CN1015481B - Sodium salt zn-plating secondary passivation filming technology - Google Patents
Sodium salt zn-plating secondary passivation filming technologyInfo
- Publication number
- CN1015481B CN1015481B CN 89104391 CN89104391A CN1015481B CN 1015481 B CN1015481 B CN 1015481B CN 89104391 CN89104391 CN 89104391 CN 89104391 A CN89104391 A CN 89104391A CN 1015481 B CN1015481 B CN 1015481B
- Authority
- CN
- China
- Prior art keywords
- plating
- sodium salt
- grams per
- per liter
- blooming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The present invention relates to a sodium salt Zn plating grade low chrome secondary passivation formula and technology, which can be used for a plating layer of different metal. The formula and the technology have the advantages of wide material sources, low price of materials, simple technology, easy control, energy saving and external decorative performance enhancement of the plating layer, and cost is reduced by more than 70%. Simultaneously, waste water pollution is thoroughly prevented.
Description
The present invention relates to sodium salt Zn-plating secondary passivity blooming technique, relate in particular to and in plating, adopt sodium salt Zn-plating and secondary passivity to add the membrane process technical field.
The coating of various metallic substance generally is meant the plating on the iron-based body.At present, what usually adopt is the plating process of copper nickel chromium triangle, cost height not only aborning, and following defective is arranged:
(1), technology is numerous and diverse.The plating process of copper nickel chromium triangle is four platings, promptly gives nickel one bright copper one bright nickel one chromium layer.This kind technology materials are many, long flow path, and the maintenance workload of processing and electrolytic solution is big;
(2), energy consumption is big, copper-nickel-chrome plating technology consumes a large amount of electricity, water, coal.Per thousand decimeters
2Want electricity consumption 54.1 degree, 19 tons of water consumptions;
(3), environmental pollution is serious.In the waste water that copper-nickel-chrome plating technology is discharged, every liter with regard to cupric＞2 milligram, nickel＞100 milligram, chromium (sexavalence)＞22 milligram, deleterious in addition chromic acid gas, serious polluted source, soil and air;
(4), the material cost height, in copper-nickel-chrome plating technology, year the consumption metal and chemical materials can reach 46 kinds, comprising rare valuable metallic nickel in short supply and phosphor-copper, chromic anhydride etc. are arranged.Per thousand decimeters
2The copper materials are 0.66 kilogram, 1.04 kilograms in nickel, 0.26 kilogram of chromium.Average unit cost by 88 years material costs is calculated per thousand decimeters
2Rise 3.65 times, because the cost height causes the loss of enterprise.
The purpose of this invention is to provide a kind of sodium salt Zn-plating secondary passivity blooming technique.Adopt this technology in the coating system of metallic substance, select for use material source wide, the cheap technology of material price is simple and easy to control.In sodium salt Zn-plating passivation secondary blooming technique, have only micro-zinc chrome to discharge, thoroughly stopped a large amount of obnoxious flavour of copper nickel chromium triangle technology discharge and the pollution of waste water; Reduced production cost widely, saved energy consumption, and the outward appearance of coating is for there being the imitative chromium outward appearance of blue look slightly, luminance brightness is good.Reached the industry quality standard of plated item fully.
Sodium salt Zn-plating secondary passivity blooming technique of the present invention mainly is to adopt sodium salt Zn-plating and secondary passivity blooming.Its sodium salt Zn-plating, normal temperature are one blunt, high temperature two blunt used treatment solutions are composed as follows:
1, sodium salt Zn-plating
Zinc chloride 55-90 grams per liter
Sodium-chlor 150-200 grams per liter
Boric acid 30～40 grams per liters
Brightening agent-86 10-20 milliliter/liter
(Xiao Tangshan Electroplate Factory in Changping produces, and major ingredient is benzylideneacetone, Sodium Benzoate)
2, normal temperature one is blunt
Chromic anhydride 0.1-1 grams per liter
Potassium chromium sulfate 10-30 grams per liter
Ammonium bifluoride 5-20 grams per liter
Nitric acid 5-20 milliliter/liter
3, high temperature two is blunt
Chromic anhydride 0.2-0.5 grams per liter
Be elaborated with regard to sodium salt Zn-plating secondary passivity blooming technique of the present invention below:
Sodium salt Zn-plating secondary passivity blooming of the present invention is the electroplating technology that replaces complicated copper nickel chromium triangle with sodium salt Zn-plating and secondary passivity blooming, come rare valuable nickel metal in the Alloy instead of Copper nickel chromium triangle technology with zinc, alleviate the burden of import nickel, save foreign exchange, other industrial chemicals have also been saved simultaneously, reduce cost energy efficient.
