CN103726080A - Sodium potassium salt used for chloride zinc plating process and use of sodium potassium salt - Google Patents
Sodium potassium salt used for chloride zinc plating process and use of sodium potassium salt Download PDFInfo
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- CN103726080A CN103726080A CN201410010970.XA CN201410010970A CN103726080A CN 103726080 A CN103726080 A CN 103726080A CN 201410010970 A CN201410010970 A CN 201410010970A CN 103726080 A CN103726080 A CN 103726080A
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Abstract
The invention provides a sodium potassium salt used for a chloride zinc plating process and use of the sodium potassium salt. The sodium potassium salt is characterized by being composed of potassium iodate-containing salt and an additive according to a weight ratio of 10:(0.8-1.2), wherein raw materials of the additive comprises the following components in parts by weight: 7.0-8.5 parts of sodium sulfate, 1.5-2.5 parts of potassium citrate, 0.1-0.2 part of sodium benzoate, 0.05-1.5 parts of zinc sulfate and 0.10-2.5 parts of potassium sulfate. The sodium potassium salt plating solution is strong in uniform plating power and deep plating power, high in current efficiency, high in deposition velocity, quick in plating on high-carbon steel and iron casting, less in hydrogen evolution volume and low in possibility of causing fragility to flexible parts. Allowed fluctuation range of components of the plating solution is wide, surface activity action of chloride in the sodium potassium salt is good, and existence of a large number of chloridion can play a role of electron bridge, so that a plating layer is good in binding force; the components of the plating solution are simple and stable; production cost is low, and single cost of the sodium potassium salt composing the plating solution is only 50% of consumption adopting potassium chloride; the production process does not have sewage and exhaust emission, environment is protected, and energy is saved.
Description
Technical field
The invention provides a kind of natrium potassium salt for chloride galvanizing technique and uses thereof.
Background technology
At present, the zincincation adopting both at home and abroad, is mainly chloride galvanizing system, the zinc-plated system of prussiate and alkaline zinc plating system etc.Due to prussiate severe toxicity in the zinc-plated system of prussiate, waste water and waste gas pollute the environment, and poison coenocorrelation, mostly in situation, by non-cyanogen galvanization system, replaced, especially the electroplating technology of chloride galvanizing conducting salt has replaced the use of harmful chemical product prussiate.
Repone K and be main muriate bright galvanization system containing Potassium Iodate salt, its principal feature is without cyanogen, and plating solution simple and stable.Along with the progress of science, apply the plating industrial chemicals of traditional chloride galvanizing processing method, the galvanized workpiece processing, does not often reach current industry to specification of quality yet.Yet by improving, adopting Repone K is main muriate bright galvanization, has obvious improvement effect, has improved the coating performance in the low current region at recessed position, this is because potassium ion can reduce voltage, improves that the features such as electric current reach.Yet, according to galvanized workpiece differences in shape, need to prepare different galvanizing solutions, and Repone K cost is higher.
Simple iodic salt plating solution relatively cheaply, such as: plating solution contains sodium-chlor, zinc chloride, boric acid, chromic anhydride, potassium chromium sulfate, ammonium bifluoride and nitric acid etc., the galvanizing flux that contains these industrial chemicals, the original chloride galvanizing processing method of this class is to take sodium-chlor as conducting salt, the plating solution that it is prepared, generally, its dispersive ability and degree of depth ability, relatively prussiate system and alkaline zinc plating system are poor.Although cost is lower, its conductive capability is poor, makes uneven coating even.For example, the high galvanic areas coating that plates out the workpiece protrusion surface of coming is better, and still, the low current region at recessed position is often without coating.
Therefore, market is starved of develops performance and the effect that can reach prussiate system and alkaline zinc plating system bright galvanization liquid, its cost is low sodium-chlor muriate bright galvanization liquid again, the inventor studies through Specialty Experiment for many years, finally explore and found a kind of conducting salt for chloride galvanizing technique, take containing Potassium Iodate salt is main component, adding auxiliary makes, referred to as natrium potassium salt, and successfully, for the plating solution of chloride galvanizing technique conducting salt, dispersive ability can reach prussiate system level.Particularly in 2008 at home since listing, because it can improve the performance of plating solution, and can significantly improve that coating is smooth, even, bright, intensity, the performance such as anti-corrosion, won client's favorable comment.
