CN112030170A - Nickel-plated piece yellow film treatment method - Google Patents
Nickel-plated piece yellow film treatment method Download PDFInfo
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- CN112030170A CN112030170A CN202010732483.XA CN202010732483A CN112030170A CN 112030170 A CN112030170 A CN 112030170A CN 202010732483 A CN202010732483 A CN 202010732483A CN 112030170 A CN112030170 A CN 112030170A
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- 238000000034 method Methods 0.000 title claims abstract description 73
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000002253 acid Substances 0.000 claims abstract description 45
- 230000001590 oxidative effect Effects 0.000 claims abstract description 43
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 50
- 238000002791 soaking Methods 0.000 claims description 29
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 28
- 229910052759 nickel Inorganic materials 0.000 claims description 25
- 238000007654 immersion Methods 0.000 claims description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 claims description 9
- 229940005991 chloric acid Drugs 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 24
- 238000007747 plating Methods 0.000 description 23
- 239000010410 layer Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 10
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 10
- 239000012535 impurity Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000036632 reaction speed Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 150000005837 radical ions Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical class OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to the technical field of surface treatment of nickel-plated parts, and particularly discloses a method for treating a yellow film of a nickel-plated part, which comprises the following steps: the method comprises the following steps: weighing 30-100 parts by weight of chromic anhydride, and dissolving in 1000 parts by weight of water to form a chromic anhydride solution; step two: adjusting the pH value of the chromic anhydride solution in the step one to 0.5-2.0 by using strong oxidizing acid to obtain a treatment solution; step three: immersing the nickel-plated piece in the treatment solution in the second step for 3-10s, taking out the nickel-plated piece, and washing; step four: and (4) drying the nickel-plated piece obtained in the third step. The treatment method has the advantage of quickly removing the yellow film on the surface of the nickel-plated part.
Description
Technical Field
The invention relates to the technical field of surface treatment of nickel-plated parts, in particular to a method for treating a yellow film of a nickel-plated part.
Background
The process of plating metals or certain non-metals with a layer of nickel by electrolytic or chemical means is known as nickel plating. The nickel plating on the workpiece can lead the workpiece to have excellent corrosion resistance, wear resistance, weldability, higher microhardness and good appearance, thereby being commonly used as a protective, decorative or functional plating layer to meet the use requirement of the workpiece and prolong the service life of the workpiece.
In actual processing, if the nickel plating solution contains organic impurities, the environment humidity for storing parts is too high, or the parts are not washed cleanly after nickel plating, and other factors, a yellow film is generated on the surface of a nickel-plated part, so that the appearance of the product is greatly influenced. The currently common treatment methods for such yellow films are: for example, 5% -10% hydrochloric acid or sulfuric acid is used for soaking treatment, or oxalic acid series solution is used for heating and soaking treatment, but the treatment efficiency and treatment effect of the above treatment methods are not ideal, and even the yellow film on the surface of a nickel-plated piece cannot be completely removed, and only deplating treatment can be carried out.
Therefore, it is required to develop a treatment method capable of rapidly removing the yellow film on the surface of the nickel-plated article.
Disclosure of Invention
Aiming at the problems of low treatment efficiency and poor effect of the yellow film on the surface of the nickel-plated piece in the prior art, the invention aims to provide the method for treating the yellow film on the surface of the nickel-plated piece, which has the advantage of being capable of quickly removing yellow spots or the yellow film on the surface of the nickel-plated piece.
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating a yellow film of a nickel-plated part comprises the following steps:
the method comprises the following steps: weighing 30-100 parts by weight of chromic anhydride, and dissolving in 1000 parts by weight of water to form a chromic anhydride solution;
step two: adjusting the pH value of the chromic anhydride solution in the step one to 0.5-2.0 by using strong oxidizing acid to obtain a treatment solution;
step three: immersing the nickel-plated piece in the treatment solution obtained in the second step for 3-10s, taking out the nickel-plated piece, and washing;
step four: and (4) drying the nickel-plated piece obtained in the third step.
