybdate, 18mL/L of ammonia water, 6g/L of ammonium chloride, 7g/L of sodium fluoride, 15mL/L of ethanol and the balance of water, wherein the mass fraction of the ammonia water is 26%.
The preparation method of the electrogalvanizing alkaline golden passivation solution takes 1L of passivation solution as an example, and specifically comprises the following steps:
(1) deionized water with the volume of 70% of the volume of the required passivation solution is added into a beaker, namely 700 mL;
(2) respectively adding required amounts of sodium molybdate (25 g), ethanol (15mL), ammonium chloride (6 g) and sodium fluoride (7 g) into the deionized water obtained in the step (1), and uniformly stirring until the sodium molybdate, the ethanol, the ammonium chloride and the sodium fluoride are completely dissolved to obtain a mixed solution;
(3) adding ammonia water (18 mL) in required amount into the solution obtained in the step (2), and stirring until the ammonia water and the solution are uniformly mixed;
(4) and (3) supplementing water to the required volume of the solution obtained in the step (3), wherein the pH value of the passivation solution is just 9.0, the pH value is not required to be adjusted, and if the pH value is not 9.0, hydrochloric acid or ammonia water can be adopted for adjustment, so that the alkaline golden passivation solution is obtained.
The passivation solution obtained in the example is used for electrogalvanizing low-carbon steel sheet (40 multiplied by 50 multiplied by 1 mm) in laboratory3) The passivation treatment of (1) is to electroplate the low-carbon steel sheet for 20min, then to wash the low-carbon steel sheet in clean water, then to put the low-carbon steel sheet in nitric acid with the mass fraction of 3% to emit light for 5s, and to use the passivation of the embodiment at room temperatureSoaking in the solution for 25s, washing with deionized water, and drying with blower.
The electrogalvanizing low-carbon steel sample passivated by the embodiment has uniform and bright appearance color, is golden yellow, has strong film adhesion, and can reach 110 hours in a neutral salt spray resistance experiment; under the conditions of sealing and no light and room temperature, after the passivation solution is stored for 180 days, the pH value of the passivation solution is detected to be not changed greatly, the color and the transparency are the same as those of the previous passivation solution, and after the passivation solution is used for passivating the electrogalvanized low-carbon steel sheet, the appearance color of the passivated electrogalvanized low-carbon steel sample is uniform and bright and is golden yellow, the film adhesion is strong, and the neutral salt spray resistance experiment can reach 100 hours.
Claims (1)
1. The electrogalvanizing alkaline golden passivation solution is characterized in that the pH value of the passivation solution is 8.5-9.5, and the passivation solution comprises the following components in percentage by weight: 20-30g/L of sodium molybdate, 15-20mL/L of ammonia water, 5-8g/L of ammonium chloride, 5-10g/L of sodium fluoride, 13-20mL/L of ethanol and the balance of water;
the mass fraction of the ammonia water is 25-28%;
when the passivation solution is used, the electro-galvanized workpiece after the bright dipping treatment is immersed in the passivation solution for normal temperature treatment for 20-30s and then dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811275747.2A CN109468630B (en) | 2018-10-30 | 2018-10-30 | Electrogalvanizing alkaline golden passivation solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811275747.2A CN109468630B (en) | 2018-10-30 | 2018-10-30 | Electrogalvanizing alkaline golden passivation solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109468630A CN109468630A (en) | 2019-03-15 |
| CN109468630B true CN109468630B (en) | 2021-02-05 |
Family
ID=65666500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811275747.2A Active CN109468630B (en) | 2018-10-30 | 2018-10-30 | Electrogalvanizing alkaline golden passivation solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109468630B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026902C (en) * | 1993-07-02 | 1994-12-07 | 北京化工学院 | Hydrophilic corrosion-resistant film former used on surface of aluminium heat exchanger and Al foil and film forming process |
| US6613390B2 (en) * | 2000-12-19 | 2003-09-02 | United Technologies Corporation | Compound, non-chromium conversion coatings for aluminum alloys |
| CN104911577B (en) * | 2015-06-18 | 2018-01-16 | 华南理工大学 | A kind of aluminium alloy non-chromium alkaline passivation liquid and aluminium alloy passivating method |
| CN105755456B (en) * | 2016-03-16 | 2018-04-24 | 昆明理工大学 | A kind of alkaline passivation liquid |
-
2018
- 2018-10-30 CN CN201811275747.2A patent/CN109468630B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109468630A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101146929B (en) | Process for sealing phosphoric acid anodized aluminums | |
| US6527841B2 (en) | Post-treatment for metal coated substrates | |
| US8075708B2 (en) | Pretreatment method for coating | |
| CN108300988A (en) | A kind of compound chrome-free tanning agent and preparation method of fast filming | |
| CN101142340A (en) | Process for preparing chromium conversion coatings for iron and iron alloys | |
| CN105779988A (en) | Chromate-free passivation solution for electroplated zinc and passivation technology thereof | |
| CN107740085A (en) | A kind of composite coloured passivating solution of environment-friendly type and preparation method thereof | |
| US3132055A (en) | Antirusting surface treating method for iron and steel products | |
| CN104498925A (en) | Environmentally friendly metal surface treatment fluid based on multifunctional group alkyl phosphate and application thereof | |
| JP3139795B2 (en) | Metal surface treatment agent for composite film formation | |
| CN101166848A (en) | Process for preparing chromium conversion coatings for magnesium alloys | |
| CN101525747B (en) | Clean rare-earth salt passivation solution | |
| CN107574430A (en) | A kind of silicate bright blue passivation liquid and preparation method thereof | |
| CN109468630B (en) | Electrogalvanizing alkaline golden passivation solution | |
| CN106435547B (en) | A kind of environment-protective process replacing chromic acid passivation | |
| CN108546941B (en) | Environment-friendly titanium salt color passivation solution | |
| CN115074714B (en) | Treatment liquid for composite conversion film on surface of tin plate and process for preparing conversion film by using treatment liquid | |
| CN107400883A (en) | Silane/zirconium composite treating agent and preparation method thereof before galvanized sheet application | |
| CN113088952A (en) | Trivalent chromium passivator for galvanized material and preparation method and use method thereof | |
| CN1114665C (en) | Zinc base water soluble anti-corrosion paint for metal surface and its prepn. method | |
| CN109056019A (en) | A kind of electrogalvanizing black passivation solution and preparation method thereof | |
| CN104109851A (en) | Antirust aluminum alloy surface treating agent | |
| CN108531900A (en) | A kind of composite coloured passivating solution of environment-friendly type and preparation method thereof | |
| CN105951083B (en) | Galvanized steel plain sheet aqueous composite passivation solution and preparation method thereof | |
| CN103849864A (en) | Galvanizing chrome-free iridescent passivation liquid as well as preparation and application methods thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |