CN101545125A - Bright corrosion resisting zinc-iron alloy plating process - Google Patents
Bright corrosion resisting zinc-iron alloy plating process Download PDFInfo
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- CN101545125A CN101545125A CN200910038328A CN200910038328A CN101545125A CN 101545125 A CN101545125 A CN 101545125A CN 200910038328 A CN200910038328 A CN 200910038328A CN 200910038328 A CN200910038328 A CN 200910038328A CN 101545125 A CN101545125 A CN 101545125A
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Abstract
The invention discloses a bright corrosion resisting zinc-iron alloy plating process which comprises the step of adding complexing agent and ferrous ion to zincate zincification solution. Zinc-iron alloy plating bath comprises 6-12g/L of ZnO, 90-150 g/L of NaOH, 20-50 mL/L of trolamine, 5-13g/L of FeSO4.7H2O, 2-8mL/L of DE, 0.5-1g/L of ethylenediamine tetracetic acid, 0.02-0.1 g/L of vanillina, 0.02-0.1 g/L of dodecyl sodium sulfate and 1-2 g/L of Zn powder. The process can reach the cathode current efficiency of 90 percent, is easy to control the alloy component and can obtain bright zinc-iron alloy plating containing 17-20 percent of iron; in addition, electrochemistry and salt-spray fog corrosion results show that the bright zinc-iron alloy plating has better corrosion resistance than pure zinc plating chromating, and the bright zinc-iron alloy plating has better protection property and decoration performance.
Description
Technical field
The present invention relates to metallic surface electroplating zinc alloy technology, particularly relate to a kind of alkali plating solution electroplating bright corrosion resisting zinc-iron alloy prior.
Background technology
One of effective steel surface protection technology of zinc-plated conduct has been widely used in accounting for 1/3～1/2 of whole electroplating industry in the protection of steel and iron member.But along with development of science and technology, more and more higher to the coating service requirements, on zinc-plated basis, developed zinc base alloy coating, zinc bace composite coating layer.Zinc base alloy coating has Zn-Ni, Zn-Fe, Zn-Co, Zn-Cu, Zn-Mn etc.Wherein zn-fe alloy coating is because of the iron wide material sources, and the lower and research of cost is also used at most.
Zn-fe alloy coating is divided into low iron zn-fe alloy coating and high ferro zn-fe alloy coating by iron level.The iron-holder of low iron zn-fe alloy coating is lower than 1%, solidity to corrosion is compared with pure zinc layer and is improved more than 3 times behind the chromating, but it is that hexavalent chromium concentration in the passive film is higher that its solidity to corrosion is better than one of reason of zinc coating, and sexavalent chrome is easily carcinogenic, expressly provides in the ROHS of the European Union instruction that sexavalent chrome is to be invested in one of the new electronics in market and 6 kinds of objectionable impuritiess that electrical equipment does not wrap.The iron level of high ferro zn-fe alloy coating〉1%, have coating preferably, easily carry out bonderizing.But then study lessly to the passivation of high ferro zinc-iron alloy at present, the bright zinc-iron alloy of iron-holder about 5% is carried out passivation, gained rete outward appearance is sky blue, but the salt air corrosion result shows that its solidity to corrosion is on the contrary not as zinc coating.
For galvanic deposit high ferro zinc-iron alloy technology, present existing report mainly is to obtain in sulfate system and pyrophosphate salt system, and the current density that sulfate system allows is higher, and is little to equipment contaminate, but its dispersive ability is relatively poor, and the coating of gained is comparatively coarse.Once there is the seventies people from pyrophosphate plating solution, to obtain the higher zn-fe alloy coating of iron-holder, but just as chromed bottom, and could chromium plating after need polishing or the plated with copper.For zincate plating electrodepositing zinc iron alloy technology, what study morely at present is low iron zinc-iron alloy (being that iron level is less than 1%), then studies lessly to zincate galvanic deposit high ferro zn-fe alloy coating.At present, in alkali plating solution, obtained bright zn-fe alloy coating [the Narasimhamurthy V of iron-holder 15%～25%, Sheshadri B S.Electrodeposition of zinc-iron from an alkalinesulfate bath containing methanolamine.Metal Finishing, 1997 (09): 44-47], but temperature was up to 50 ℃ when this technology was electroplated, in electroplating process, need heating to increase energy consumption, and cathode efficiency lower (the theoretical zinc-iron alloy deposition of cathode efficiency=actual zinc-iron alloy deposition ÷), only be about 70%, lower cathode efficiency makes in the electroplating process sedimentation velocity slower, and energy consumption increases.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of and can effectively improve the steel part solidity to corrosion, obtain the high ferro zinc-iron alloy to carry out the trivalent chromium passivation, the bright corrosion resisting zinc-iron alloy plating process of high cathode current efficiency is arranged again.
