CN108930055B - Metal surface nano coating treatment method - Google Patents
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- CN108930055B CN108930055B CN201810786462.9A CN201810786462A CN108930055B CN 108930055 B CN108930055 B CN 108930055B CN 201810786462 A CN201810786462 A CN 201810786462A CN 108930055 B CN108930055 B CN 108930055B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
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Abstract
The invention relates to a metal surface nano coating treatment method, which comprises the following steps: A. cleaning the metal surface with a cleaning solution; B. treating the metal in alkali liquor; C. pretreating in acid liquor containing sulfuric acid; D. using graphite plate as cathode and metal as anode, putting them into electrolyte containing sulfuric acid and phosphoric acid to make direct current electrolysis, and making the metal surface form a layer of oxide film, said oxide film is a micropore containing 20-200 nm; E. soaking the oxidized metal in the nano coating solution; F. the metal is protected in polyalkenyl phosphate. The invention can obviously improve the yield of the nano coating, and the bonding force of the nano coating is obviously better than that of the prior art.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a metal surface nano-coating treatment method.
Background
Nano spraying is the application of nano technology in engineering, and is a novel spraying technology for forming a layer of compact nano coating on the surface of an object. The coating contains high-hardness and high-corrosion-resistance nano materials, can provide various colors and gloss, is environment-friendly, economical and durable surface treatment, and adopts the direct spraying mode in the existing nano spraying technology, so that the combination of the coating and the metal surface is poor, the coating is easy to fall off, and the coating is easy to have poor appearance such as uneven step thickness.
Disclosure of Invention
Compared with the prior art, the invention can obviously improve the yield and has the advantages that the bonding force of the coating is obviously better than that of the prior art, and the invention is realized by the following technical scheme.
The metal surface nano coating treatment method comprises the following steps:
A. cleaning the metal surface with a cleaning solution;
B. treating the metal in alkali liquor;
C. pretreating in acid liquor containing sulfuric acid;
D. using graphite plate as cathode and metal as anode, putting them into electrolyte containing sulfuric acid and phosphoric acid to make direct current electrolysis, and making the metal surface form a layer of oxide film, said oxide film is a micropore containing 20-200 nm;
E. soaking the oxidized metal in the nano coating solution;
F. the metal is protected in polyalkenyl phosphate.
Further, the weight ratio of the nano coating solution is as follows: 5-6% of water-based polyurethane, 1-2% of polyvinyl alcohol, 13-15% of diethyl phosphate and 77-80% of water.
Further, the cleaning process in the step a specifically includes: soaking metal in a degreasing agent solution of a mixed solution of sodium phosphate, sodium carbonate and sodium pyrophosphate with the mass concentration of 45-55 g/L for 5-8 minutes at the temperature of 50-60 ℃.
Further, in the alkali liquor treatment process in the step B, the concentration of the NAOH solution in the NAOH solution is 40-60g/L, 1-2 minutes and 30-50 ℃.
Further, the step C includes a method of pretreatment in an acid solution containing sulfuric acid, specifically: putting metal into the sulfuric acid solution, wherein the concentration is 50-100g/L, the time is 1-2 minutes, and the temperature is 20-30 ℃.
Further, the step D comprises an electrochemical electrolysis treatment method, specifically, a solution with the sulfuric acid concentration of 50-100g/L and the phosphoric acid concentration of 50-100/L is introduced into the solution with the current density of 0.03-0.6A/cm 2, and the temperature is controlled at 30-60 ℃.
Further, in the step E, the nano coating solution is soaked for 1-5 minutes at a concentration of 200-300ml/L and the temperature is controlled at 20-40 ℃.
Further, in the step F, the metal protection treatment is to put the metal with the nano coating on the surface into the poly alkenyl phosphate for soaking for 1 to 2 minutes, the temperature is 20 to 40 ℃, and the concentration of the poly alkenyl phosphate is 30 to 100 g/L.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and 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.
