CN117230502B - Surface treatment process for improving condensate water testing performance of metal part - Google Patents
Surface treatment process for improving condensate water testing performance of metal part Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910001868 water Inorganic materials 0.000 title claims abstract description 76
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000004381 surface treatment Methods 0.000 title claims abstract description 26
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- 238000002161 passivation Methods 0.000 claims abstract description 64
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 claims abstract description 53
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- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 16
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- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a surface treatment process for improving the condensate water testing performance of a metal piece, which comprises the following steps of: s1, carrying out an electroplating treatment process on a metal piece to generate a zinc-nickel alloy plating layer; s2, performing a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer; s3, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process comprises the following steps of: immersing the metal piece in a finishing liquid, wherein the finishing liquid comprises a passivated impregnant with the concentration of 100-300 ml/L and a trivalent chromium wetting agent with the concentration of 5-10 ml/L; s4, sealing the metal piece. After the black passivation treatment, a finishing treatment process is carried out, so that the microcrack-shaped surface structure generated by the black passivation is also protected, and the microcrack layer prevents water vapor from penetrating into the base material during the condensate water test, so that the occurrence time of the condensate water test red rust is prolonged, and the corrosion resistance of the metal piece is effectively improved.
Description
Technical Field
The invention relates to a surface treatment process, in particular to a surface treatment process for improving the condensate water testing performance of a metal piece.
Background
The electro-plating of zinc and zinc-nickel on the surface of a metal fastener is a very common metal corrosion prevention process, and particularly, the electro-plating of zinc-nickel alloy on the surface of the metal can provide better corrosion resistance.
The condensed water test is a performance test of the corrosion resistance of a metal fastener, and is carried out according to the ISO 6270-2 standard, and the result evaluation is carried out according to the occurrence time of red rust.
When the fastener is subjected to neutral salt spray test, the test result of the zinc-nickel coating is obviously superior to that of the zinc coating, and the zinc-nickel alloy coating is more and more commonly applied due to high cost performance. In general, to increase the corrosion resistance of the plating, to increase the decoration, controlling the friction coefficient of the fastener to 0.12-0.18 (the control range of most host factories), a chromium-containing conversion layer (i.e., passivation layer) and a sealing layer are added after zinc-nickel plating. In addition, the color of the passivation layer may vary depending on the composition of the bath solution, and the product having a black appearance is called black passivation.
Although the fastener can meet the requirement of decorative effect after the zinc-nickel alloy black passivation treatment, in practical application, if the fastener is treated according to the traditional zinc-nickel alloy surface treatment process (pretreatment-electrogalvanized nickel-weak acid activation-black passivation-sealing-drying), red rust can appear in 72 hours and even 24 hours after the condensate water test according to the ISO 6270-2 method, and the condensate water test performance requirement of 240 hours without red rust can not be met.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a surface treatment process for improving the condensate water testing performance of a metal piece, and the time for the occurrence of the condensate water testing red rust is delayed by adding a finishing treatment process, so that the condensate water testing performance requirement of 240 hours without the red rust is met.
In order to achieve the above purpose, the invention adopts the following technical scheme: a surface treatment process for improving the condensate water test performance of a metal piece comprises the following steps:
s1, carrying out an electroplating treatment process on a metal piece to generate a zinc-nickel alloy plating layer;
s2, performing a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer;
s3, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process comprises the following steps of: soaking the metal piece in a finishing liquid, wherein the finishing liquid comprises a passivated dip with the concentration of 100-300 ml/L and a trivalent chromium wetting agent with the concentration of 5-10 ml/L, and drying the metal piece after S3; illustratively, the concentration of the post-passivation infusion is 100ml/L, 125ml/L, 150ml/L, 175ml/L, 200ml/L, 225ml/L, 250ml/L, 275ml/L, 300ml/L; the concentration of the trivalent chromium wetting agent is 5ml/L, 6ml/L, 7ml/L, 8ml/L, 9ml/L and 10ml/L;
S4, sealing the metal piece;
s5, drying the metal piece.
Further, in S3, the metal piece is soaked in the finishing liquid for 10-60 seconds. Exemplary times for the metal pieces to be immersed in the finish are 10 seconds, 20 seconds, 30 seconds, 40 seconds, 50 seconds, 60 seconds.
Further, in S3, the pH of the finishing liquid is 4.0-4.5, and the temperature is 45-55 ℃.
Further, in S3, the method further includes the following steps: and (3) placing the metal piece in a centrifugal machine to spin for 60-90 seconds, wherein the rotating speed of the centrifugal machine is 400-600 RPM.
Further, in S1, the electroplating treatment process includes the steps of:
s11, adding NaOH, water and zinc concentrate into the electroplating bath, wherein the concentration of the NaOH is 120-140 g/L, and the concentration of the zinc concentrate is 90-130 ml/L; illustratively, the concentration of NaOH is 120g/L, 125g/L, 130g/L, 135g/L, 140g/L; the concentration of the zinc concentrate is 90ml/L, 100ml/L, 110ml/L, 120ml/L and 130ml/L. The zinc concentrate is a solution containing 75g/L zinc and 330g/L sodium hydroxide;
s12, adding an alkaline zinc-nickel electroplating working solution into the electroplating bath, wherein the alkaline zinc-nickel electroplating working solution comprises a nickel complexing agent, a zinc complexing agent, a nickel extender and a brightening agent; wherein the concentration of the nickel complexing agent is 60-70 ml/L, the concentration of the zinc complexing agent is 60-70 ml/L, the concentration of the nickel extender is 7-15 ml/L, and the concentration of the brightening agent is 0.3-0.8 ml/L. In the application, a nickel complexing agent, a zinc complexing agent, a nickel extender and a brightening agent are purchased from MaideMeilex technology (Suzhou) limited, and the model of the nickel complexing agent is Performia 285R Base; the model of the zinc complexing agent is a Performa 285R Starter; the model of the brightening agent is Performa285; the nickel supplement is a mixed solution of 7-10 ml/L of a model of Performa285 Ni-CPL, 1-3 ml/L of a model of Performa285 Additive H and 2-5 ml/L of a model of Performa 285R Additive;
S13, placing the metal piece into a plating bath, and switching on the current of 0.5-0.8 ASD to plate the metal piece, thereby forming a zinc-nickel alloy plating layer on the metal surface.
Further, in S2, the black passivation process includes the following steps: adding passivation solution and water into the passivation tank to prepare zinc-nickel black passivation working solution, wherein the concentration of the passivation solution is 250-330 ml/L, and the pH value of the prepared zinc-nickel black passivation working solution is 1.9-2.3. In the application, the passivation solution is purchased from MaideMezle technology (Suzhou) limited company, and the passivation solution is a mixed solution with the model of Finidip 728.5 Part A and the model of Finidip 728.5 Part B, wherein the concentration of Finidip 728.5 Part A is 150-180ml/L, and the concentration of Finidip 728.5 Part B is 100-150ml/L.
Further, in S4, the metal piece is put into a sealing additive for sealing treatment, and the concentration of the sealing additive is 80-100%. In this application, the blocking additive was purchased from Yu Maide Melastomas technology (Suzhou) Inc., model Finigard 113G.
Further, the method also comprises the following steps: after the metal piece is sealed, the metal piece is dried at the temperature of 60-80 ℃ for 20-30 min.
Further, the method also comprises a pretreatment process, wherein the pretreatment process comprises chemical degreasing, primary anodic electrolysis, acid washing, secondary anodic electrolysis and presoaking in sequence.
The invention has the beneficial effects that:
1) By adopting the process, after black passivation treatment, a finishing treatment process is carried out, so that the microcrack-shaped surface structure generated by black passivation is also protected, under the synergistic effect of post-sealing and drying, the microcrack layer is prevented from water vapor permeation to the base material during condensate water test, the occurrence time of the condensate water test red rust is further prolonged, no red rust occurs in 240 hours in the experimental process, and the condensate water test performance of the metal fastener is effectively improved, namely the corrosion resistance of the metal piece is effectively improved.
2) The finishing treatment process is a soaking process containing trivalent chromium, so that the appearance of the metal piece is improved on the basis of black passivation while the condensate water testing performance is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a surface treatment process for improving condensate water testing performance of a metal part according to the present invention.
Detailed Description
The following detailed description of the present invention will provide further details in order to make the above-mentioned objects, features and advantages of the present invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Except where shown or otherwise indicated in the operating examples, all numbers expressing quantities of ingredients, physical and chemical properties, and so forth, used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be varied appropriately by those skilled in the art utilizing the desired properties sought to be obtained by the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers subsumed within that range and any range within that range, e.g., 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, 5, and the like.
The applicant found that when the metal piece is treated according to the conventional zinc-nickel alloy surface treatment process (pretreatment-electrogalvanized nickel-weak acid activation-black passivation-sealing-drying), red rust appears in 72 hours or even 24 hours after the condensate water test is carried out according to the ISO 6270-2 method, and the condensate water test performance requirement of 240 hours without red rust cannot be met.
An embodiment of the present invention provides a surface treatment process for improving condensate water testing performance of a metal piece, where the metal piece treated by the process can meet the condensate water testing performance requirement of 240 hours without red rust, and the metal piece is exemplified by a metal fastener, as shown in fig. 1, and specifically includes the following steps:
step one, a pretreatment process: comprises chemical degreasing, primary anodic electrolysis, acid washing, acid activation, secondary anodic electrolysis and presoaking in sequence.
1. The chemical degreasing comprises the following steps:
step 1: adding about 2/3 of tap water into the tank, stirring, slowly adding 50-100 g/L of alkaline degreasing agent (calculated according to the volume of working liquid), and supplementing the liquid level to the working liquid level to obtain chemical degreasing liquid;
step 2: heating to 60-65 ℃;
step 3: placing the metal piece into a roller, keeping the roller to turn over at the speed of 8-10 rpm and soaking in the chemical degreasing liquid for 10-15 min;
Step 4: and (3) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2-3 min.
2. The primary anode electrolysis and the secondary anode electrolysis both comprise the following steps:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 50-100 g/L electrolytic degreasing agent (calculated according to the volume of working liquid), and supplementing the liquid level to the working liquid level to obtain electrolytic degreasing liquid;
step 2: heating to 45-55 ℃;
step 3: the metal piece is put into a roller, the roller is connected with the anode of a direct current rectifier, a conducting plate at the groove side is connected with the cathode of the direct current rectifier, and the roller is kept to overturn at the speed of 8-10 revolutions per minute and is soaked in electrolytic degreasing liquid for 5-10 min;
step 4: removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2-3 min;
3. the pickling in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 36% of industrial concentrated hydrochloric acid and a pickling inhibitor, wherein the concentration of the hydrochloric acid is 200-400 ml/L calculated according to the volume of the working fluid, and the concentration of the pickling inhibitor is 10-30 ml/L, so as to prepare a pickling working fluid according to the method;
step 2: the metal piece is kept in the roller, and the roller is set to overturn at the speed of 8-10 revolutions per minute and is soaked in the pickling working solution for 5-10 min;
Step 3: and (3) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2-3 min.
Among them, the pickling inhibitor is purchased from MaideMeilex technology (Suzhou) Co., ltd., model Picklane 35.
4. The acid activation in the pretreatment process is carried out as follows:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding 36% of analytically pure concentrated hydrochloric acid, wherein the concentration of the hydrochloric acid is 100-200 ml/L calculated according to the volume of the working fluid, and preparing an acid activated working fluid according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to turn over at the speed of 8-10 revolutions per minute and is soaked in the acid activation working solution for 1-2 min;
step 3: and (3) removing the roller, moving the roller into a washing tank, and cleaning the rotary roller in tap water for 2-3 min.
5. The pre-soaking in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding sodium hydroxide, wherein the concentration of the sodium hydroxide is 90-150 g/L calculated according to the volume of the working liquid, and preparing the presoaked working liquid according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to overturn at the speed of 8-10 revolutions per minute and is soaked in the presoaked liquid for 1-2 min;
Step 3: and (3) removing the roller, moving the roller into a washing tank, and cleaning the rotary roller in tap water for 2-3 min.
Step two, carrying out electroplating treatment process on the metal piece to generate a zinc-nickel alloy plating layer, comprising the following steps:
step 1: adding about 1/2 of pure water into the tank, stirring, and slowly adding NaOH and zinc concentrate; the concentration of the zinc concentrate is 90-130 ml/L calculated according to the volume of the working liquid, the concentration of sodium hydroxide in the electroplating solution is controlled at 120-140 g/L, and stirring and cooling are carried out; wherein, the zinc concentration liquid contains 75g/L zinc and 330g/L sodium hydroxide;
step 2: after the temperature is below 30 ℃, 60-70 ml/L of nickel complexing agent Performia 285R Base and 60-70 ml/L of zinc complexing agent Performia 285R Starter are added in sequence, 7-10 ml/L of nickel supplement Performa285 Ni-CPL, 1-3 ml/L of Performa285 Additive H, 2-5 ml/L of Performa 285R Additive and 0.3-0.8 ml/L of brightening agent Performa285 BRIUNIVERSIAL; preparing an alkaline zinc-nickel electroplating working solution according to the method;
step 3: after the cooling temperature is 22-25 ℃, the metal piece enters a plating tank along with a roller, the roller is connected with the negative electrode of a direct current rectifier, an anode plate at the side of the tank is connected with the positive electrode of the direct current rectifier, the roller is kept to overturn at the speed of 6-8 rpm and is soaked in electroplating liquid, and the current of 0.5-0.8 ASD is continuously electrified for 120min;
Step 4: removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in pure water for 2-3 min; the metal part electroplating process is completed;
step 5: the metal piece is removed from the roller used for electroplating, the metal piece to be treated is placed in a gauze, the gauze is placed in subsequent treatment liquid, and the product is turned over through the gauze.
Step three, weak acid light-emitting technology, comprising the following 3 steps:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding citric acid, wherein the concentration of the citric acid is 30-40 g/L calculated according to the volume of the working liquid, and supplementing water to the working liquid level by using pure water; preparing weak acid light-emitting working solution according to the method;
step 2: according to the requirement, placing the electroplated workpiece into a net bag, soaking the workpiece into weak acid light-emitting liquid, and turning over the workpiece through the net bag for 15-30 s;
step 3: and (3) providing the net bag, and cleaning the net bag in pure water for 2-3 min.
Fourthly, carrying out a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer, wherein the method mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, and adding a zinc-nickel black passivation additive while stirring; the zinc-nickel black passivation additive comprises Finidip 728.5 Part A and Finidip 728.5 Part B,Part A with the concentration of 150-180 ml/L calculated according to the volume of working fluid and the concentration of Part B of 100-150 ml/L calculated according to the volume of working fluid;
Step 2: the pH value of the passivation solution is regulated to be 1.9-2.3, and the temperature is controlled to be 18-20 ℃;
step 3: placing the product into black passivation treatment liquid through a gauze, turning over the product through the gauze, and taking out after 30 s;
step 4: and (3) providing the net bag, and cleaning the net bag in pure water for 2-3 min.
Step five, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, adding a passivated infusion and a trivalent chromium wetting agent while stirring, wherein the concentration of the passivated infusion is 100-300 ml/L calculated according to the volume of working solution, and the concentration of the trivalent chromium wetting agent is 5-10 ml/L calculated according to the volume of working solution; preparing finishing liquid according to the method;
step 2: adjusting the pH value of the finishing liquid to 4.0-4.5, and the temperature: 45-55 ℃;
step 3: the fastener after black passivation and water washing of the electroplated zinc-nickel is soaked in finishing liquid through a gauze, and the product is taken out after being turned over for 10-60 s through the gauze;
step 4: and spin-drying the finished workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400-600 RPM, and the spin-drying time is 60-90 seconds, so that the finishing treatment is finished.
Wherein the Post passivation leaches are from the company of environmental protection electroplating technology (Jiangsu) of the family Wen Teya, the model is Post Dip 200, or from the company of the Maidemar technology (Suzhou), the model is Tridip or Tridip CF; trivalent chromium wetting agent is selected from the group consisting of Post Dip 200 Additive B, available from Jiangsu Corp. Wen Teya environmental protection electroplating technology, inc., or Tridip wetter, available from MaideMei technology, inc., suzhou Co., ltd.
Step six, sealing the treatment part, mainly comprising the following 3 steps:
step 1: adding a sealing agent additive into the clean tank, wherein the concentration of the sealing agent additive is 80-100% of the volume of the working fluid, and preparing a sealing working fluid according to the method;
step 2: the product is placed in a closed working solution through a gauze, turned over by the gauze and taken out after 30 s;
step 3: and spin-drying the closed workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400-600 RPM, and the centrifugal time is 60-90 seconds.
Step seven, drying treatment: pouring the metal fastener out of the gauze, placing the gauze in a metal tray for drying at 60-80 ℃ for 20-30 min, and then cooling.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1
A surface treatment process for improving condensate water testing performance of a metal piece, which takes a metal fastener as an example, comprises the following steps:
step one, a pretreatment process: comprises chemical degreasing, primary anodic electrolysis, acid washing, acid activation, secondary anodic electrolysis and presoaking in sequence.
1. The chemical degreasing comprises the following steps:
step 1: adding about 2/3 of tap water into the tank, stirring, slowly adding 50g/L of alkaline degreasing agent (calculated according to the volume of working liquid), and supplementing the liquid to the working liquid level to obtain chemical degreasing liquid;
step 2: heating to 60 ℃;
step 3: placing the metal piece into a roller, keeping the roller to turn over at the speed of 8 revolutions per minute and soaking in the degreasing liquid for 10min;
step 4: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2min.