Because it is significantly different to adopt sodium salt Zn-plating secondary passivity blooming to compare with the plating process of native copper nickel chromium triangle on composition that materials are handled and technology.In sodium salt Zn-plating, select the extremely low zinc of price for use, be that preservative property are better than the cathodic coating of copper nickel chromium triangle, and can stop the pollution of copper nickel chromium triangle to greatest extent because zinc belongs to anodic protection for the iron-based body.For quality and the decorate properties that guarantees zinc coating, overriding concern is planarization and the luminance brightness that improves the zinc layer aborning, but also the materials of will considering to fill a prescription are suitably asked letter.In whole sodium salt Zn-plating secondary passivity blooming, the selecting for use of various materials, proportioning, the finishing of every operation all is based on above each point and is definite.
Sodium salt Zn-plating secondary passivity blooming technique flow process of the present invention is: the alkaline degreasing one acid pickling and rust removing one buck diluted acid that neutralizes corrodes a sodium salt Zn-plating one and cleans out a bright normal temperature one a blunt high temperature two a blunt high temperature closure one blooming one levelling one dryings.
(1), alkaline degreasing
With the aqueous solution of industrial caustic soda 30-60 grams per liter, temperature 〉=80 ℃ are placed on plating piece in the aqueous solution of caustic soda and soaked 1-2 hour.Matrix lip-deep oil stain in machining process of its plating piece is removed, its plating piece is taken out with clear water (tap water) clean then.
(2), acid pickling and rust removing
Prepare pure acid solution with industrial nitric acid and hydrochloric acid, its ratio is a nitric acid: hydrochloric acid=1: 24～30.To carry out pickling at normal temperatures through the plating piece behind the alkaline degreasing, purpose is for removing the corrosion on the iron-based body, and the time is 2-4 minute, afterwards, plating piece is cleaned with clear water again.
(3) buck neutralization
By concentration is the aqueous solution of the industrial caustic soda of 10-30 grams per liter, at normal temperatures the plating piece after the above-mentioned pickling is put into diluted alkaline water and neutralizes, and soaks.For preventing reoxidizing of matrix, plating piece is placed on protection and to be plated in the diluted alkaline water.
(4) diluted acid corrosion
Plating piece by proposing in the diluted alkaline water, is cleaned with clear water once more.Put into concentration and be 20～60 milliliters/liter technical hydrochloric acid solution, carry out at normal temperatures, the time is 5～20 seconds.Before making plating piece put into coating bath, maintain the surface of purified iron-based body.
(5) sodium salt Zn-plating
The preparation of a, electrolytic solution:
1. zinc chloride is pressed the 55-90 grams per liter, sodium-chlor 150～200 grams per liters calculate, and use the hot water dissolving, add the boric acid with molten 30～40 grams per liters only of boiling water, add water to 2/3 place of coating bath.In coating bath, add the zinc powder of every liter 1～2 gram, fully stirred then 0.5 hour, leave standstill, precipitate 1～2 hour, and after-filtration, cooling.
2. will transfer the pH value of plating bath between 4.5～6 with 1: 6 the hydrochloric acid and the solution of water.
3. by 10～20 milliliters/liter brightening agent-86, calculate expense, again with the 2-4 that is equivalent to the brightening agent total amount doubly be lower than that 50 ℃ hot water stirs brightening agent gradually, dissolving, dilution, cooling.Be that brightening agent is slowly added in the hot water at this moment.The aqueous solution with brightening agent adds in the solution of coating bath then.
4. in coating bath, adding water to needs volume, stirs evenly, leaves standstill, electrolysis, examination plating.
B, electroplating technique condition
7～45 ℃ of temperature
0.6～1.6 ampere/decimeter of cathode current density
2
Cathode area: annode area=1: 1～1.5
25～35 minutes time
Plating piece after the washing of diluted acid burn into is put into coating bath carry out electro-galvanizing.
(6), clean out bright
Plating piece after zinc-plated is cleaned with clear water, put into the concentration for preparing in advance and be in 20～30 milliliters/liter the aqueous nitric acid.The purpose of cleaning with salpeter solution is to make the plating piece after zinc-plated guarantee the pure and bright of zinc coating surface.Nitric acid cleans and carries out at normal temperatures, and the time is 3～6 seconds.With the plating piece after the salpeter solution cleaning, still need to clean with clear water, carry out passivation then.
(7), normal temperature one is blunt
With chromic anhydride 0.1～1 grams per liter, potassium chromium sulfate 10～30 grams per liters, ammonium bifluoride 5～20 grams per liters, 5～20 milliliters of/liter four kinds of raw materials of nitric acid, add one by one in the entry and molten clean by calculated amount, add fashionable otherwise the stirring that stops.To enter normal temperature one blunt from cleaning out bright operation for plating piece, and the time is 3～6 seconds.Through normal temperature passivated, make the skeleton of its plating piece formation passive film, improve thickness, stability and the physical strength of passive film.