The invention relates to a metal surface nano coating treatment method, which is to spray a layer of nano coating on the surface of metal and comprises the following steps:
step A, cleaning the metal surface by using a cleaning solution;
step B, treating the metal in alkali liquor;
step C, pretreating in acid liquor containing sulfuric acid;
d, taking the graphite plate as a cathode and the metal as an anode, and putting the graphite plate and the metal into electrolyte containing sulfuric acid and phosphoric acid for direct current electrolysis to form an oxide film on the surface of the metal, wherein the oxide film is a micropore containing 20-200 nanometers;
step E, putting the oxidized metal into the nano coating solution for soaking;
and F, protecting the metal in the polyalkenyl phosphate.
The nano-coating obtained through the above steps exists inside and on the oxide film nano-pores, and the nano-coating can be well bonded with the spray coating, maintaining good bonding force, and will be described below through specific examples.
The first embodiment is as follows:
firstly, cleaning the surface of metal, specifically, soaking the metal in a degreasing agent solution of a mixed solution of sodium phosphate, sodium carbonate and sodium pyrophosphate with a mass concentration of 45g/L for 8 minutes, wherein the temperature is set at 50 ℃.
And secondly, treating in alkali liquor, wherein the alkali liquor is an NAOH solution, the concentration of the NAOH is 40g/L, placing the metal treated in the step in the NAOH solution for 2 minutes, controlling the temperature at 30 ℃, and further cleaning the metal.
And thirdly, a pretreatment method in a sulfuric acid solution, namely, putting metal into the sulfuric acid solution, wherein the concentration is 50g/L, the treatment time is 2 minutes, the temperature is set at 20 ℃, and films such as oxide on the surface of the metal are removed.
And fourthly, performing electrochemical electrolysis treatment, namely, setting the concentration of sulfuric acid to be 50g/L and the concentration of phosphoric acid to be 50/L, introducing current density to be 0.03/cm2, controlling the temperature to be 30 ℃, and performing surface electrochemical treatment on the metal to form an oxide film on the surface of the metal, wherein the oxide film contains micropores with the diameter of 20-200 nanometers, and the micropores are irregularly distributed on the surface of the metal.
And fifthly, treating the metal nano coating, wherein in the nano coating solution, the metal is soaked for 5 minutes in the nano coating solution containing 6 percent of aqueous polyurethane, 1 percent of polyvinyl alcohol, 13 percent of diethyl phosphate and 80 percent of water, the concentration is 200ml/L, the temperature is controlled to be 20 ℃, and the nano coating is combined on the oxide film.
Sixthly, performing metal protection treatment, namely soaking the metal with the nano coating on the surface in polyalkenyl phosphate for 2 minutes, setting the temperature at 20 ℃, and setting the concentration of the polyalkenyl phosphate to be 100g/L to obtain the protective layer of the nano coating.
Example two:
firstly, cleaning, in particular, soaking metal in a degreasing agent solution of a mixed solution of sodium phosphate, sodium carbonate and sodium pyrophosphate with the mass concentration of 55g/L for 5 minutes at the temperature of 60 ℃, and cleaning the surface of the metal.
And secondly, treating in alkali liquor, such as an NaOH solution, wherein the concentration of the NaOH is 60g/L, the soaking time is 1 minute, the temperature is set to be 50 ℃, and further cleaning the metal surface.
And thirdly, pretreating in a sulfuric acid solution, putting metal into the sulfuric acid solution, wherein the concentration is 100g/L, the treatment time is 1 minute, the temperature is 30 ℃, and an oxide film on the surface of the metal is removed.
Fourthly, electrochemical electrolysis treatment is carried out, and the current density is 0.6A/cm2 is led into the solution with the sulfuric acid concentration of 100g/L and the phosphoric acid concentration of 100/L. Controlling the temperature at 60 ℃, and carrying out surface electrochemical treatment on the metal to form an oxide film on the metal surface, wherein the oxide film contains micropores with the diameter of 20-200 nanometers, and the micropores are irregularly distributed on the metal surface.
Fifthly, treating the metal nano coating, wherein in the nano coating solution, the weight ratio of the nano coating solution is as follows: 6 percent of water-based polyurethane, 2 percent of polyvinyl alcohol, 15 percent of diethyl phosphate and 77 percent of water are soaked for 1 minute with the concentration of 300ml/L, the temperature is controlled at 40 ℃, so that the nano coating is combined on the oxide film.