The present invention is on zincate galvanizing technology basis, adds complexing agent and ferrous ion, the minute surface light zn-fe alloy coating that can to obtain iron-holder at normal temperatures be 17%～20%, can carry out the trivalent chromium passivation.Its solidity to corrosion is better than the white passivation of zinc coating after the passivation.This technology is removed outside the original characteristics of zincate galvanizing technology that keep (promptly institute's coating that obtains is careful, and dispersive ability is higher, and is pollution-free to equipment), and cathode efficiency brings up to 90%.For reaching above-mentioned purpose, the technical process that the present invention adopts is: preparation zinc-iron alloy plating bath → plating piece is carried out surface preparation → electroplating zinc-iron alloy → trivalent chromium passivation.
A kind of bright corrosion resisting zinc-iron alloy plating process comprises the steps and processing condition:
(1) configuration zinc-iron alloy plating bath: the zinc-iron alloy plating bath is the aqueous solution, and its constituent concentration is ZnO 6～12g/L, NaOH 90～150g/L, trolamine 20～50mL/L, FeSO
47H
2O 5～13g/L, the synthetics of dimethylamine and epoxy chloropropane (DE) 2～8mL/L, ethylenediamine tetraacetic acid (EDTA) 0.5～1g/L, Vanillin 0.02～0.1g/L, sodium laurylsulfonate 0.02～0.1g/L, Zn powder 1～2g/L;
(2) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 0.5～3A/dm in cathode current density
2, temperature is an electrodepositing zinc iron alloy 20～60 minutes under 20～40 ℃ the condition, after the galvanic deposit workpiece is taken out, successively through washing, passivation, washing, air-dry and aging once more make the bright corrosion resisting zinc-iron alloy.
Described pre-treatment is with sand paper steel surface to be polished; In alkaline mixed aqueous solution steel are carried out electrochemical deoiling and handle, the component of described alkaline mixed aqueous solution and weight concentration thereof are: 3%～7% NaOH, 3%～7% Na
2CO
3With 0.4%～0.7% OP emulsifying agent; With 70～90 ℃ of clear water of temperature steel are washed; In weight concentration 10%～15% H
2SO
4With in 0.1%～0.3% the sulphur urine mixed aqueous solution steel are carried out acid pickling and rust removing; With clear water steel are washed again; In temperature is 20～40 ℃ the aqueous solution that contains HCl 3%～5% (weight), activate 20～60 seconds, wash with water again.
The collocation method of described zinc-iron alloy plating bath is: according to the requirement of constituent concentration in the zinc-iron alloy plating bath aqueous solution, the water that in coating bath, adds zinc-iron alloy plating bath cumulative volume 30%～50%, solid NaOH is poured in the water, after the stirring and dissolving,, under agitation add NaOH solution with the ZnO of furnishing pasty state, add water to 60%～80% of zinc-iron alloy plating bath cumulative volume Deng fully after the dissolving, the Zn powder is added, stirred 25～35 minutes, again clarification filtration; In another container, with an amount of water with the dilution of the trolamine that measures after, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics (DE), ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then; With a spot of water heating for dissolving, join in the plating bath after the cooling sodium laurylsulfonate; The water that adds surplus in the proportioning continues stirring plating bath is mixed.