Through adopting above-mentioned technical scheme, adopt chromic anhydride and oxidability strong acid configuration treatment solution, chromic anhydride can obtain chromic acid after dissolving in water, chromic acid shows strong oxidizing property under strong acid condition, simultaneously, oxidability strong acid also can provide certain oxidizing power, make the treatment solution have strong acid and strong oxidizing property simultaneously concurrently, the nickel plating spare that will cover the yellow film soaks in the treatment solution, the yellow film on the nickel plating spare receives the combined action of oxidation and acid corrosion simultaneously and is driven fast, the treatment effeciency is high, the treatment effect is good. In addition, the nickel coating has stronger capacity of resisting chromic acid oxidation, namely the reaction speed of the nickel coating and chromic acid is slow, and the processing speed is extremely high when the prepared processing solution is used for processing the yellow film, so the processing solution has small influence on the nickel coating, the quality of the nickel plated part after the yellow film is removed is close to the quality of a normal nickel plated part, and the nickel plated part after the yellow film is removed can be normally used.
The method comprises the following steps of (1) adjusting the pH of a chromic anhydride solution by using an oxidizing strong acid, wherein the strong acid is used for obtaining the addition amount of the acid through calculation so as to be convenient for adjusting and controlling the pH of the chromic anhydride solution, and reducing the addition amount of the acid, reducing the amount of impurities introduced into a treatment solution in the pH adjusting process and ensuring the quality of the treatment solution; the oxidizing acid is used to prevent chromic acid from oxidizing acid radical ions, so that the stability of the treatment liquid is ensured, and the use effect of the treatment liquid is ensured.
Further, the strong oxidizing acid is at least one of concentrated sulfuric acid, nitric acid, or chloric acid.
By adopting the technical scheme, at least one of concentrated sulfuric acid, nitric acid or chloric acid is used as strong oxidizing acid, the oxidizing properties of the concentrated sulfuric acid, the nitric acid and the chloric acid are similar, and the oxidizing properties are smaller than the oxidizing properties of chromic acid, so that when a yellow film on a nickel-plated part is removed, the yellow film is mainly oxidized by chromate, that is, on the basis that the yellow film can be rapidly removed by a treatment solution, the possibility of excessive erosion of the coating of the nickel-plated part due to the excessively strong oxidizing property of the treatment solution is reduced, the difference between the nickel-plated part with the yellow film removed and a normal nickel-plated part is reduced, and the quality of the nickel-plated part after treatment is ensured; on the other hand, after the concentrated sulfuric acid, the nitric acid and the chloric acid are subjected to redox reaction, solid reduction products cannot be generated, the possibility of separating out solid impurities in the use process of the treatment solution is reduced, the possibility of the impurities separated out from the treatment solution on the surface of the nickel-plated part is further reduced, the surface cleanness of the nickel-plated part is ensured, and the treatment quality is improved.
Further, the oxidizing strong acid is concentrated sulfuric acid, and the purity grade of the concentrated sulfuric acid is analytical grade.
By adopting the technical scheme, the concentrated sulfuric acid is used as the strong oxidizing acid, so that the treatment solution obtained by adjusting the pH value by the concentrated sulfuric acid has strong stability, stable treatment effect and convenient control; in addition, the analytically pure concentrated sulfuric acid has high purity, less impurities are introduced into the chromic anhydride solution when the pH value of the solution is adjusted, and the obtained treatment liquid has high quality and is convenient to produce and use.
Further, in the second step, the pH value of the chromic anhydride solution in the first step is adjusted to 1.0-1.5 by using strong oxidizing acid.
By adopting the technical scheme, the pH value of the chromic anhydride solution is adjusted to 1.0-1.5, and on the premise of ensuring the treatment quality and treatment effect of the yellow film, the acid corrosion of the nickel coating layer when the nickel-plated piece is soaked is weakened, so that the influence of the yellow film treatment process on the nickel coating layer is reduced, and the influence of the yellow film treatment on the quality of the nickel-plated piece is favorably reduced.
Further, in the first step, 50-80 parts by weight of chromic anhydride is weighed.
