CN112647103A - Iron part broken section salt spray test lifting method - Google Patents
Iron part broken section salt spray test lifting method Download PDFInfo
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- CN112647103A CN112647103A CN202011500125.2A CN202011500125A CN112647103A CN 112647103 A CN112647103 A CN 112647103A CN 202011500125 A CN202011500125 A CN 202011500125A CN 112647103 A CN112647103 A CN 112647103A
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- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 201
- 150000003839 salts Chemical class 0.000 title claims abstract description 21
- 239000007921 spray Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052742 iron Inorganic materials 0.000 claims abstract description 76
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 44
- 238000007747 plating Methods 0.000 claims abstract description 35
- 238000009713 electroplating Methods 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000003223 protective agent Substances 0.000 claims abstract description 16
- 230000003213 activating effect Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 150000002505 iron Chemical class 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 3
- 229940116298 l- malic acid Drugs 0.000 claims description 3
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 3
- 239000001632 sodium acetate Substances 0.000 claims description 3
- 235000017281 sodium acetate Nutrition 0.000 claims description 3
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 3
- 239000001384 succinic acid Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Images
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1655—Process features
- C23C18/1664—Process features with additional means during the plating process
- C23C18/1666—Ultrasonics
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
- C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
- C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
-
- 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
- C25D5/20—Electroplating using ultrasonics, vibrations
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemically Coating (AREA)
Abstract
The invention discloses a salt spray test lifting method for a broken section of an iron part, comprising the following steps of S1, deoiling the iron part; s3, activating the iron piece; s5, grinding the iron piece; s6, electroplating the iron piece; s7, carrying out chemical plating on the iron piece; and S8, treating the iron part product by using a protective agent. The invention has the beneficial effects that: the process is simplified, the salt spray resistance test performance of the iron part product is improved, and the nickel plating quality of the iron part product is improved.
Description
Technical Field
The invention relates to a salt spray test improvement method for a broken section of an iron part.
Background
After the iron part is punched and formed by the stamping die, a plurality of grooves (3) are formed in the broken section (2) of the iron part (1), and the structural schematic diagram of the punched iron part is shown in figures 1-2, wherein the forming reason of the grooves (3) is that punching force exists between the male die and the iron part (1). The process requires that the iron piece (1) is subjected to electroplating and chemical plating treatment to form a nickel plating layer on the surface of the iron piece (1), an iron piece product is obtained after the nickel plating layer is plated, and the iron piece product is subjected to a salt spray test. The nickel plating process comprises the steps of firstly immersing the iron piece (1) into an electroplating solution to form a nickel plating layer on the surface of the iron piece (1), then cleaning the iron piece (1), immersing the cleaned iron piece into the nickel plating solution to plate a chemical nickel layer on the nickel plating layer, and finally cleaning the iron piece to obtain an iron piece product.
After the salt spray test is carried out on an iron part product, the iron part product is found to be rusted quickly at the position of the section (2), the main reason for quick rusting is that a plurality of grooves (3) are formed in the position of the section (2), the grooves (3) have a certain depth, when electroplating is carried out, current cannot be immersed into the depth of the grooves (3), and further an electroplated nickel layer (4) is electroplated on the side wall of the upper half part of the grooves (3), while the electroplated nickel layer is not electroplated on the side wall of the lower half part of the grooves (3) as shown in figure 3, and finally the iron part material in the grooves (3) is completely exposed outside, so that the iron part product is corroded quickly at the position; when carrying out the chemical plating, because slot (3) have certain degree of depth, and be formed with the bubble at the opening part of slot (3), lead to nickel plating solution can't flow in slot (3), and then lead to the first half lateral wall of slot (3) to plate the chemical nickel layer, and do not plate the chemical nickel layer on the latter half lateral wall of slot (3), finally cause the ironware material in slot (3) to expose completely outside, and then lead to corroding very fast in this department to the resistant salt spray test performance of ironware product has been reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the iron piece broken section salt spray test improving method which simplifies the process, improves the salt spray resistance test performance of the iron piece product and improves the nickel plating quality of the iron piece product.