With respect to prior art, the invention has the beneficial effects as follows: the zn-fe alloy coating surface minute surface light that is 1. obtained, iron-holder 17%～20% can be carried out the trivalent chromium passivation, and its solidity to corrosion is better than the white passivation of pure zinc layer chromic salt after the passivation.2. this technology is removed outside the advantage (be the careful light of coating, the coating that obtains is mingled with few, and dispersive ability is better, and equipment is not had corrosion) that keeps original zincate galvanizing system, cathode efficiency can be brought up to 85%～91%.
Description of drawings
Fig. 1 is a Zn coating microscopic appearance.
Fig. 2 is a Zn-17.5Fe alloy layer microscopic appearance.
Fig. 3 is the white passivation of Zn coating chromic salt, the polarization curve of the white passivation of Zn-17.5Fe alloy layer trivalent chromium in 5%NaCl solution.
Fig. 4 is the histogram that the white passivation of Zn coating chromic salt, the white passivation of Zn-17.5Fe alloy layer trivalent chromium coating in 5%NaCl salt air corrosion began to occur 5% white rust time.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described, need to prove, following embodiment does not constitute the qualification to the claimed scope of the present invention.
Anode is a stainless steel, and specification is 50mm * 40mm * 1mm.Negative electrode is the Q235 steel plate, and specification is 40mm * 30mm * 1mm.
(1) configuration zinc-iron alloy plating bath: preparation 1000mL plating bath, plating bath consists of: ZnO10g, NaOH 130g, trolamine 30mL, FeSO
47H
2O8g, the synthetics of dimethylamine and epoxy chloropropane (DE) 4mL, ethylenediamine tetraacetic acid (EDTA) 0.8g, Vanillin 0.04g, sodium laurylsulfonate 0.02g, Zn powder 2g.In coating bath, add 400mL water, solid NaOH is poured in the water, after the stirring and dissolving,, under agitation add NaOH solution the ZnO of furnishing pasty state.Add water to 700mL Deng fully after the dissolving, add 2g Zn powder, stirred 30 minutes, again clarification filtration.In a beaker, after usefulness 200mL water dilutes trolamine, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics (DE), ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then, and stirring makes its dissolving.Again with sodium laurylsulfonate with a spot of water heating for dissolving, join after the cooling in the plating bath, add water to 1000mL.Continuing to stir mixes plating bath.
(2) steel pre-treatment: with sand paper steel surface is polished, be respectively 5% NaOH, 7% Na in the constituent weight percent concentration
2CO
3With in 0.7% the OP emulsifier mix aqueous solution steel are carried out electrochemical deoiling; With temperature is that 80 ℃ of clear water are washed steel; Be respectively 15% H with the constituent weight percent concentration
2SO
4With under 0.2% the thiocarbamide mixed aqueous solution room temperature steel are carried out acid pickling and rust removing; With clear water steel part is washed again; In temperature is to activate 30 seconds 30 ℃ contain in HCl 4% (weight) solution; Wash with water again.
(3) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 1A/dm in cathode current density
2, temperature is electrodepositing zinc iron alloy 40min under 25 ℃ the condition, after the galvanic deposit workpiece taken out, and washing, (the passivation technology condition was: CrCl in 30 seconds in passivation
36H
2O 16g/L, NH
4HF
21.5g/L, ZnCl
20.5g/L, NaNO
38g/L, pH1.8,30 ℃ of temperature), washing, air-dry, 75 ℃ aging 20 minutes down, make the bright corrosion resisting zinc-iron alloy layer that thickness is about 8 microns.The iron amount is about 17.5% in the gained zinc-iron alloy after testing, and coating surface is the minute surface light; The technology cathode efficiency is 91%.
Contrast test
The zinc-iron alloy that example 1 is obtained is designated as the Zn-17.5Fe alloy layer, itself and Zn coating are done the contrast test, wherein the processing condition of Zn coating are: ZnO10g/L, NaOH130g/L, the synthetics of dimethylamine and epoxy chloropropane (DE) 4mL/L, ethylenediamine tetraacetic acid (EDTA) 0.8mL/L, Vanillin 0.04g/L, cathode current density 1A/dm
2, 28 ℃ of temperature, anode is a zine plate.Observe the coating microscopic appearance with SEM, adopt the solidity to corrosion of electro-chemical test, salt air corrosion experimental evaluation coating surface passivation film.