Sixthly, performing metal protection treatment, namely soaking the metal with the nano coating on the surface in polyalkenyl phosphate for 1 minute at the temperature of 40 ℃ and the concentration of the polyalkenyl phosphate of 100g/L to obtain the protective layer of the nano coating.
Compared with the prior art, the invention can obviously improve the yield of the metal treated by the steps and has the advantage that the bonding force of the coating is obviously better than that of the prior art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The metal surface nano coating treatment method comprises the following steps: A. cleaning the metal surface with a cleaning solution; B. treating the metal in alkali liquor; C. pretreating in acid liquor containing sulfuric acid;
D. taking a graphite plate as a cathode and a metal as an anode, and putting the graphite plate into an electrolyte containing sulfuric acid and phosphoric acid for direct current electrolysis to form an oxide film on the surface of the metal; E. soaking the oxidized metal in the nano coating solution; f. The metal is protected in polyalkenyl phosphate, and the method is characterized in that:
in the step E, the weight ratio of the nano coating solution for soaking the oxidized metal is as follows: 5-6% of water-based polyurethane, 1-2% of polyvinyl alcohol, 13-15% of diethyl phosphate and 77-80% of water;
the oxide film is provided with micropores with the diameter of 20-200 nanometers.
2. The method for treating the surface of the metal nano-coating according to claim 1, wherein the cleaning process in the step A is specifically as follows: soaking metal in a degreasing agent solution of a mixed solution of sodium phosphate, sodium carbonate and sodium pyrophosphate with the mass concentration of 45-55 g/L for 5-8 minutes, and setting the temperature to be 50-60 ℃.
3. The method for treating the surface of a metal nano-coating according to claim 1, wherein in the alkali solution treatment process in the step B, the alkali solution is an NAOH solution, the concentration of the NAOH is 40-60g/L, and the metal is soaked in the NAOH solution for 1-2 minutes at the temperature of 30-50 ℃.
4. The surface treatment method of a metal nanocoating according to claim 1, characterized in that said step C comprises a pretreatment, in particular: putting metal into the sulfuric acid solution, wherein the concentration of the solution is 50-100g/L, the soaking time is 1-2 minutes, and the temperature is set to be 20-30 ℃.
5. The method for treating the surface of the metal nano coating according to claim 1, wherein the step D comprises electrochemical electrolysis treatment, specifically, metal is put into a solution with sulfuric acid concentration of 50-100g/L and phosphoric acid of 50-100/L, the current density is set to be 0.03-0.6A/cm 2, and the temperature is controlled to be 30-60 ℃.
6. The method as claimed in claim 1, wherein the step E comprises immersing the nano-coating solution in a concentration of 200ml/L for 1-5 min, and controlling the temperature at 20-40 ℃.
7. The method for treating the surface of a metal nano-coating according to claim 1, wherein in the step F, the metal protection treatment is carried out by soaking the metal with the nano-coating attached on the surface in polyalkenyl phosphate for 1-2 minutes, wherein the temperature is set to be 20-40 ℃ and the concentration of the polyalkenyl phosphate is 30-100 g/L.
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| CN109609955A (en) * | 2019-01-21 | 2019-04-12 | 深圳市纳明特科技发展有限公司 | Magnesium alloy matrix surface T processing method |
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| CN113684510A (en) * | 2021-08-16 | 2021-11-23 | 深圳市纳明特科技发展有限公司 | T treatment method for copper metal surface |
| CN114182320A (en) * | 2021-12-08 | 2022-03-15 | 东莞市润纳实业有限公司 | Zirconium alloy surface treating agent and surface micropore treatment method |
| CN114197026A (en) * | 2021-12-08 | 2022-03-18 | 东莞市润纳实业有限公司 | Zirconium alloy surface treatment process |
| CN114232000B (en) * | 2021-12-16 | 2023-12-26 | 深圳市纳明特科技发展有限公司 | Titanium alloy surface treatment process |
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