2. The primary anode electrolysis and the secondary anode electrolysis both comprise the following steps:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 50g/L electrolytic degreasing agent (calculated according to the volume of working liquid), and supplementing the liquid to the working liquid level to obtain electrolytic degreasing liquid;
step 2: heating to 45 ℃;
step 3: the metal piece is put into a roller, the roller is connected with the anode of a direct current rectifier, a conducting plate on the groove side is connected with the cathode of the direct current rectifier, and the roller is kept to overturn at the speed of 8 revolutions per minute and is soaked in electrolytic degreasing liquid for 5min;
Step 4: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2min.
3. The pickling in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 of tap water into a tank, stirring, slowly adding 36% of industrial concentrated hydrochloric acid and a pickling inhibitor, wherein the concentration of the hydrochloric acid is 200ml/L calculated according to the volume of the working solution, and the concentration of the pickling inhibitor is 10 ml/L, so as to prepare a pickling working solution according to the method;
step 2: the metal piece is kept in the roller, and the roller is set to overturn at the speed of 8 revolutions per minute and is soaked in the pickling working solution for 5min;
step 3: and (3) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2-3 min.
4. The acid activation in the pretreatment process is carried out as follows:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding 36% of analytically pure concentrated hydrochloric acid, wherein the concentration of the hydrochloric acid is 100ml/L calculated according to the volume of the working solution, and preparing an acid activated working solution according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to be overturned at the speed of 8 revolutions per minute and is soaked in the acid activation working solution for 1min;
step 3: the drum was removed, transferred into a washing tank, and the drum was rotated and washed in tap water for 2min.
5. The pre-soaking in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding sodium hydroxide, wherein the concentration of the sodium hydroxide is 90g/L calculated according to the volume of the working solution, and preparing the presoaked working solution according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to be overturned at the speed of 8 revolutions per minute and is soaked in the presoaked liquid for 1min;
step 3: and (3) removing the roller, moving the roller into a washing tank, and cleaning the rotary roller in tap water for 2-3 min.
Step two, carrying out electroplating treatment process on the metal piece to generate a zinc-nickel alloy plating layer, comprising the following steps:
step 1: adding about 1/2 of pure water into the tank, stirring, and slowly adding NaOH and zinc concentrate; the concentration of the zinc concentrate is 90ml/L calculated according to the volume of the working solution, the concentration of sodium hydroxide in the electroplating solution is controlled at 120g/L, and stirring and cooling are carried out; wherein, the zinc concentration liquid contains 75g/L zinc and 330g/L sodium hydroxide;
step 2: after the temperature is below 30 ℃, a nickel complexing agent, namely a Performa 285R Base, a zinc complexing agent, namely a Performa 285R Starter, a nickel extender, namely Performa285 Ni-CPL, a Performa285 Additive H,Performa 285R Additive and a brightening agent, namely Performa285 BRIUNIVERSIAL are sequentially added; the alkaline zinc-nickel electroplating working solution is prepared according to the method. In the alkaline zinc-nickel electroplating working solution, the concentration of a zinc complexing agent, namely a Performa 285R Starter, is 60ml/L, the concentration of a nickel supplement, namely a Performa285 Ni-CPL, is 10ml/L, the concentration of Performa285 Additive H is 1ml/L, the concentration of Performa 285R Additive is 2ml/L, and the concentration of a brightening agent, namely Performa285 BRIUNIVERSIAL, is 0.3ml/L;
Step 3: after the cooling temperature reaches 22 ℃, the metal piece enters a plating tank along with a roller, the roller is connected with the negative electrode of a direct current rectifier, an anode plate at the side of the tank is connected with the positive electrode of the direct current rectifier, the roller is kept to overturn at the speed of 6-8 revolutions per minute and is soaked in electroplating liquid, and the current of 0.5ASD is continuously electrified for 120min;
step 4: removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in pure water for 2-3 min; the metal part electroplating process is completed;
step 5: the metal piece is removed from the roller used for electroplating, the metal piece to be treated is placed in a gauze, the gauze is placed in subsequent treatment liquid, and the product is turned over through the gauze.
Step three, weak acid light-emitting technology, comprising the following 3 steps:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding citric acid, wherein the concentration of the citric acid is 40g/L calculated according to the volume of the working liquid, and supplementing water to the working liquid level by using pure water; preparing weak acid light-emitting working solution according to the method;
step 2: according to the requirement, placing the electroplated workpiece into a net bag, soaking the workpiece into weak acid light-emitting liquid, and turning over the workpiece for 30s through the net bag;
step 3: and (3) providing the net bag, and cleaning the net bag in pure water for 2-3 min.
Fourthly, carrying out a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer, wherein the method mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, and adding a zinc-nickel black passivation additive while stirring; the zinc-nickel black passivation additive comprises Finidip 728.5 Part A and Finidip 728.5 Part B,Part A with concentration of 180ml/L calculated by working fluid volume and Part B with concentration of 150ml/L calculated by working fluid volume;
step 2: the pH value of the passivation solution is regulated to 2.0, and the temperature is controlled to 20 ℃;
step 3: placing the product into black passivation treatment liquid through a gauze, turning over the product through the gauze, and taking out after 30 s;
step 4: and (5) providing the net bag, and transferring the net bag into pure water for cleaning for 3min.
Step five, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, adding a passivated infusion and a trivalent chromium wetting agent while stirring, wherein the concentration of the passivated infusion is 100ml/L calculated according to the volume of the working solution, and the concentration of the trivalent chromium wetting agent is 5ml/L calculated according to the volume of the working solution; preparing finishing working solution according to the method;
step 2: adjusting the pH value of the finishing liquid to 4.0 and the temperature to 45 ℃;
Step 3: the fastener after black passivation and water washing of the electroplated zinc-nickel is soaked in finishing liquid through a gauze, and the product is taken out after being turned over for 30 seconds through the gauze;
step 4: and (3) spin-drying the finished workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400RPM, and the spin-drying time is 90 seconds, so that the finishing treatment is finished.