Summary of the invention
The object of this invention is to provide a kind of natrium potassium salt for chloride galvanizing technique.
Another object of the present invention is to provide a kind of natrium potassium salt purposes for chloride galvanizing technique.
Task of the present invention completes like this.
According to the natrium potassium salt for chloride galvanizing technique of the present invention, it is characterized in that, natrium potassium salt is by according to the forming containing Potassium Iodate salt and auxiliary 10:0.8～1.2 of weight proportion, and wherein auxiliary feed composition is by weight ratio:
Preparation method: the above-mentioned auxiliary feed composition by by weight ratio, drop into respectively in stirred vessel, stir, obtain.
According to the natrium potassium salt for chloride galvanizing technique of the present invention, it is characterized in that, natrium potassium salt is by forming containing Potassium Iodate salt and auxiliary 10:0.9～1.1 according to weight proportion.
According to the natrium potassium salt for chloride galvanizing technique of the present invention, it is characterized in that, natrium potassium salt is by forming containing Potassium Iodate salt and auxiliary 10:0.9～1.1 according to weight proportion, and wherein the feed composition of auxiliary is by weight ratio:
Preparation method: the above-mentioned auxiliary feed composition by by weight ratio, drop into respectively in stirred vessel, stir, obtain.
Purposes according to the natrium potassium salt for chloride galvanizing technique of the present invention, is characterized in that, with formula material component and consumption that it prepares natrium potassium salt plating solution, is:
Surplus is water,
It is same as above containing the proportioning of Potassium Iodate salt and auxiliary in natrium potassium salt,
Natrium potassium salt plating solution is used for chloride galvanizing processing condition: 5～50 ℃ of temperature ranges, pH value 5.8-6.2, cathode current density scope 1.0～3.5A/dm
2, hang plating anode and move 12 beats/min.
According to conventional zincincation process treatment step: wash-zinc-plated-clear water of clear water washes that-20% tertiary sodium phosphate demoulding-clear water is washed-3% rare nitric acid, wash-chromic acid passivation-clear water of 2% sodium-chlor-bright dipping-clear water is washed-60 ℃ of hot water and scald-dried-aging-packing.
Bright blue passivation processing condition:
Colorful passivating process:
Above-mentioned containing Potassium Iodate salt raw material be selected from Hubei mineral products containing iodine edible salt, containing the edible salt of Potassium Iodate.Addition of C 2-87A agent is wherein the C2-87A agent that Qian Qiao auxiliary reagent factory, Wuxi City, Jiangsu Province produces.
The feature of the natrium potassium salt for chloride galvanizing technique of the present invention is as follows:
Apply natrium potassium salt plating solution prepared by natrium potassium salt of the present invention, covering power and covering power are strong, and current efficiency is high, and sedimentation velocity is fast, and on high carbon steel and ironcasting, soon, hydrogen-separating quantity is few, to elastic part, causes the possibility of fragility less in plating; Its bath composition allowable fluctuation range is broad, and the muriatic surface-active action in natrium potassium salt is good, and the existence of a large amount of chlorions can be played the effect of " electronic bridge ", and therefore, its binding force of cladding material is good; Its bath element is simple, stable; Investment cost is lower, forms the natrium potassium salt monomial cost accounting that plating solution adopts, and is only 50% consumption of the Repone K of employing; Its production technique is without sewage and exhaust gas emission, and environmental protection and energy saving.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but do not limit the present invention in any way.
What the embodiment of the present invention adopted is selected from Hubei mineral products containing iodine edible salt containing Potassium Iodate salt raw material, containing Potassium Iodate salt; The additive adopting is the C2-87A agent that Qian Qiao auxiliary reagent factory, Wuxi City, Jiangsu Province produces; The industrial salt that the sodium-chlor using is produced for Daliang City; Tripotassium Citrate and Sodium Benzoate are that foodstuff additive are used; Other reagent is chemical reagent.
Embodiment 1:
Auxiliary feed composition and consumption: 0.2 kilogram of 7.85 kilograms, sodium sulfate, 1.75 kilograms of Tripotassium Citrates, 0.1 kilogram of Sodium Benzoate, 0.1 kilogram, zinc sulfate and potassium sulfate,
Natrium potassium salt component and consumption: containing 10 kilograms of Potassium Iodate salt double centner, auxiliarys,
Preparation method: by each component of auxiliary, drop into respectively in agitator, stir, then drop into containing Potassium Iodate salt, and stir, obtain.