Zn coating and Zn-17.5Fe alloy layer to not passivation are done sem analysis, the results are shown in Figure 1 and Fig. 2.Wherein Fig. 1 is the microscopic appearance of zinc coating, and Fig. 2 is the microscopic appearance of Zn-17.5Fe alloy layer.Compare with Zn coating as we know from the figure, the Zn-17.5Fe alloy layer is more smooth, and crystal grain is more tiny, and intercrystalline is in conjunction with more tight.
Electrochemical tests after Zn coating and the passivation of Zn-17.5Fe alloy layer more as shown in Figure 3, table 1 is corresponding electrochemical polarization parameter, wherein Zn coating is to carry out white passivation in the 2g/L sodium dichromate solution, temperature is 30 ℃, passivation time 30 seconds, sky stopped 20 seconds, washing, air-dry, 50～60 ℃ were worn out 15 minutes.From Fig. 3 and table 1 as can be seen, compare with zinc coating, Zn-17.5Fe alloy layer corrosion potential is just in Zn coating, still is anodic coating but compare with iron and steel, and the Zn-17.5Fe alloy layer is compared with Zn coating has bigger polarization resistance and littler corrosion current.Show that Zn-17.5Fe after the passivation compares with Zn coating and has higher solidity to corrosion.
Table 1 Zn and the Electrochemical results of Zn-17.5Fe alloy layer in 5%NaCl solution
| Steel | E corr/V | R p/kΩ·cm -2 | I corr/μA·cm 2 |
| Zn | -1.017 | 31.5 | 0.215 |
| Zn-17.5Fe | -0.889 | 90.1 | 0.092 |
Adopt Zn-17.5Fe alloy layer and Zn coating passivation film corrosion resistance nature after the salt spray corrosion test method is estimated passivation, the processing condition that Zn coating is obtained and last same.YWX/Q-150 type salt fog cabinet is adopted in test, spraying continuously, and etchant solution is the 5%NaCl aqueous solution, the pH value of solution is 6.5～7.2, salt fog the temperature inside the box is 35 ± 2 ℃, relative humidity〉95%, the size of spray amount is 1～2mL/ (80cm
2H).The used time of 5% white rust occurs with coating surface and estimate the solidity to corrosion of coating, the results are shown in Figure 4.Zn coating, Zn-17.5Fe 5% white rust time occurred for and are respectively 37h, 65h as can be known from Fig. 4, showed that Zn-17.5Fe alloy layer solidity to corrosion is better than Zn coating about 75%.
Anode is a stainless steel, and specification is 50mm * 40mm * 1mm.Negative electrode is the Q235 steel plate, and specification is 40mm * 30mm * 1mm.
(1) configuration zinc-iron alloy plating bath: preparation 1000mL plating bath, plating bath consists of: ZnO 8g, NaOH 100g, trolamine 20mL, FeSO
47H
2O 7g, the synthetics of dimethylamine and epoxy chloropropane (DE) 2mL, ethylenediamine tetraacetic acid (EDTA) 1g, Vanillin 0.02g, sodium laurylsulfonate 0.04g, Zn powder 1g.In coating bath, add 300mL water, solid NaOH is poured in the water, after the stirring and dissolving,, under agitation add NaOH solution the ZnO of furnishing pasty state.Add water to 600mL Deng fully after the dissolving, add 1g Zn powder, stirred 25 minutes, again clarification filtration.In a beaker, after usefulness 200mL water dilutes trolamine, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics (DE), ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then, and stirring makes its dissolving.Again with sodium laurylsulfonate with a spot of water heating for dissolving, join after the cooling in the plating bath, add water to 1000mL.Continuing to stir mixes plating bath.
(2) steel pre-treatment: with sand paper steel surface is polished, be respectively 4% NaOH, 5% Na in the constituent weight percent concentration
2CO
3With in 0.5% the OP emulsifier mix aqueous solution steel are carried out electrochemical deoiling; With temperature is that 70 ℃ of clear water are washed steel; Be respectively 10% H with the constituent weight percent concentration
2SO
4With under 0.1% the thiocarbamide mixed aqueous solution room temperature steel are carried out acid pickling and rust removing; With clear water steel part is washed again; In temperature is to activate 40 seconds 40 ℃ contain in HCl 3% (weight) solution; Wash with water again.