Step six, sealing the treatment part, mainly comprising the following 3 steps:
step 1: adding a sealing agent additive into the clean tank, wherein the concentration of the sealing agent additive is 80 percent calculated according to the volume of the working fluid; preparing a closed working solution according to the method;
step 2: the product is placed in a closed working solution through a gauze, turned over by the gauze and taken out after 30 s;
step 3: and spin-drying the closed workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400RPM, and the centrifugal time is 60 seconds.
Step seven, drying treatment: pouring the metal fastener out of the gauze, placing the gauze in a metal tray for drying at 60 ℃ for 20min, and then cooling.
Example 2
An embodiment of the present invention provides a surface treatment process for improving condensate water testing performance of a metal piece, where the metal piece is exemplified by a metal fastener, and the surface treatment process includes the following steps:
Step one, a pretreatment process: comprises chemical degreasing, primary anodic electrolysis, acid washing, acid activation, secondary anodic electrolysis and presoaking in sequence.
1. The chemical degreasing comprises the following steps:
step 1: adding about 2/3 of tap water into the tank, stirring, slowly adding 100g/L of alkaline degreasing agent (calculated according to the volume of working liquid), and supplementing the liquid to the working liquid level to obtain chemical degreasing liquid;
step 2: heating to 65 ℃;
step 3: placing the metal piece into a roller, keeping the roller to turn over at a speed of 10 revolutions per minute and soaking in the degreasing liquid for 10-15 min;
step 4: and (3) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2-3 min.
2. The primary anode electrolysis and the secondary anode electrolysis both comprise the following steps:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 100g/L electrolytic degreasing agent (calculated according to the volume of the working liquid), and supplementing the liquid to the working liquid level to obtain electrolytic degreasing liquid;
step 2: heating to 55 ℃;
step 3: the metal piece is put into a roller, the roller is connected with the anode of a direct current rectifier, a conducting plate on the groove side is connected with the cathode of the direct current rectifier, and the roller is kept to overturn at the speed of 10 revolutions per minute and is soaked in electrolytic degreasing liquid for 10 minutes;
Step 4: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 3min.
3. The pickling in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 of tap water into a tank, stirring, slowly adding 36% of industrial concentrated hydrochloric acid and a pickling inhibitor, wherein the concentration of the hydrochloric acid is 400ml/L calculated according to the volume of the working solution, and the concentration of the pickling inhibitor is 30ml/L, so as to prepare a pickling working solution according to the method;
step 2: the metal piece is kept in the roller, and the roller is set to overturn at the speed of 10 revolutions per minute and is soaked in the pickling working solution for 10 minutes;
step 3: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 3min.
4. The acid activation in the pretreatment process is carried out as follows:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding 36% of analytically pure concentrated hydrochloric acid, wherein the concentration of the hydrochloric acid is 200ml/L calculated according to the volume of the working solution, and preparing an acid activated working solution according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to be overturned at the speed of 10 revolutions per minute and is soaked in the acid activation working solution for 2 minutes;
step 3: the drum was removed, transferred into a washing tank, and the drum was rotated and washed in tap water for 3min.
5. The pre-soaking in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding sodium hydroxide, wherein the concentration of the sodium hydroxide is 150g/L calculated according to the volume of the working solution, and preparing the presoaked working solution according to the method;
step 2: the metal piece is kept in the roller, and the roller is kept to overturn at the speed of 10 revolutions per minute and is soaked in the presoaked liquid for 1-2 min;
step 3: the drum was removed, transferred into a washing tank, and the drum was rotated and washed in tap water for 3min.
Step two, carrying out electroplating treatment process on the metal piece to generate a zinc-nickel alloy plating layer, comprising the following steps:
step 1: adding about 1/2 of pure water into the tank, stirring, and slowly adding NaOH and zinc concentrate; the concentration of the zinc concentrate is 130ml/L calculated according to the volume of the working solution, the concentration of sodium hydroxide in the electroplating solution is controlled at 140g/L, and stirring and cooling are carried out; wherein, the zinc concentration liquid contains 75g/L zinc and 330g/L sodium hydroxide;
step 2: after the temperature is below 30 ℃, a nickel complexing agent, namely a Performa 285R Base, a zinc complexing agent, namely a Performa 285R Starter, a nickel extender, namely Performa285 Ni-CPL, a Performa285 Additive H,Performa 285R Additive and a brightening agent, namely Performa285 BRIUNIVERSIAL are sequentially added; the alkaline zinc-nickel electroplating working solution is prepared according to the method. In the alkaline zinc-nickel electroplating working solution, the concentration of a zinc complexing agent, namely a Performa 285R Starter, is 70ml/L, the concentration of a nickel supplement, namely a Performa285 Ni-CPL, is 7ml/L, the concentration of Performa285 Additive H is 3ml/L, the concentration of Performa 285R Additive is 5ml/L, and the concentration of a brightening agent, namely Performa285 BRIUNIVERSIAL, is 0.8ml/L;
Step 3: after the cooling temperature reaches 25 ℃, the metal piece enters a plating tank along with a roller, the roller is connected with the negative electrode of a direct current rectifier, an anode plate at the side of the tank is connected with the positive electrode of the direct current rectifier, the roller is kept to overturn at the speed of 8 revolutions per minute and is soaked in electroplating liquid, and the current of 0.5ASD is continuously electrified for 120min;
step 4: removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in pure water for 2-3 min; the metal part electroplating process is completed;
step 5: the metal piece is removed from the roller used for electroplating, the metal piece to be treated is placed in a gauze, the gauze is placed in subsequent treatment liquid, and the product is turned over through the gauze.
Step three, weak acid light-emitting technology, comprising the following 3 steps:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding citric acid, wherein the concentration of the citric acid is 30g/L calculated according to the volume of the working liquid, and supplementing water to the working liquid level by using pure water; preparing weak acid light-emitting working solution according to the method;
step 2: according to the requirement, placing the electroplated workpiece into a net bag, soaking the workpiece into weak acid light-emitting liquid, and turning over the workpiece for 15s through the net bag;
step 3: and (5) providing the net bag, and transferring the net bag into pure water for washing for 2min.