Composition of raw materials component and the consumption of natrium potassium salt plating solution are: zinc chloride 45 grams per liters, natrium potassium salt 200 grams per liters, boric acid 35 grams per liters, 15 milliliters/liter of addition of C 2-87A agent, surplus are water.
The preparation of natrium potassium salt plating solution is according to the ordinary method operation of chloride galvanizing liquid.
Chloride galvanizing processing condition: 5～50 ℃ of temperature ranges, pH value 5.8-6.2, cathode current density scope 1.0～3.5A/dm
2, hang plating anode and move 12 beats/min.
According to conventional zincincation process treatment step: wash-zinc-plated-clear water of clear water is washed-20% tertiary sodium phosphate demoulding-clear water and washed-3% rare nitric acid and wash-chromic acid passivation-clear water of 2% sodium-chlor-bright dipping-clear water scald-dry-aging-packing of washing-60 ℃ of hot water.
Bright blue passivation processing condition:
Colorful passivating process:
Embodiment 2:
Auxiliary feed composition and proportioning: 0.15 kilogram of 7.8 kilograms, sodium sulfate, 1.85 kilograms of Tripotassium Citrates, 0.15 kilogram of Sodium Benzoate, 0.05 kilogram, zinc sulfate and potassium sulfate,
Natrium potassium salt component and proportioning: containing 9 kilograms of Potassium Iodate salt double centner, auxiliarys,
Preparation method: by each component of auxiliary, drop into respectively in agitator, stir, then drop into containing Potassium Iodate salt, and stir, obtain.
Composition of raw materials component and the consumption of natrium potassium salt plating solution are: zinc chloride 55 grams per liters, natrium potassium salt 180 grams per liters, boric acid 40 grams per liters, 20 milliliters/liter of addition of C 2-87A agent, surplus are water.
The preparation of natrium potassium salt plating solution is according to the ordinary method operation of chloride galvanizing liquid.
Chloride galvanizing processing condition: 5～50 ℃ of temperature ranges, pH value scope 5.5～6.0, cathode current density scope 1.0～3.5A/dm
2, hang plating anode and move 12 beats/min.
According to conventional zincincation process treatment step: wash-zinc-plated-clear water of clear water washes that-20% tertiary sodium phosphate demoulding-clear water is washed-3% rare nitric acid, wash-chromic acid passivation-clear water of 2% sodium-chlor-bright dipping-clear water is washed-60 ℃ of hot water and scald-dried-aging-packing.
Bright blue passivation processing condition:
Colorful passivating process:
The principal feature of the natrium potassium salt plating solution of the embodiment of the present invention 1 and embodiment 2:
1, natrium potassium salt plating solution products material is the auxiliary of iodic salt and interpolation, all belongs to and cleans chemical product, and its preparation natrium potassium salt plating solution need not scarfing cinder, electrolysis, elimination organism, has saved largely energy consumption;
2, it is wide that natrium potassium salt plating solution forms allowable fluctuation range, and composition is simple, stable, and investment cost is low, saves energy;
3, natrium potassium salt plating solution is used raw material without cyanogen, chemical industry sintetics, and production process is pollution-free, and without waste water, exhaust gas emission, Green Product, meets country especially for the nuisanceless working condition of enterprise;
4, natrium potassium salt plating solution covering power and covering power are strong, and current efficiency is high, and sedimentation velocity is fast, and production efficiency is high;
5, the surface-active action of natrium potassium salt is good, and the existence of a large amount of chlorions can be played the effect of " electronic bridge ", and coating binding ability is better;
6, natrium potassium salt plating solution current efficiency is high, and hydrogen-separating quantity is few, to elastic part, causes the possibility of fragility little;
7, coating light, careful planarization is good;
8, the natrium potassium salt monomial cost accounting of natrium potassium salt plating solution is only 50% consumption that adopts Repone K plating solution.In chloride galvanizing technological test, the function analysis of aid component is as follows:
1, sodium sulfate: in the quick zincincation of vitriol, sodium sulfate belongs to conducting salt.As: galvanized iron wire, steel band, chain all belongs to sulfate zinc plating scope.The inventor utilizes electrochemistry electroplating principle, and sodium sulfate is made an addition in chloride galvanizing technique, found that than original plating condition current efficiency and increases significantly, and voltage obviously reduces, and the antiseptic power of zinc coating also extends thereupon.For example, the plating piece that does not add sodium sulfate in electroplate liquid goes out after groove washing, not passivation in exposed 5 minutes in air, and plating piece blackening, therefore, passivation in time, just can keep plating piece light.Yet the plating piece that galvanizing flux adds sodium sulfate by proportioning goes out after groove washing, adherence hour in air, hardly variable color.