By adopting the technical scheme, the treatment solution prepared by 50-80 parts by weight of chromic anhydride can quickly oxidize a yellow film on the surface of a nickel-plated piece when the nickel-plated piece is treated, the treatment efficiency is high, the influence on a nickel coating is small, the influence of the treatment solution on the nickel-plated layer is reduced while the yellow film of the nickel-plated piece is quickly treated, and the treatment effect is good.
Further, in the third step, when the nickel-plated piece is immersed in the treatment solution in the second step, the nickel-plated piece is turned over.
By adopting the technical scheme, the nickel-plated piece is turned in the soaking process of the nickel-plated piece, so that the treatment solution can be fully contacted with the whole nickel-plated piece, the yellow film on the surface of the nickel-plated piece is removed, and the treatment quality is improved.
Further, in the third step, the soaking temperature of the nickel plating piece is 15-20 ℃.
By adopting the technical scheme, the reaction speed of the treatment solution and the nickel-plated piece is slowed down by the adopted soaking temperature, the corrosion speed of the treatment solution to the nickel-plated piece is reduced on the premise of ensuring the treatment effect of the yellow film on the nickel-plated piece, and the influence of the yellow film treatment on the quality of the nickel-plated piece is reduced.
Further, in the third step, after the nickel-plated piece is soaked in the treatment solution for 3-5s, the nickel-plated piece is taken out and washed clean; sorting the nickel-plated parts still attached with the yellow films, soaking for 3-5s for the second time, taking out the nickel-plated parts, and washing cleanly.
By adopting the technical scheme, the yellow film on the nickel-plated part with the lighter yellow film covering condition is completely removed by adopting primary soaking, then the nickel-plated part with the yellow film removed is selected, the nickel-plated part with the yellow film not completely removed is soaked for the second time, the yellow film on the nickel-plated part is removed, and on the basis of fully removing the yellow film on the nickel-plated part, the soaking time of the nickel-plated part with the lighter yellow film covering condition in the treatment solution is reduced by graded soaking, and the influence of the treatment solution on the nickel-plated layer is reduced.
In conclusion, the invention has the following beneficial effects:
firstly, the treatment solution is prepared from chromic anhydride and strong oxidizing acid to treat a nickel-plated part coated with a yellow film, chromic anhydride can obtain chromic acid after being dissolved in water, the chromic acid shows strong oxidizing property under the strong acid condition, meanwhile, the strong oxidizing acid can provide certain oxidizing capacity, so that the treatment solution has both acidity and oxidizing property, the nickel-plated part coated with the yellow film is soaked in the treatment solution, and the yellow film on the nickel-plated part is subjected to combined action of oxidation and acid corrosion simultaneously, so that the nickel-plated part is rapidly removed, the treatment efficiency is high, and the treatment effect is good.
Secondly, concentrated sulfuric acid is preferably adopted as the strong oxidizing acid, and the treatment liquid obtained by adjusting the pH value by the concentrated sulfuric acid has strong stability, stable treatment effect and convenient control; in addition, the analytically pure concentrated sulfuric acid has high purity, less impurities are introduced into the chromic anhydride solution when the pH value of the solution is adjusted, and the obtained treatment liquid has high quality and is convenient to produce and use.
Thirdly, the reaction speed of the treatment solution and the nickel-plated piece is slowed down by adopting the soaking temperature, the corrosion speed of the treatment solution to the nickel-plated layer of the nickel-plated piece is reduced on the premise of ensuring the treatment effect of the yellow film on the nickel-plated piece, and the influence of the treatment of the yellow film on the quality of the nickel-plated piece is reduced.
Detailed Description
The content of the present application is further illustrated below with reference to examples.
The chromic anhydride in the application adopts industrial chromic anhydride of Chongqing folk Toyobo chemical industry, and the concentrated sulfuric acid, the nitric acid, the chloric acid, the hydrochloric acid and the hydrofluoric acid in the application are all from Nanjing chemical reagent company Limited.
