CN102534706A - Electroplating solution with strong permeability and high dispersibility for excellent green zinc alloy electroplating on casting surface - Google Patents
Electroplating solution with strong permeability and high dispersibility for excellent green zinc alloy electroplating on casting surface Download PDFInfo
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- CN102534706A CN102534706A CN2010105911455A CN201010591145A CN102534706A CN 102534706 A CN102534706 A CN 102534706A CN 2010105911455 A CN2010105911455 A CN 2010105911455A CN 201010591145 A CN201010591145 A CN 201010591145A CN 102534706 A CN102534706 A CN 102534706A
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Abstract
The invention discloses main composition components of an electroplating solution with high permeability and excellent dispersibility, and key operation elements when a casting is electroplated by the electroplating solution, and describes that a casting electroplated by the electroplating technology has the characteristics of good glossiness, flattened electroplated coating, uniform electroplated coating thickness, and air and oxidation resistance of the electroplated coating; additionally, neutral salt atomization tests and acid atomization tests of the electroplated coating reach the requirement of no corrosion spot for 96 hours specified by the country; and the electroplated coating completely meet the requirement of no corrosion for 30 years in the nature. Before electroplating, the casting needs no sand blasting or electrolytic degreasing, and after electroplating, the electroplated coating is bright and clean, and needs no polishing treatment.
Description
One, technical field
The present invention is that a kind of cast(ing) surface is electroplated relevant novel electroplate liquid; This electroplate liquid has the strong characteristics with good dispersivity of perviousness, and electroplating process does not have " three wastes " and discharges, and has the advantage that electroplating time is short, current density is low, electroplating effect is good; Be to form alloy in the metallic surface through electrochemical method; Thereby prevent the effective ways of metallic corrosion, promoting the use of of this method can be practiced thrift the great deal of steel resource for society.
Two, background technology
The material that steel casting is used is a cast iron, and the carbon content of cast iron is greater than 2%, and carbon exists with free state graphite or chemical combination attitude cementite form, receives sand mold and sticks; Reduce the hydrogen evolution current potential, hinder the metal normal sedimentation, the surface is very coarse; Uneven, hydrogen is separated out easily, cast(ing) surface and inside thereof exist a large amount of shrinkage cavities, sand holes; Gather solution in the space easily, these characteristics of foundry goods make the conductive capability of foundry goods descend, and have brought great difficulty for the good plating of cast(ing) surface; For the electroconductibility of improving foundry goods and the plating performance of improving foundry goods, foundry goods adopts the repair technology of sandblast, pore to handle cast(ing) surface before plating; Can improve the electroplating effect of foundry goods to a certain extent, the composition of repairing surface porosity simultaneously strengthens electroplates difficulty, but can't the uneven place and inner pore, sand holes, the hole that exists of Cast Iron Surface well be electroplated; After foundry goods after table is electroplated is placed for some time, part occurs and separate out acid and hydrogen evolution phenomenon, many hot spots occur.
The conductivity of casting material own is relatively poor; Adopt common Repone K HCD technology to electroplate; The electrolytic coating of gained is in uneven thickness; Thereby cause part coating to burn phenomenon, the perviousness of Repone K electroplating technology is not strong simultaneously, and the pore of Cast Iron Surface, sand holes can not well be electroplated; Adopt ammonia chloride craft to electroplate, though the perviousness of plating bath obtains improvement to a certain degree, the very thin thickness of coating prolongs electroplating time, and phenomenon appears burning in coating, does not reach good galvanized requirement; The alkali formula is zinc-plated to exist that zine plate consumption is many, the pore of cast(ing) surface can not galvanized shortcoming, and galvanized smooth finish of alkali formula and planeness do not meet the examination criteria of national regulation.