Fourthly, carrying out a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer, wherein the method mainly comprises the following 4 steps:
Step 1: adding 50% pure water into a clean tank, and adding a zinc-nickel black passivation additive while stirring; the zinc-nickel black passivation additive comprises a Finidip 728.5 Part A and a Finidip 728.5 Part B, wherein the concentration of Part A is 150ml/L calculated according to the volume of the working solution, and the concentration of Part B is 100ml/L calculated according to the volume of the working solution;
step 2: the pH value of the passivation solution is regulated to 2.0, and the temperature is controlled to 20 ℃;
step 3: placing the product into black passivation treatment liquid through a gauze, turning over the product through the gauze, and taking out after 30 s;
step 4: and (5) providing the net bag, and transferring the net bag into pure water for cleaning for 3min.
Step five, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, adding a passivated infusion and a trivalent chromium wetting agent while stirring, wherein the concentration of the passivated infusion is 100ml/L calculated according to the volume of the working solution, and the concentration of the trivalent chromium wetting agent is 5ml/L calculated according to the volume of the working solution; preparing finishing working solution according to the method;
step 2: adjusting the pH value of the finishing liquid to be 4.5, and the temperature: 50 ℃;
step 3: the fastener after black passivation and water washing of the electroplated zinc-nickel is soaked in finishing liquid through a gauze, and the product is taken out after being turned over for 30 seconds through the gauze;
Step 4: and (3) spin-drying the finished workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400RPM, and the spin-drying time is 90 seconds, so that the finishing treatment is finished.
Step six, sealing the treatment part, mainly comprising the following 3 steps:
step 1: adding a sealing agent additive into the clean tank, wherein the concentration of the sealing agent additive is 90 percent calculated according to the volume of the working fluid; preparing a closed working solution according to the method;
step 2: the product is placed in a closed working solution through a gauze, turned over by the gauze and taken out after 30 s;
step 3: spin-drying the closed workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 500RPM; the centrifugation time was 60 seconds.
Step seven, drying treatment: pouring the metal fastener out of the gauze, placing the gauze in a metal tray for drying at 80 ℃ for 30min, and then cooling.
Example 3
An embodiment of the present invention provides a surface treatment process for improving condensate water testing performance of a metal piece, where the metal piece is exemplified by a metal fastener, and the surface treatment process includes the following steps:
step one, a pretreatment process: comprises chemical degreasing, primary anodic electrolysis, acid washing, acid activation, secondary anodic electrolysis and presoaking in sequence.
1. The chemical degreasing comprises the following steps:
step 1: adding about 2/3 of tap water into the tank, stirring, slowly adding 80g/L of alkaline degreasing agent (calculated according to the volume of the working liquid), and supplementing the liquid to the working liquid level to obtain chemical degreasing liquid;
step 2: heating to 65 ℃;
step 3: placing the metal piece into a roller, keeping the roller to turn over at the speed of 8 revolutions per minute and soaking in the degreasing liquid for 10min;
step 4: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 3min.
2. The primary anode electrolysis and the secondary anode electrolysis both comprise the following steps:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 80g/L electrolytic degreasing agent (calculated according to the volume of the working liquid), and supplementing the liquid to the working liquid level to obtain electrolytic degreasing liquid;
step 2: heating to 50 ℃;
step 3: the metal piece is put into a roller, the roller is connected with the anode of a direct current rectifier, a conducting plate on the groove side is connected with the cathode of the direct current rectifier, and the roller is kept to overturn at the speed of 10 revolutions per minute and is soaked in electrolytic degreasing liquid for 5min;
step 4: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 3min.
3. The pickling in the pretreatment process is carried out in the following way:
step 1: adding about 2/3 tap water into the tank, stirring, slowly adding 36% industrial grade concentrated hydrochloric acid and pickling inhibitor, wherein the concentration of hydrochloric acid is 300ml/L calculated according to the volume of the working solution, and the concentration of pickling inhibitor is 20ml/L, and preparing the pickling working solution according to the method;
step 2: the metal piece is kept in the roller, and the roller is set to overturn at the speed of 10 revolutions per minute and is soaked in the pickling working solution for 10 minutes;
step 3: and (5) removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in tap water for 2min.
4. The acid activation in the pretreatment process is carried out as follows:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding 36% of analytically pure concentrated hydrochloric acid, wherein the concentration of the hydrochloric acid is 150ml/L calculated according to the volume of the working solution, and preparing an acid activated working solution according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to be overturned at the speed of 8 revolutions per minute and is soaked in the acid activation working solution for 2 minutes;
step 3: the drum was removed, transferred into a washing tank, and the drum was rotated and washed in tap water for 3min.
5. The pre-soaking in the pretreatment process is carried out in the following way:
Step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding sodium hydroxide, wherein the concentration of the sodium hydroxide is 120g/L calculated according to the volume of the working solution, and preparing the presoaked working solution according to the method;
step 2: the metal piece is kept in the roller, the roller is kept to be overturned at the speed of 8 revolutions per minute and is soaked in the presoaked liquid for 2min;
step 3: the drum was removed, transferred into a washing tank, and the drum was rotated and washed in tap water for 3min.