(8), high temperature two is blunt
Add water-soluble only by the calculated amount of chromic anhydride 0.2～0.5 grams per liter, become the aqueous solution of chromic anhydride, be warmed to＞90 ℃, after the plating piece after normal temperature passivated is cleaned with clear water, put into the aqueous solution of chromic anhydride, it is blunt to carry out high temperature two, and the time is 1～3 second.Plating piece is further filled through normal temperature passivated established passive film, thereby guarantee that the color and luster of coating improves the decorate properties of electrochemical provide protection and outward appearance.
(9), high temperature closure
After cleaning with clear water through the plating piece of high temperature passivation, put into boiling water, propose rapidly then, make its coating itself carry out self sealing, and make rapid-curing cutback after the plating piece water outlet.
(10) blooming
Protect photo etching (it is that vinylbenzene, acrylic resin now change YZ-1 varnish into that immortality auxiliary reagent factory in Shanghai produces major ingredient) by 8351: the proportioning of 8351-1 thinner (major ingredient is deionized water, ethanol)=1: 3～6 prepares protects light liquid, then plating piece is sprayed or soaks with protecting light liquid.Blooming technique is to make coating add the organic transparent film of one deck after passivation, overcomes that zinc coating is soft, the shortcoming of scale resistance difference to be strengthening the luminance brightness of coating, and abilities such as water-fast part, anti-atmospheric oxidation and mechanical wear increase weather resistance.
(11), levelling
Levelling under the normal temperature, does its plating piece face at 10～15 minutes time.
(12), drying
At last plating piece is carried out natural air drying or oven dry.Natural air drying 〉=10 hour are dried 50～60 ℃, get final product in 2 hours.
What sodium salt Zn-plating secondary passivity blooming technique of the present invention adopted is that material source is extensive, and the zinc chloride that price is extremely low than copper-nickel-chrome plating technology, significantly reduces cost, and the cost reduction can reach more than 70%, and energy efficient reaches more than 60%; In the technology of whole coating, reduce to 11 kinds, simplified production process, help grasping the materials proportioning by former 46 kinds of industrial chemicals, and the preparation and the maintenance of electrolytic solution; Obnoxious flavour and nuisance have thoroughly been stopped to produce in the copper-nickel-chrome plating technology to soil, contaminated water source; The quality of while coating, resisting salt fog corrosion reaches 8 hours, surfaceness
More than 7, decorate properties and luminance brightness all reach the industry quality standard (referring to subordinate list) of plated item.
Subordinate list
Two kinds of technology comparison sheets of per thousand square decimeters coating
Type sodium salt Zn-plating passivation blooming technique copper nickel chromium triangle technology
Project
The coating system is zinc-plated, nickel, bright copper, bright nickel, chromium are given in passivation, organic membrane
Materials (kind) 11 46
The technology difficulty or ease are easily difficult
Have pollution-free no serious
Copper 0.66
Material consumption (kilogram/thousand dm
2) zinc: 1 nickel 1.04
Chromium 0.26
Can power consumption (degree) 21.6 54.1
Water (ton) 7.6 19.0
Cost (unit/thousand dm
2) 63.85 308.88
Quality standard resisting salt fog corrosion 10 hours rustless 8 hours is rustless
8 hours
Surfaceness
7-
8
7
Embodiment:
With 40 kilograms of aqueous solution that add 1000 kilograms of caustic soda, temperature 〉=80 ℃ are soaked and to be carried out alkaline degreasing in 1～2 hour with the matrix of cell mount plating piece; Carry out pickling with 10 liters of pure sour mixing solutionss of nitric acid again with 300 liters of hydrochloric acid; Can be placed on then in the caustic soda aqueous solution that 20 kilograms in caustic soda adds 1000 kilograms in water, normal temperature soaks down, protection; With 70 kilograms of zinc chloride, 500 liters of hot water dissolvings of 180 kilograms of usefulness of sodium-chlor, and add zinc powder with 30 kilograms of the molten clean boric acid of boiling water and 1 kilogram, fully stir and left standstill, precipitate 1～2 hour in 0.5 hour, and after-filtration, cooling, use 1: 6 aqueous hydrochloric acid to align the pH value of above-mentioned plating bath between 4.5～6 again, add 10 liters of brightening agents-86 simultaneously, 50 ℃ the hot water of being lower than with 30 liters stirs brightening agent gradually, dissolving, the cooling back adds in the above-mentioned plating bath, and the plating bath for preparing is added water to 1000 liters, fully stir evenly electrolysis.At 7～45 ℃ of temperature, cathode current density 0.6～1.6A/dm
2＞1～1.5(area), the time is under 25～35 minutes conditions, negative electrode: anode=1:, will carry out sodium salt Zn-plating through the plating piece that 40 liters of hydrochloric acid add after the diluted acid corrosion of 1000 liters in water; Plating piece after zinc-plated is cleaned out bright (3-6 second) with the aqueous nitric acid that 30 liters in nitric acid adds 1000 liters in water; Then with 2 kilograms of chromic anhydride 200 gram potassium chromium sulfates, 1.5 kilograms of ammonium bifluorides, 2 liters in nitric acid, four kinds of raw materials add in 300 premium on currency and molten clean one by one, with plating piece carry out at normal temperatures 5 seconds primary normal temperature passivated; Add the water-soluble clean of 200 liters in water with chromic anhydride 40 grams, be warmed to＞90 ℃ of high temperature passivation second time of carrying out 2 seconds; Then plating piece is put into boiling water, carry out high temperature closure, propose rapidly then; Protect 100 liters of photo etchings with 8351,400 liters of mixing of 8351-1 thinner are carried out organic blooming with the plating piece dipping after zinc-plated; Levelling is 10～15 minutes under the normal temperature, and surperficial face is done; Carry out about 10 hours natural air dryings at last.Through above each operation, the cell mount plating piece is electroplated and is finished.