Visible according to described observation, do not add sodium sulfate galvanized workpiece and go out groove, without passivation technology processing in time, plating piece will be subject to atmospheric oxidation, occurs the phenomenon of blackening.Added sodium sulfate plating piece and gone out after groove washing, placed a few hours, non-oxidation blackening phenomena, adds sodium sulfate in this explanation chloride galvanizing liquid, makes plating piece can improve the anticorrosion several times of coating, and under high current condition plating piece to go out groove fast, passivation is difficult for burning.
2, Tripotassium Citrate:, containing the simple iodic salt plating solution of auxiliary, its dispersive ability and covering power are not poor compared with prussiate system and alkaline zinc plating system, and still, while introducing Tripotassium Citrate in plating solution, dispersive ability can reach the level of prussiate system.
3, Sodium Benzoate: through evidence, when plating solution adds Sodium Benzoate, can improve current density, especially plating is fast on carbon steel, ironcasting are zinc-plated, and workpiece low current region covering power is good, uniform and smooth, leveling property is good.
4, potassium sulfate: through evidence, potassium sulfate can increase the current density of plating solution, reduces coating bath voltage, when plating piece is electroplated in groove, has and reduces the effect that workpiece burns passivation blackout.
5, zinc sulfate: the plating solution of chloride galvanizing technique of the present invention, although component and consumption allowable fluctuation range are broad, various chemical composition content ranges necessarily require in specialized range.Otherwise, out of proportion or exceed specialized range, there will be bad electroplating effect, particularly the content of zine ion is controlled, for example the weight part in natrium potassium salt is 0.05-1.5 part, must strictly detect by laboratory, can measure and learn the actual dose that add.The inventor had once done lot of experiments and proof-reading, when adding supplementary natrium potassium salt by chemical examination numerical value, must add the zine ion in plating solution thereupon, value to its equivalent, supplement the equivalent value of zine ion, by the consumption of the various electroplate liquid composition of long-term follow, determine, and the concrete consumption share obtaining by calculation consumption amount.
The natrium potassium salt nature and role of the embodiment of the present invention:
Natrium potassium salt is the conducting salt in solution, it is again the chlorion source of the weak ligand of zine ion, under the existence of a large amount of chlorions, can close ion with the synthetic various forms of chromium of zine ion chromium, zinc ion concentration is low, and chlorine ion concentration is high, and it generates the complex ion of ligancy, be conducive to the raising of solution dispersibility, this can prove from following table 1.
The component that table 1 plating solution is different and the comparison of consumption dispersive ability
Although the combination of chlorion and zine ion is very unstable, but to a certain extent, these electronegative complex anions have stoped the electric discharge of zine ion when anode discharge, played the effect that increases anodic polarization, table 1 shows to increase chlorine ion concentration, reduce zinc ion concentration or add Tripotassium Citrate, will be conducive to the improvement of solution dispersibility.
Admittance sylvite of the present invention too high levels in plating solution, when surpassing 200 grams per liters, winter, bath temperature dropped to 5 ℃ when following, have crystallization, be unfavorable for the improvement of plating solution performance simultaneously, when chloride ion content is low, not only affect dispersive ability and covering power, through Hull Cell, experimental results show that lighted region narrows down simultaneously.Therefore, be conventionally controlled at 180～200 grams per liters.