Step two, carrying out electroplating treatment process on the metal piece to generate a zinc-nickel alloy plating layer, comprising the following steps:
step 1: adding about 1/2 of pure water into the tank, stirring, and slowly adding NaOH and zinc concentrate; the concentration of the zinc concentrate is 110ml/L calculated according to the volume of the working solution, the concentration of sodium hydroxide in the electroplating solution is controlled at 130g/L, and stirring and cooling are carried out; wherein, the zinc concentration liquid contains 75g/L zinc and 330g/L sodium hydroxide;
step 2: after the temperature is below 30 ℃, a nickel complexing agent, namely a Performa 285R Base, a zinc complexing agent, namely a Performa 285R Starter, a nickel extender, namely Performa285 Ni-CPL, a Performa285 Additive H,Performa 285R Additive and a brightening agent, namely Performa285 BRIUNIVERSIAL are sequentially added; the alkaline zinc-nickel electroplating working solution is prepared according to the method. In the alkaline zinc-nickel electroplating working solution, the concentration of a zinc complexing agent, namely a Performa 285R Starter, is 65ml/L, the concentration of a nickel supplement, namely a Performa285 Ni-CPL, is 8ml/L, the concentration of Performa285 Additive H is 2ml/L, the concentration of Performa 285R Additive is 2ml/L, and the concentration of a brightening agent, namely Performa285 BRIUNIVERSIAL, is 0.5ml/L;
Step 3: after the cooling temperature reaches 25 ℃, the metal piece enters a plating tank along with a roller, the roller is connected with the negative electrode of a direct current rectifier, an anode plate at the side of the tank is connected with the positive electrode of the direct current rectifier, the roller is kept to overturn at the speed of 8 revolutions per minute and is soaked in electroplating liquid, and the current of 0.5ASD is continuously electrified for 120min;
step 4: removing the roller, moving the roller into a washing tank, and rotating the roller to enable the metal piece to be washed in pure water for 2-3 min; the metal part electroplating process is completed;
step 5: the metal piece is removed from the roller used for electroplating, the metal piece to be treated is placed in a gauze, the gauze is placed in subsequent treatment liquid, and the product is turned over through the gauze.
Step three, weak acid light-emitting technology, comprising the following 3 steps:
step 1: adding about 2/3 of cold tap water into the tank, stirring, slowly adding citric acid, wherein the concentration of the citric acid is 35g/L calculated according to the volume of the working liquid, and supplementing water to the working liquid level by using pure water; preparing weak acid light-emitting working solution according to the method;
step 2: according to the requirements, placing the electroplated workpiece into a net bag, soaking the workpiece into weak acid light-emitting liquid, and turning over the workpiece for 20s through the net bag;
step 3: and (5) providing the net bag, and moving the net bag into pure water for cleaning for 3min.
Fourthly, carrying out a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer, wherein the method mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, and adding a zinc-nickel black passivation additive while stirring; the zinc-nickel black passivation additive comprises a Finidip 728.5 Part A and a Finidip 728.5 Part B, wherein the concentration of Part A is 150ml/L calculated according to the volume of the working solution, and the concentration of Part B is 100ml/L calculated according to the volume of the working solution;
step 2: the pH value of the passivation solution is regulated to 2.0, and the temperature is controlled to 20 ℃;
step 3: placing the product into black passivation treatment liquid through a gauze, turning over the product through the gauze, and taking out after 30 s;
step 4: and (3) providing the net bag, and moving the net bag into pure water for cleaning for 2-3 min.
Step five, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process mainly comprises the following 4 steps:
step 1: adding 50% pure water into a clean tank, adding a passivated infusion and a trivalent chromium wetting agent while stirring, wherein the concentration of the passivated infusion is 150ml/L calculated according to the volume of the working solution, and the concentration of the trivalent chromium wetting agent is 10ml/L calculated according to the volume of the working solution; preparing finishing working solution according to the method;
step 2: adjusting the pH value of the finishing liquid to be 4.5, and the temperature: 55 ℃;
Step 3: the fastener after black passivation and water washing of the electroplated zinc-nickel is soaked in finishing liquid through a gauze, and the product is taken out after being turned over for 30 seconds through the gauze;
step 4: and spin-drying the finished workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 400RPM, and the spin-drying time is 80 seconds, so that the finishing treatment is finished.
Step six, sealing the treatment part, mainly comprising the following 3 steps:
step 1: adding a sealing agent additive into the clean tank, wherein the concentration of the sealing agent additive is 80 percent calculated according to the volume of the working fluid; preparing a closed working solution according to the method;
step 2: the product is placed in a closed working solution through a gauze, turned over by the gauze and taken out after 30 s;
step 3: and spin-drying the closed workpiece by using a centrifugal machine, wherein the rotating speed of the centrifugal machine is 500RPM, and the centrifugal time is 60 seconds.
Step seven, drying treatment: pouring the metal fastener out of the gauze, placing the gauze in a metal tray for drying at 70 ℃ for 20min, and then cooling.
Comparative example 1:
comparative case 1 differs from embodiment case 1 in that embodiment case 1 is different in that the first, second, third and seventh steps of example 1 are completed without performing passivation and subsequent processes.
Comparative case 2:
comparative case 2 differs from example 1 in that example 1 was not subjected to the finishing process (step five), and the steps one, two, three, four, six and seven of example 1 were completed.
Test examples
After the surface treatment process flow in the first embodiment, the second embodiment, the third embodiment, the first comparison embodiment and the second comparison embodiment, the metal fastener is subjected to condensed tap water test according to the ISO 6270-2 standard method, and the red rust test result is evaluated and compared, so that the effectiveness of the novel process is verified.
The experimental method comprises the following steps: the method is carried out according to the ISO 6270-2 standard method, and adopts a constant humidity condensing mode, wherein the experimental temperature (40+/-3) DEG C and the experimental humidity are as follows: nearly 100%; the test was terminated by the presence of red rust during 240 hours with condensed tap water.
The test results of the condensed tap water performance of the metal fastener in the first embodiment, the second embodiment, the third embodiment, the first comparison embodiment and the second comparison embodiment are shown in table 1:
table 1: test result of condensed tap water performance of metal fastener
| Scheme for the production of a semiconductor device | Condensed tap water test (Red rust evaluation) |
| Embodiments of the invention Example 1 | 240 hours without red rust |
| Example 2 | 240 hours without red rust |
| Example 3 | 240 hours without red rust |
| Comparative example 1 | Red rust appeared at 24 hours |
| Comparative example 2 | Red rust appeared at 48 hours |
From the experimental data in table 1, it can be seen that:
after the zinc-nickel layer is electroplated on the metal piece, red rust appears on the metal piece after 24 hours without black passivation treatment and finishing treatment processes, and when the black passivation treatment is performed on the metal piece with the zinc-nickel layer, the red rust appearing time of the metal piece can be prolonged to 48 hours.