The purpose of the invention is realized by the following technical scheme: a method for improving a salt spray test of a broken section of an iron part comprises the following steps:
s1, grinding the iron piece: performing barreling on the broken section of the iron piece by adopting barreling to reduce the height of the groove on the broken section;
s2, deoiling of iron pieces: immersing an iron piece into alkali liquor, introducing ultrasonic waves into the alkali liquor, removing oil stains attached to the surface of the iron piece under the combined action of the alkali liquor and the ultrasonic waves, and removing oil from the iron piece after a period of oil removal;
s3, taking the deoiled iron piece out of the alkaline washing tank, and washing off alkaline liquor on the surface of the iron piece by using clear water;
s4, activating iron pieces: immersing the iron piece into a hydrochloric acid solution, removing an oxide layer on the surface of the iron piece by using hydrochloric acid, and activating the iron piece after activating for a period of time;
s5, taking the activated iron piece out of the hydrochloric acid solution, and washing away the hydrochloric acid solution on the surface of the iron piece by using clear water;
s6, electroplating iron piece: immersing the activated iron piece into an electroplating solution, introducing current into the electroplating solution, introducing ultrasonic waves into the electroplating solution, introducing the electroplating solution and the current into the bottom of the groove under the combined action of the current and the ultrasonic waves, so as to electroplate a layer of electroplated nickel layer on the inner side wall of the groove, and taking the iron piece out of the electroplating solution after electroplating for a period of time, thereby realizing the electroplating of the iron piece;
s7, and an iron piece chemical plating process: cleaning an iron piece, immersing the iron piece into a nickel plating solution after cleaning, and simultaneously enabling the nickel plating solution to flow into the bottom of the groove under the action of ultrasonic waves, so that a chemical nickel layer is plated on the electroplated nickel layer, and the chemical plating of the iron piece is realized; after nickel plating for a period of time, taking the obtained iron part product out of the nickel plating solution;
s8, treating the iron part product by using a protective agent: cleaning the iron part product in the step S7, immersing the iron part product into a protective agent after cleaning, introducing ultrasonic waves into the protective agent, and allowing the protective agent to flow into the groove under the action of the ultrasonic waves to form a layer of water-based protective film on the surface of the iron part product;
and S9, washing and drying the iron part product treated by the protective agent, and performing a salt spray test on the iron part product after drying.
In the step S7, the nickel plating solution is composed of 27-30 g/L nickel sulfate, 28-30 g/L sodium hypophosphite, 20-25 g/L sodium acetate, 20-22 g/L malic acid and 15g/L succinic acid.
The invention has the following advantages: the invention simplifies the process, improves the salt spray resistance test performance of the iron part product and improves the nickel plating quality of the iron part product.
Drawings
FIG. 1 is a schematic structural view of a blanked iron part;
FIG. 2 is an enlarged schematic view of a trench;
FIG. 3 is a schematic view of an iron part after being electroplated;
FIG. 4 is a schematic structural view of a ferrous object product produced by the present invention;
FIG. 5 is an enlarged view of part I of FIG. 4;
in the figure, 1-iron part, 2-section, 3-groove, 4-electroplated nickel layer, 5-chemical nickel layer and 6-aqueous protective film.
Detailed Description
The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:
a method for improving a salt spray test of a broken section of an iron part comprises the following steps:
s1, grinding the iron piece: the method comprises the following steps of (1) performing barreling on a broken section 2 of an iron piece 1 by adopting barreling to reduce the height of a groove 3 on the broken section 2;
s2, deoiling of iron pieces: immersing the iron piece 1 into alkali liquor, introducing ultrasonic waves into the alkali liquor, removing oil stains attached to the surface of the iron piece 1 under the combined action of the alkali liquor and the ultrasonic waves, and removing oil of the iron piece after a period of oil removal;
s3, taking the deoiled iron part 1 out of the alkaline washing tank, and washing off alkaline liquor on the surface of the iron part 1 by using clear water;
s4, activating iron pieces: immersing the iron piece 1 into a hydrochloric acid solution, removing an oxide layer on the surface of the iron piece 1 by using hydrochloric acid, and activating the iron piece after activating for a period of time;
s5, taking the activated iron piece 1 out of the hydrochloric acid solution, and washing away the hydrochloric acid solution on the surface of the iron piece 1 by using clear water;
s6, electroplating iron piece: immersing the activated iron piece 1 into an electroplating solution, introducing current into the electroplating solution, introducing ultrasonic waves into the electroplating solution, introducing the electroplating solution and the current into the bottom of the groove 3 under the combined action of the current and the ultrasonic waves, so as to electroplate a layer of electroplated nickel layer 4 on the inner side wall of the groove 3 as shown in figures 4-5, and taking the iron piece 1 out of the electroplating solution after electroplating for a period of time, thereby realizing electroplating of the iron piece; because the depth of the groove 3 is reduced and the electroplating solution can flow into the lower half part of the groove 3 by ultrasonic waves, the inner side wall of the groove 3 is completely electroplated, the iron part material in the groove 3 is prevented from being exposed to the outside, and the salt spray test performance is greatly improved;
s7, and an iron piece chemical plating process: cleaning the iron piece 1, immersing the iron piece into a nickel plating solution after cleaning, and enabling the nickel plating solution to flow into the bottom of the groove 3 under the action of ultrasonic waves, so that a chemical nickel layer 5 is plated on the electroplated nickel layer 4 as shown in figures 4-5, and chemical plating of the iron piece is realized; after nickel plating for a period of time, taking the obtained iron part product out of the nickel plating solution; because the depth of the groove 3 is reduced, the ultrasonic wave eliminates air bubbles at the opening of the groove 3, and the nickel plating solution can circularly flow into the groove 3, the chemical nickel layer 5 covers the electroplated nickel layer 4, the iron piece material in the groove 3 is prevented from being exposed to the outside, and the salt spray test performance is greatly improved;
s8, treating the iron part product by using a protective agent: cleaning the iron part product in the step S7, immersing the iron part product into a protective agent after cleaning, introducing ultrasonic waves into the protective agent, and allowing the protective agent to flow into the groove 3 under the action of the ultrasonic waves to form a layer of water-based protective film 6 on the surface of the iron part product as shown in FIGS. 4-5; the water-based protective film 6 isolates the contact between the coating and air, prevents iron parts from being oxidized, and further improves the salt spray test performance;
and S9, washing and drying the iron part product treated by the protective agent, and performing a salt spray test on the iron part product after drying.