Claims (3)
1, sodium salt Zn-plating secondary passivity blooming technique, it is characterized in that alkaline degreasing, acid pickling and rust removing, buck neutralization, diluted acid burn into sodium salt Zn-plating, clean out that bright, normal temperature is one blunt, high temperature is two blunt, high temperature closure, blooming, levelling, drying process, the used treatment solution of each operation is as follows:
Sodium salt Zn-plating:
Zinc chloride 55-90 grams per liter
Sodium-chlor 150-200 grams per liter
Boric acid 30-40 grams per liter
Brightening agent-86 10-20 milliliter/liter
(brightening agent-86 is that Changping Xiao Tangshan Electroplate Factory produces major ingredient benzylideneacetone, Sodium Benzoate)
Normal temperature one is pure:
Chromic anhydride 0.1-1 grams per liter
Potassium chromium sulfate 10-30 grams per liter
Ammonium bifluoride 5-20 grams per liter
Nitric acid 5-20 milliliter/liter
High temperature two is blunt:
Chromic anhydride 0.2-0.5 grams per liter
Blooming:
8351 protect photo etching: (8351 protect immortality auxiliary reagent factory, photo etching Shanghai produces, and major ingredient is vinylbenzene, acrylic resin, now changes YZ-1 varnish in 8351-1 thinner=1: 3～6; 8351-1 thinner major ingredient is deionized water, ethanol).
2, sodium salt Zn-plating secondary passivity blooming technique according to claim 1 is characterized in that the sodium salt Zn-plating operation, and temperature 7-45 ℃, time 25-35 minute, cathode current density was 0.6～1.6A/dm
2, cathode area: annode area=1: 1～1.5.
3, sodium salt Zn-plating secondary passivity blooming technique according to claim 1, it is characterized in that high temperature two blunt technologies temperature required＞90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89104391 CN1015481B (en) | 1989-06-30 | 1989-06-30 | Sodium salt zn-plating secondary passivation filming technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89104391 CN1015481B (en) | 1989-06-30 | 1989-06-30 | Sodium salt zn-plating secondary passivation filming technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1048418A CN1048418A (en) | 1991-01-09 |
| CN1015481B true CN1015481B (en) | 1992-02-12 |
Family
ID=4855544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89104391 Expired CN1015481B (en) | 1989-06-30 | 1989-06-30 | Sodium salt zn-plating secondary passivation filming technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015481B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694914B (en) * | 2013-12-05 | 2017-03-15 | 万向一二三股份公司 | A kind of surface pre-treating process of lithium ion cell positive etched foil |
| CN103938204B (en) * | 2014-04-24 | 2016-08-17 | 上海坤孚企业(集团)有限公司 | A kind of zinc alloy surface processing method |
| CN105132907A (en) * | 2015-09-09 | 2015-12-09 | 宁波亚大金属表面处理有限公司 | Surface treatment process for eye joint of brake pipe |
| CN105112911A (en) * | 2015-09-09 | 2015-12-02 | 宁波亚大金属表面处理有限公司 | Surface treatment process for cooling water pipe joint assembly |
| CN105132906A (en) * | 2015-09-09 | 2015-12-09 | 宁波亚大金属表面处理有限公司 | Surface treatment process for fuel pipe union assembly of engine |
-
1989
- 1989-06-30 CN CN 89104391 patent/CN1015481B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1048418A (en) | 1991-01-09 |
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