The natrium potassium salt plating solution of the embodiment of the present invention is used for the coating performance of chloride galvanizing technique:
1, outward appearance: coating light is careful;
2, bonding force: coating≤15 μ, through 190 ℃ of bakings 2 hours, puts into cold water non-foaming at once;
3, bending experiment: the steel plate of 0.5mm, thickness of coating 15 μ, are bent to disconnected peeling, bending non-scale;
4, fragility: thickness of coating is below 15 μ, and bending coating does not fall zinc foam to breaking;
5, neutral salt spray test: carry out neutral salt spray test according to national Post and Telegraph Department standard, result white chromating is corrosion-free through the experiment of 1 cycle, chromatic passivation reaches 1 grade through 4 cycle salt mist experiments, and green color passivation is corrosion-free through 6 cycle salt mist experiments, illustrates that zincincation plating solution passive film resistance to salt(spray)fog is good;
6, variable color experiment: colored passive films is indoor is placed in envelope 1 year, and colored passive films is unchanged, white chromating film be placed on equally in envelope 1 year 06 months unchanged.Plating solution maintenance:
Natrium potassium salt plating solution of the present invention is very stable, only need be through conventional precision test paper modulation pH value scope 5.8～6.2.The plating solution of producing, per season processes once with 2 grams per liter zinc powders, 1.0 milliliters/liter of hydrogen peroxide and gac 3 grams per liters.
Wastewater treatment:
During plating solution wastewater treatment, need, with aqueous sodium hydroxide solution adjust pH to 8.5～9.5, to make the Zn in waste water
2+generate Zn(OH)
2precipitation.In waste water other metallic impurity also simultaneously thus method deposition remove.For containing the wastewater treatment of auxiliary plating solution, with 310 atomic absorption spectrophotometers, measure, in waste water, contain Zn
2+during 8.5 mg/litre, with after aqueous sodium hydroxide solution adjust pH 9, record Zn
2+be below 5.25 mg/litre, substantially meet emission standard.
Claims (4)
1. for a natrium potassium salt for chloride galvanizing technique, it is characterized in that, natrium potassium salt is by according to the forming containing Potassium Iodate salt and auxiliary 10:0.8～1.2 of weight proportion, and wherein auxiliary feed composition is by weight ratio:
2. the natrium potassium salt for chloride galvanizing technique according to claim 1, is characterized in that, natrium potassium salt is by forming containing Potassium Iodate salt and auxiliary 10:0.9～1.1 according to weight proportion.
3. the natrium potassium salt for chloride galvanizing technique according to claim 1, is characterized in that, natrium potassium salt is by according to the forming containing Potassium Iodate salt and auxiliary 10:0.9～1.1 of weight proportion, and wherein the feed composition of auxiliary is by weight ratio:
4. according to the purposes of the natrium potassium salt for chloride galvanizing technique described in claim 1 or 3, it is characterized in that, with formula material component and consumption that it prepares natrium potassium salt plating solution, be:
Surplus is water,
In natrium potassium salt containing the proportioning of Potassium Iodate salt and auxiliary with described in claim 1 or 3,
Natrium potassium salt plating solution is used for chloride galvanizing processing condition: 5～50 ℃ of temperature ranges, pH value 5.8-6.2, cathode current density scope 1.0～3.5A/dm
2, hang plating anode and move 12 beats/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060303A (en) * | 2014-06-25 | 2014-09-24 | 滨中元川金属制品（昆山）有限公司 | Salt-spray-resistant galvanizing technique |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153388A (en) * | 2006-09-28 | 2008-04-02 | 比亚迪股份有限公司 | Plating liquid for electroless zinc plating for magnesium alloy |
| CN101948990A (en) * | 2010-09-29 | 2011-01-19 | 东北大学 | Electrolytic plating assisting method for hot dip galvanizing of steel wire and electrolytic plating assistant |
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2014
- 2014-01-09 CN CN201410010970.XA patent/CN103726080B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153388A (en) * | 2006-09-28 | 2008-04-02 | 比亚迪股份有限公司 | Plating liquid for electroless zinc plating for magnesium alloy |
| CN101948990A (en) * | 2010-09-29 | 2011-01-19 | 东北大学 | Electrolytic plating assisting method for hot dip galvanizing of steel wire and electrolytic plating assistant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060303A (en) * | 2014-06-25 | 2014-09-24 | 滨中元川金属制品（昆山）有限公司 | Salt-spray-resistant galvanizing technique |
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Effective date of registration: 20211018 Address after: 300450 No. 1801, gate 1, Donghai Yuntian Building 1, Dalian East Road, Tanggu, Binhai New Area, Tianjin Patentee after: Yu Miao Address before: 111000 housankuaishi 1 formation, Taizihe District, Liaoyang City, Liaoning Province Patentee before: Wang Yutian |