Examples
Example 1
A method for treating a yellow film of a nickel-plated part comprises the following steps:
the method comprises the following steps: pouring 100kg of tap water into a plastic tank, weighing 8kg of chromic anhydride, adding the chromic anhydride into the tap water, and stirring until the chromic anhydride is dissolved to form a chromic anhydride solution;
step two: adding oxidizing strong acid into the chromic anhydride solution obtained in the first step, stirring while adding the oxidizing strong acid, and adjusting the pH value of the chromic anhydride solution obtained in the first step to 1.0 to obtain a treatment solution;
step three: putting the nickel-plated part into a plastic cage, soaking the plastic cage into the treatment solution obtained in the second step for 8s at the soaking temperature of 25 ℃, turning over the plastic cage in the soaking process to drive the nickel-plated part to turn over in the plastic cage, taking out the nickel-plated part after the time is up, and washing the nickel-plated part clean by using tap water;
step four: and (4) drying the nickel-plated part obtained in the third step in an oven to finish the yellow film removing process.
Wherein, the strong oxidizing acid added in the second step and the corresponding mass fraction are shown in table 1.
Examples 2 to 7
The difference between the method for treating the yellow film of the nickel-plated workpiece and the method for treating the yellow film of the nickel-plated workpiece in the second step is that the oxidizing strong acid used in the second step and the corresponding mass fraction are shown in table 1.
TABLE 1 composition and weight percent of strong oxidizing acid in examples 1-7
Example 8
The difference between the method for treating the yellow film of the nickel-plated part and the embodiment 1 is that in the second step, the mass fraction of the added concentrated sulfuric acid is 80 percent.
Example 9
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the first step, the addition amount of chromic anhydride is 3 Kg.
Example 10
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the first step, the addition amount of chromic anhydride is 5 Kg.
Example 11
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the first step, the addition amount of chromic anhydride is 10 Kg.
Example 12
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the second step, the pH value of a chromic anhydride solution in the first step is adjusted to 0.5.
Example 13
The difference between the method for treating the yellow film of the nickel-plated part and the method for treating the yellow film of the nickel-plated part is that in the second step, the pH value of the chromic anhydride solution in the first step is adjusted to 1.5.
Example 14
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the second step, the pH value of a chromic anhydride solution in the first step is adjusted to 2.0.
Example 15
A method for treating a yellow film of a nickel-plated part is different from that of the embodiment 1 in that in the third step, the nickel-plated part is not turned over when being soaked in the step liquid in the second step.
Example 16
The difference between the method for treating the yellow film of the nickel-plated part and the embodiment 1 is that in the third step, the soaking temperature of the nickel-plated part is 20 ℃.
Example 17
The difference between the method for treating the yellow film of the nickel-plated part and the embodiment 1 is that in the third step, the soaking temperature of the nickel-plated part is 15 ℃.
Example 18
The difference between the method for treating the yellow film of the nickel-plated part and the embodiment 1 is that in the third step, the soaking temperature of the nickel-plated part is 10 ℃.
Example 19
A method for treating a yellow film of a nickel-plated part, which is different from the method in the embodiment 1, wherein the soaking time of the nickel-plated part is 3s in the third step.
Example 20
A method for treating a yellow film of a nickel-plated part, which is different from the method in the embodiment 1, wherein the soaking time of the nickel-plated part is 5s in the third step.
Example 21
A method for treating a yellow film of a nickel-plated part, which is different from the method in the embodiment 1, wherein the soaking time of the nickel-plated part is 10s in the third step.
Example 22
A method for treating a yellow film of a nickel-plated part comprises the following steps:
the method comprises the following steps: pouring 100Kg of tap water into a plastic tank, weighing 8Kg of chromic anhydride, adding into the tap water, and stirring until the chromic anhydride is dissolved to form a chromic anhydride solution;
step two: slowly adding 98% concentrated sulfuric acid in mass fraction into the chromic anhydride solution obtained in the first step, stirring while adding, and adjusting the pH value of the chromic anhydride solution obtained in the first step to 1.0 to obtain a treatment solution;
step three: putting the nickel-plated part into a plastic cage, soaking the plastic cage into the treatment solution obtained in the second step for 4s at the soaking temperature of 25 ℃, turning the plastic cage in the soaking process to drive the nickel-plated part to turn in the plastic cage, taking out the nickel-plated part after the reaching time, washing the nickel-plated part with tap water, sorting out the nickel-plated part still attached with the yellow film, putting the nickel-plated part into the plastic cage again for secondary soaking for 4s, and taking out the nickel-plated part after the reaching time;
step four: and (4) drying all the nickel-plated parts obtained in the third step in a drying oven to finish the yellow film removing process.