By adopting the process, after black passivation treatment, a finishing treatment process is carried out, so that the microcrack-shaped surface structure generated by black passivation is also protected, under the synergistic effect of post-sealing and drying, the microcrack layer is prevented from penetrating into the base material when condensate water is tested, the time of occurrence of red rust in condensate water testing is further prolonged, no red rust occurs in 240 hours in the experimental process, the condensate water testing performance of a metal fastener is effectively improved, and namely the corrosion resistance of a metal piece is effectively improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The surface treatment process for improving the condensate water testing performance of the metal piece is characterized by comprising the following steps of:
s1, carrying out an electroplating treatment process on a metal piece to generate a zinc-nickel alloy plating layer;
s2, performing a black passivation treatment process on the metal piece, and generating a passivation layer on the surface of the zinc-nickel alloy plating layer;
s3, carrying out a finishing treatment process on the metal piece, wherein the finishing treatment process comprises the following steps of: immersing the metal part in a finishing liquid, wherein the finishing liquid comprises a passivated impregnant with the concentration of 100-300 ml/L and a trivalent chromium wetting agent with the concentration of 5-10 ml/L, and the model of the passivated impregnant is Tridip; the trivalent chromium wetting agent is of the model of Tridip wetter;
s4, sealing the metal piece.
2. The surface treatment process for improving condensate water testing performance of metal pieces according to claim 1, wherein in S3, the metal pieces are soaked in the finishing liquid for 10-60 seconds.
3. The surface treatment process for improving the condensate water testing performance of a metal piece according to claim 1, wherein in the step S3, the pH of the finishing liquid is 4.0-4.5, and the temperature is 45-55 ℃.
4. The surface treatment process for improving condensate water testing performance of a metal piece according to claim 1, wherein in S3, further comprising the steps of: and (3) placing the metal piece in a centrifugal machine to spin for 60-90 seconds, wherein the rotating speed of the centrifugal machine is 400-600 RPM.
5. The surface treatment process for improving condensate water testing performance of a metal piece according to claim 1, wherein in S1, the electroplating treatment process comprises the following steps:
s11, adding NaOH and zinc concentrate into the electroplating bath, wherein the concentration of the NaOH is 120-140 g/L, the concentration of the zinc concentrate is 90-130 ml/L, and the zinc concentrate is a zinc-containing 75g/L and sodium hydroxide 330g/L solution;
s12, adding an alkaline zinc-nickel electroplating working solution into the electroplating bath, wherein the alkaline zinc-nickel electroplating working solution comprises a nickel complexing agent, a zinc complexing agent, a nickel extender and a brightening agent; wherein the concentration of the nickel complexing agent is 60-70 ml/L, the concentration of the zinc complexing agent is 60-70 ml/L, the concentration of the nickel extender is 7-15 ml/L, the concentration of the brightening agent is 0.3-0.8 ml/L, the model of the nickel complexing agent is a Performa 285R Base, the model of the zinc complexing agent is a Performa 285R Starter, the model of the nickel extender is a mixture of a Performa285 Ni-CPL, a Performa285 Additive H and a Performa 285R Additive, and the model of the brightening agent is 0.3-0.8 ml/L;
s13, placing the metal piece into a plating bath, and switching on the current of 0.5-0.8 ASD to plate the metal piece, so as to form a zinc-nickel alloy plating layer on the surface of the metal piece.
6. The surface treatment process for improving condensate water testing performance of a metal piece according to claim 1, wherein in S2, the black passivation treatment process comprises the following steps: adding passivation solution and water into the passivation tank to prepare zinc-nickel black passivation working solution, wherein the concentration of the passivation solution is 250-330 ml/L, and the pH value of the prepared zinc-nickel black passivation working solution is 1.9-2.3.
7. The surface treatment process for improving the condensate water testing performance of the metal piece according to claim 1, wherein in the step S4, the metal piece is put into a sealing additive for sealing treatment, and the concentration of the sealing additive is 80-100%.
8. The surface treatment process for improving condensate water testing performance of a metal piece according to claim 1, further comprising the steps of: after the metal piece is sealed, the metal piece is dried at the temperature of 60-80 ℃ for 20-30 min.
9. The surface treatment process for improving condensate water testing performance of a metal piece according to claim 1, further comprising a pretreatment process, wherein the pretreatment process comprises chemical degreasing, primary anodic electrolysis, acid washing, acid activation, secondary anodic electrolysis and presoaking in sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085724A (en) * | 2017-12-07 | 2018-05-29 | 江西博泉化学有限公司 | A kind of Zinc-Nickel coating layer technique |
| CN109881228A (en) * | 2019-03-27 | 2019-06-14 | 珠海市玛斯特锌镍加工有限公司 | A kind of closing process of part |
| CN111778532A (en) * | 2020-08-05 | 2020-10-16 | 扬州市景杨表面工程有限公司 | Alkaline zinc-nickel electroplating method for lock ring and embedded ring of automobile fuel tank |
| CN113862741A (en) * | 2021-09-23 | 2021-12-31 | 重庆铁马工业集团有限公司 | Treatment method for improving corrosion resistance of zinc-nickel alloy coating |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085724A (en) * | 2017-12-07 | 2018-05-29 | 江西博泉化学有限公司 | A kind of Zinc-Nickel coating layer technique |
| CN109881228A (en) * | 2019-03-27 | 2019-06-14 | 珠海市玛斯特锌镍加工有限公司 | A kind of closing process of part |
| CN111778532A (en) * | 2020-08-05 | 2020-10-16 | 扬州市景杨表面工程有限公司 | Alkaline zinc-nickel electroplating method for lock ring and embedded ring of automobile fuel tank |
| CN113862741A (en) * | 2021-09-23 | 2021-12-31 | 重庆铁马工业集团有限公司 | Treatment method for improving corrosion resistance of zinc-nickel alloy coating |
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