In the step S7, the nickel plating solution is composed of 27-30 g/L nickel sulfate, 28-30 g/L sodium hypophosphite, 20-25 g/L sodium acetate, 20-22 g/L malic acid and 15g/L succinic acid.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method for improving a salt spray test of a broken section of an iron part is characterized by comprising the following steps: it comprises the following steps:
s1, grinding the iron piece: the method comprises the following steps of (1) performing barreling on a broken section (2) of an iron piece (1) by adopting barreling to reduce the height of a groove (3) on the broken section (2);
s2, deoiling of iron pieces: immersing the iron piece (1) into alkali liquor, introducing ultrasonic waves into the alkali liquor, removing oil stains attached to the surface of the iron piece (1) under the combined action of the alkali liquor and the ultrasonic waves, and removing oil of the iron piece after a period of oil removal;
s3, taking the deoiled iron piece (1) out of the alkaline washing tank, and washing off alkaline liquor on the surface of the iron piece (1) by using clean water;
s4, activating iron pieces: immersing the iron piece (1) into a hydrochloric acid solution, removing an oxide layer on the surface of the iron piece (1) by using hydrochloric acid, and activating the iron piece after activating for a period of time;
s5, taking the activated iron piece (1) out of the hydrochloric acid solution, and washing away the hydrochloric acid solution on the surface of the iron piece (1) by using clear water;
s6, electroplating iron piece: immersing the activated iron piece (1) into an electroplating solution, introducing current into the electroplating solution, introducing ultrasonic waves into the electroplating solution, introducing the electroplating solution and the current into the bottom of the groove (3) under the combined action of the current and the ultrasonic waves, so as to electroplate a layer of electroplated nickel layer (4) on the inner side wall of the groove (3), and taking the iron piece (1) out of the electroplating solution after electroplating for a period of time, thereby realizing the electroplating of the iron piece;
s7, and an iron piece chemical plating process: cleaning the iron piece (1), immersing the iron piece into a nickel plating solution after cleaning, and simultaneously enabling the nickel plating solution to flow into the bottom of the groove (3) under the action of ultrasonic waves, so that a chemical nickel layer (5) is plated on the electroplated nickel layer (4), and chemical plating of the iron piece is realized; after nickel plating for a period of time, taking the obtained iron part product out of the nickel plating solution;
s8, treating the iron part product by using a protective agent: cleaning the iron part product in the step S7, immersing the iron part product into a protective agent after cleaning, introducing ultrasonic waves into the protective agent, and allowing the protective agent to flow into the groove (3) under the action of the ultrasonic waves to form a layer of water-based protective film (6) on the surface of the iron part product;
and S9, washing and drying the iron part product treated by the protective agent, and performing a salt spray test on the iron part product after drying.
2. The method for improving the salt spray test of the broken section of the iron part according to claim 1, characterized by comprising the following steps: in the step S7, the nickel plating solution is composed of 27-30 g/L nickel sulfate, 28-30 g/L sodium hypophosphite, 20-25 g/L sodium acetate, 20-22 g/L malic acid and 15g/L succinic acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011500125.2A CN112647103A (en) | 2020-12-18 | 2020-12-18 | Iron part broken section salt spray test lifting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011500125.2A CN112647103A (en) | 2020-12-18 | 2020-12-18 | Iron part broken section salt spray test lifting method |
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| CN112647103A true CN112647103A (en) | 2021-04-13 |
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| CN202011500125.2A Pending CN112647103A (en) | 2020-12-18 | 2020-12-18 | Iron part broken section salt spray test lifting method |
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| EP1022770A2 (en) * | 1999-01-22 | 2000-07-26 | Sony Corporation | Method and apparatus for plating and plating structure |
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2020
- 2020-12-18 CN CN202011500125.2A patent/CN112647103A/en active Pending
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| Title |
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