Comparative example
Comparative example 1
The difference between the method for treating the yellow film of the nickel-plated workpiece and the method for treating the yellow film of the nickel-plated workpiece is that hydrochloric acid with the mass fraction of 36% is used as oxidizing strong acid in the second step.
Comparative example 2
The difference between the method for treating the yellow film of the nickel-plated part and the method for treating the yellow film of the nickel-plated part is that in the second step, oxidizing strong acid which is 57 mass percent hydriodic acid is used.
Comparative example 3
A method for treating a yellow film of a nickel-plated part is different from that of the embodiment 1 in that in the step one, the addition amount of chromic anhydride is 1.5 Kg.
Comparative example 4
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the first step, the addition amount of chromic anhydride is 12 Kg.
Comparative example 5
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the second step, the pH value of a chromic anhydride solution in the first step is adjusted to 0.
Comparative example 6
A method for treating a yellow film of a nickel-plated part is different from that of example 1 in that in the second step, the pH value of a chromic anhydride solution in the first step is adjusted to 3.0.
Comparative example 7
A method for treating a yellow film of a nickel-plated part, which is different from the method in the embodiment 1, wherein the soaking time of the nickel-plated part is 1s in the third step.
Comparative example 8
A method for treating a yellow film of a nickel-plated part, which is different from the method in the embodiment 1, wherein the soaking time of the nickel-plated part is 15s in the third step.
Detection test
The nickel-plated parts coated with the yellow films are treated according to the treatment methods of examples 1 to 22 and comparative examples 1 to 8, and after the treatment is finished, the obtained nickel-plated parts are classified and counted according to a visual evaluation method, and special conditions in the soaking treatment process are recorded, wherein the specific conditions are as follows:
the classification method of the nickel plating piece coated with the yellow film comprises the following steps: 3000 nickel-plated pieces coated with yellow films and processed in the same batch are taken, and are immediately equally divided into 30 samples, each sample comprises 100 nickel-plated pieces, and checking is carried out to ensure that the number of the nickel-plated pieces with similar yellow film coverage degree in each sample is the same.
The visual evaluation grading reference standard is: the brightness of the coating is divided into 0 to 3 grades from low to high, if the yellow spots are covered on the coating, the level is 4, and the level is 5. Wherein, the brightness degree of the nickel plating piece with 3 grades is the same as that of the standard nickel plating piece without being coated with the yellow film.
TABLE 2 grades and proportions of various grades of yellow-film nickel-plated articles treated by methods of examples 1-22 and comparative examples 1-8
By combining examples 1-7 and comparative examples 1-2 and referring to table 2, it can be seen that the treatment solution prepared by using the non-oxidizing strong acid has poor treatment effect on the yellow film on the surface of the nickel-plated part, and the color of the treatment solution is greenish, which indicates that after the non-oxidizing strong acid is added into the chromic anhydride solution, acid radical ions of the non-oxidizing strong acid are oxidized by chromic acid, hexavalent chromium in the chromic acid is reduced to trivalent chromium, so that the oxidation capability of the treatment solution is greatly reduced, and the yellow film on the surface of the nickel-plated part is difficult to be effectively treated. When the oxidizing strong acid is at least one of concentrated sulfuric acid, nitric acid and chloric acid, the yellow film on the surface of the nickel plated part is completely removed, and the influence on the plating layer of the nickel plated part is small, which shows that the treatment solution prepared from chromic anhydride and the oxidizing strong acid has a good treatment effect on the yellow film on the surface of the nickel plated part, namely the treatment solution with both acidity and oxidation can be prepared from chromic anhydride and the oxidizing strong acid, and the treatment solution has stable properties. However, when the treatment solution containing nitric acid and/or chloric acid is used to treat the plated article, the treatment solution containing nitric acid and/or chloric acid corrodes the plated layer of the nickel-plated article relatively severely compared with the treatment method of treating the plated article with the treatment solution containing only concentrated sulfuric acid, which shows that the treatment solution prepared with concentrated sulfuric acid has relatively weak oxidizing property, is mild in treatment of the nickel-plated article, and has little influence on the plated layer of the treated nickel-plated article, so that the treatment solution prepared with concentrated sulfuric acid has a better effect on the treatment of the yellow film of the nickel-plated article.