This patent is to take the novel electroplate liquid invented; The perviousness of this electroplate liquid is strong, good dispersivity; Foundry goods is in whole electroplating process; Can overcome all defect of existing cast iron electroplating technology; Realize that the foundry goods fast high efficiency high quality electroplates, this technology have thickness of coating evenly, good, the coating of coating glossiness and foundry goods firm binding force, coating is fine and close, the coating resistance of oxidation is good characteristics, the neutral salt atomizing of coating is tested, the acid mist test reaches state specified standards (no hot spot in 96 hours).
The result of literature search shows: the introduction for this kind electroplate liquid rarely has report.
Three, summary of the invention
The present invention is research object with the ironcasting that subway door uses, and has carried out the research of the strong perviousness and the high-quality plating liquid formula of dispersiveness, adopts this electroplate liquid that cast iron is carried out Zinc alloy electroplating, has obtained good electroplating effect.This kind electroplate liquid through carrying out the 3-6 month carries out galvanized stability test to foundry goods, and the result shows that this kind electroplating bath components is stable, and electroplating effect remains well, and electroplating technology remains stable.
1. goal of the invention
The objective of the invention is to reform existing electroplate liquid and form, improve the perviousness and the dispersiveness of electroplate liquid.Adopt neoteric electroplate liquid, under low current density, foundry goods is carried out high-quality plating, thereby realize the galvanized purpose of deep layer on steel casting surface.Each item index of coating meets national specified relevant criterion fully.Because the strong perviousness of new electroplate liquid and good dispersiveness, foundry goods have been cancelled the program of the repairing of preceding sandblast of foundry goods plating and surface porosity when pre-treatment; The alloy that coating surface forms in the electroplating process keeps good glossiness and degree of cleaning always, and the foundry goods after electroplating technology finishes has been cancelled the program of bright dipping, has reduced the generation of waste water.
2. technical scheme
Foundry goods carries out pre-treatment; Comprise the greasy dirt of removing the surface, three operations of iron rust, activation on pickling removal surface, then foundry goods is hung into special hook, hook is put into new electroplate liquid; Electroplated in advance 5 minutes, (the current density span of control is 0.5-2.0A/dm to the re-adjustment electroplating parameter
2), carrying out constant current and electroplate, every interval certain hour replenishes a certain amount of main brightener and softening agent, regulates current density; Electroplate after 25-35 minute, finish to electroplate, wash then, passivation and drying, obtain the good foundry goods of coating.
3. beneficial effect
The present invention has announced that cast(ing) surface carries out the galvanized electroplate liquid of efficient green and forms and electroplating technology; The electroplate liquid of this patent invention does not produce waste gas and waste residue in electroplating process; Electroplate liquid can recycled 80 batches; Carry out simple wastewater treatment then, the waste water after the processing is carried out fully recovering.
This method has the advantage that the foundry goods pre-treatment is simple, electroplating effect good, production process does not have " three wastes " discharging; Can effectively solve the waste water treatment problem in the present production technique; Zinc-plated with common alkali formula, Repone K is zinc-plated, the ammonium chloride zincincation is compared; Practiced thrift the electroplating cost of 60-80%, every square decimeter electroplating cost is about 1 yuan.
Embodiment
Below through embodiment the present invention is further described:
Embodiment 1
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent A10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-3A/dm
2, electroplate after 30 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, and drip washing, passivation, drying meet each item index of national regulation through checking plated item, and plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Embodiment 2
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent A10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), constant current is electroplated, holding current density 1-3A/dm
2, electroplate after 30 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, drip washing, passivation, drying, the friability test of process check plated item does not meet the index of national regulation, and plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Embodiment 3
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent A10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-2A/dm
2, electroplate after 45 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, and drip washing, passivation, drying meet each item index of national regulation through checking plated item, and plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Embodiment 4
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent B10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-3A/dm
2, electroplate after 30 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, and drip washing, passivation, drying meet each item index of national regulation through checking plated item, and plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Embodiment 5
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent B10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-2A/dm
2, electroplate after 45 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, and drip washing, passivation, drying meet each item index of national regulation through checking plated item, and plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Instance 6
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln; The control pH value of solution is 1-4; Add auxiliary agent A 6g, add carrier brightening agent A10-50g, add leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), constant current is electroplated, holding current density 1-2A/dm
2, electroplate after 45 minutes, to electroplate and finish, aftertreatment is according to the rules carried out, drip washing, passivation, drying,, the friability test of process check plated item does not meet the index of national regulation,, plated item is placed after 2 years and is not penetrated acid, and no hot spot occurs.