As can be seen by referring to table 2 in conjunction with examples 1 and 8, the treatment solution prepared by using concentrated sulfuric acid with a lower mass fraction has the same effect on the nickel-plated workpiece as the treatment solution prepared by using concentrated sulfuric acid with a higher mass fraction, but after the treatment solution prepared by using concentrated sulfuric acid with a lower mass fraction is used for treating the individual nickel-plated workpiece, impurities adhere to the surface of the nickel-plated workpiece, which indicates that the concentrated sulfuric acid with a lower mass fraction introduces more impurities into the treatment solution, and the impurities adhere to the surface of the nickel-plated workpiece during the immersion process of the nickel-plated workpiece, so that the quality of the nickel-plated workpiece is affected.
When the addition amount of the chromic anhydride is between 30g/L and 100g/L, especially between 50g/L and 80g/L, the treatment solution can effectively remove the yellow film on the nickel-plated workpiece and has relatively small influence on the plating layer of the nickel-plated workpiece, and the acid corrosion and the oxidation of the treatment solution are kept in a better range, and the treatment solution shows good treatment effect by combining the examples 1, 9, 10 and 11 and the comparative examples 3 and 4 and referring to the table 2. When the addition amount of chromic anhydride is less, such as 15g/L, the oxidizing property of the treatment liquid is poor, and the yellow film on the nickel-plated piece is difficult to remove in a short time; when the addition amount of the chromic anhydride is more, for example, 120g/L, the oxidability of the treatment solution is too strong, and the treatment solution has strong oxidation effect on a yellow film and a plating layer on a nickel-plated piece, so that the plating layer is seriously corroded, and the quality of the plating layer is greatly influenced. Therefore, when preparing the treatment solution, the addition amount of the chromic anhydride is preferably controlled to be between 50g/L and 80 g/L.
When the pH of the treatment solution is between 0.5 and 2.0, particularly between 1.0 and 1.5, it can be seen from the combination of examples 1, 12, 13 and 14 and comparative examples 5 and 6 and referring to table 2 that the treatment solution can effectively remove the yellow film on the nickel-plated article and has relatively small influence on the plating of the nickel-plated article, and the acid corrosiveness and the oxidizing property of the treatment solution are kept in a preferable range, and the treatment solution shows good treatment effect. When the pH value of the treatment solution is lower than 0.5, such as 0, the acid corrosivity of the treatment solution is too strong, and a strong corrosive effect is generated on a yellow film and a plating layer on a nickel-plated piece, so that the plating layer is seriously corroded, and the quality of the plating layer is greatly influenced; when the pH of the treatment liquid is higher than 2.0, for example, 3.0, the treatment liquid is weak in acidity, which makes it difficult to clean the yellow film on the nickel-plated article in a short time. Therefore, when preparing the treatment solution, the pH value is preferably adjusted to 1.0-1.5.
As can be seen by combining examples 1 and 15 and referring to table 2, when the nickel-plated article is not turned over when immersed in the treatment solution, the removal effect of the yellow film of the nickel-plated article is significantly deteriorated, because the nickel-plated articles are overlapped and shielded with each other, so that all parts of the surface of the nickel-plated article are not fully contacted with the treatment solution, and the local yellow film is less corroded by the treatment solution, therefore, when the nickel-plated article is immersed, the nickel-plated article is preferably turned over while being immersed, so that the nickel-plated article is fully contacted with the treatment solution.
By combining the examples 1 and 16-18 and referring to the table 2, it can be seen that when the immersion temperature of the nickel-plated piece in the treatment solution is controlled between 15 ℃ and 20 ℃, the quality of the nickel-plated piece obtained by treatment with the treatment solution is obviously improved, which indicates that when the immersion temperature of the nickel-plated piece is lower, the erosion effect of the immersion solution on the nickel-plated piece is weakened, the effect of immersion in the treatment solution on the plating quality of the nickel-plated piece can be effectively weakened while the yellow film removal effect is ensured, and the treatment effect is improved. When the soaking temperature of the nickel-plated piece is lower than 15 ℃, for example, 10 ℃, the removal of the yellow film on the nickel-plated piece is also influenced, so that the soaking temperature is preferably adjusted to 15-20 ℃ when the nickel-plated piece is soaked in the treatment solution.
As can be seen by referring to Table 2 in combination with examples 1, 19, 20 and 21 and comparative examples 7 and 8, as the immersion time of the nickel-plated article in the treatment solution is prolonged, the erosion of the yellow film and the plating layer on the surface of the nickel-plated article is increased, that is, the quality of the nickel-plated article treated by the treatment solution is gradually reduced, and when the immersion time of the nickel-plated article in the treatment solution is controlled to be 3 to 10s, the overall quality of the resulting nickel-plated article is relatively high, and therefore, when the nickel-plated article is immersed in the treatment solution, the immersion time is preferably controlled to be 3 to 10 s.
It can be seen from the combination of examples 1 and 22 and table 2 that when the ni-plated article is immersed in the treatment solution in several times, that is, after the ni-plated article is taken out after the primary immersion, and then the ni-plated article with the residual yellow film is immersed in the treatment solution in the second time, the ratio of the ni-plated article having the same quality as the standard ni-plated article is significantly increased, and the ratio of the ni-plated article having the quality decreased due to the erosion of the treatment solution is significantly decreased, so that the ni-plated article is preferably immersed in the treatment solution in several times.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A method for treating a yellow film of a nickel-plated part is characterized by comprising the following steps:
the method comprises the following steps: weighing 30-100 parts by weight of chromic anhydride, and dissolving in 1000 parts by weight of water to form a chromic anhydride solution;
step two: adjusting the pH value of the chromic anhydride solution in the step one to 0.5-2.0 by using strong oxidizing acid to obtain a treatment solution;
step three: immersing the nickel-plated piece in the treatment solution in the second step for 3-10s, taking out the nickel-plated piece, and washing;
step four: and (4) drying the nickel-plated piece obtained in the third step.
2. The method of claim 1, wherein said strong oxidizing acid is at least one of concentrated sulfuric acid, nitric acid and chloric acid.
3. The method of claim 2, wherein the strong oxidizing acid is concentrated sulfuric acid, and the purity grade of the concentrated sulfuric acid is analytical grade.
4. The method of claim 1, wherein in the second step, the pH of the chromic anhydride solution in the first step is adjusted to 1.0-1.5 by using an oxidizing strong acid.
5. The method for treating a yellow film of a nickel-plated part according to claim 1, wherein in the first step, 50 to 80 parts by weight of chromic anhydride is weighed.
6. The method for treating a nickel plated workpiece with a yellow film according to claim 1, wherein in the third step, the nickel plated workpiece is turned over while being immersed in the treating solution in the second step.
7. The method for treating a nickel-plated workpiece with a yellow film according to claim 1, wherein in the third step, the immersion temperature of the nickel-plated workpiece is 15-20 ℃.
8. The method for treating the yellow film of the nickel-plated piece according to claim 1, wherein in the third step, the nickel-plated piece is taken out and washed clean after being soaked in the treating solution for 3-5 s; sorting the nickel-plated parts still attached with the yellow films, soaking for 3-5s for the second time, taking out the nickel-plated parts, and washing cleanly.
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