Instance 7
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln, control pH value of solution is 1-4, adds carrier brightening agent A10-50g, adding leveling agent A2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener B (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-3A/dm
2, electroplate after 30 minutes, electroplate and finish; Aftertreatment is according to the rules carried out, drip washing, passivation, drying, and the glossiness of electroplating back foundry goods coating is undesirable; All the other indexs of plating piece meet relevant national standards, and plated item is placed after 2 years and do not penetrated acid, and no hot spot occurs.
Embodiment 8
In the 10L plating tank, be that 99.5% KCl, 300-700g zinc chloride are poured in the plating tank with 700-1600g purity, add organic acid as buffered soln, control pH value of solution is 1-4, adds carrier brightening agent A10-50g, adding leveling agent B2-8g; Foundry goods is received on the electrode according to distinctive mode, according to 1-2A/dm
2Current density electroplate in advance, after 5-10 minute, electroplate in advance and finish; Add main brightener A (1-3g), softener A (1-2g), constant current is electroplated, holding current density 1-3A/dm
2, electroplate after 30 minutes, electroplate and finish; Aftertreatment is according to the rules carried out, drip washing, passivation, drying, and the planeness of electroplating back foundry goods coating is undesirable; All the other indexs of plating piece meet relevant national standards, and plated item is placed after 2 years and do not penetrated acid, and no hot spot occurs.
Claims (1)
1. be used for strong perviousness and the electroplate liquid of polymolecularity of the good green Zinc alloy electroplating of cast(ing) surface, comprise following requirement:
A) processing before foundry goods is electroplated comprises oil removing, pickling, activation, the various solution preparations of oil removing, pickling and activatory;
B) staple of the electroplate liquid of strong perviousness and polymolecularity and the content of every kind of composition thereof;
C) use the electroplate liquid of strong perviousness and polymolecularity that the good foundry goods of pre-treatment is carried out galvanized parameter index control;
D) aftertreatment of plating back product comprises washing, passivation and drying, the prescription of passivating solution, the drying means of electrolytic coating;
E) foundry goods is electroplated each item physical and chemical index analysis of the quality of back coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105911455A CN102534706A (en) | 2010-12-16 | 2010-12-16 | Electroplating solution with strong permeability and high dispersibility for excellent green zinc alloy electroplating on casting surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105911455A CN102534706A (en) | 2010-12-16 | 2010-12-16 | Electroplating solution with strong permeability and high dispersibility for excellent green zinc alloy electroplating on casting surface |
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| CN102534706A true CN102534706A (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105911455A Pending CN102534706A (en) | 2010-12-16 | 2010-12-16 | Electroplating solution with strong permeability and high dispersibility for excellent green zinc alloy electroplating on casting surface |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060254923A1 (en) * | 2005-05-11 | 2006-11-16 | The Boeing Company | Low hydrogen embrittlement (LHE) zinc-nickel plating for high strength steels (HSS) |
| CN101775628A (en) * | 2010-03-16 | 2010-07-14 | 南京工程学院 | Novel process for plating zinc on surface of steel casting |
-
2010
- 2010-12-16 CN CN2010105911455A patent/CN102534706A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060254923A1 (en) * | 2005-05-11 | 2006-11-16 | The Boeing Company | Low hydrogen embrittlement (LHE) zinc-nickel plating for high strength steels (HSS) |
| CN101775628A (en) * | 2010-03-16 | 2010-07-14 | 南京工程学院 | Novel process for plating zinc on surface of steel casting |
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Application publication date: 20120704 |