(3) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 2A/dm in cathode current density
2, temperature is electrodepositing zinc iron alloy 30min under 35 ℃ the condition, after the galvanic deposit workpiece taken out, and washing, (the passivation technology condition was: CrCl in 30 seconds in passivation
36H
2O 16g/L, NH
4HF
21.5g/L, ZnCl
20.5g/L, NaNO
38g/L, pH1.8,30 ℃ of temperature), washing, air-dry, 75 ℃ aging 20 minutes down, make the bright corrosion resisting zinc-iron alloy layer that thickness is about 7 microns.The iron amount is about 18.1% in the gained zinc-iron alloy after testing, and coating surface is the minute surface light; The technology cathode efficiency is 85%.
Embodiment 3
Anode is a stainless steel, and specification is 50mm * 40mm * 1mm.Negative electrode is the Q235 steel plate, and specification is 40mm * 30mm * 1mm.
(1) configuration zinc-iron alloy plating bath: preparation 1000mL plating bath, plating bath consists of: ZnO 6g, NaOH 150g, trolamine 50mL, FeSO
47H
2O 13g, the synthetics of dimethylamine and epoxy chloropropane (DE) 6mL, ethylenediamine tetraacetic acid (EDTA) 0.6g, Vanillin 0.1g, sodium laurylsulfonate 0.1g, Zn powder 2g.In coating bath, add 500mL water, solid NaOH is poured in the water, after the stirring and dissolving,, under agitation add NaOH solution the ZnO of furnishing pasty state.Add water to 800mL Deng fully after the dissolving, add 2g Zn powder, stirred 30 minutes, again clarification filtration.In a beaker, after usefulness 200mL water dilutes trolamine, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics (DE), ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then, and stirring makes its dissolving.Again with sodium laurylsulfonate with a spot of water heating for dissolving, join after the cooling in the plating bath, add water to 1000mL.Continuing to stir mixes plating bath.
(2) steel pre-treatment: with sand paper steel surface is polished, be respectively 3% NaOH, 4% Na in the constituent weight percent concentration
2CO
3With in 0.6% the OP emulsifier mix aqueous solution steel are carried out electrochemical deoiling; With temperature is that 75 ℃ of clear water are washed steel; Be respectively 15% H with the constituent weight percent concentration
2SO
4With under 0.25% the thiocarbamide mixed aqueous solution room temperature steel are carried out acid pickling and rust removing; With clear water steel part is washed again; In temperature is to activate 20 seconds 35 ℃ contain in HCl 5% (weight) solution; Wash with water again.
(3) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 3A/dm in cathode current density
2, temperature is electrodepositing zinc iron alloy 60min under 20 ℃ the condition, after the galvanic deposit workpiece taken out, and washing, (the passivation technology condition was: CrCl in 30 seconds in passivation
36H
2O 16g/L, NH
4HF
21.5g/L, ZnCl
20.5g/L, NaNO
38g/L, pH1.8,30 ℃ of temperature), washing, air-dry, 75 ℃ aging 20 minutes down, make the bright corrosion resisting zinc-iron alloy layer that thickness is about 11 microns.The iron amount is about 19.5% in the gained zinc-iron alloy after testing, and coating surface is the minute surface light; The technology cathode efficiency is 90%.
Anode is a stainless steel, and specification is 50mm * 40mm * 1mm.Negative electrode is the Q235 steel plate, and specification is 40mm * 30mm * 1mm.
(1) configuration zinc-iron alloy plating bath: preparation 1000mL plating bath, plating bath consists of: ZnO 12g, NaOH 90g, trolamine 35mL, FeSO
47H
2O 5g, the synthetics of dimethylamine and epoxy chloropropane (DE) 8mL, ethylenediamine tetraacetic acid (EDTA) 0.5g, Vanillin 0.08g, sodium laurylsulfonate 0.06g, Zn powder 1.5g.In coating bath, add 450mL water, solid NaOH is poured in the water, after the stirring and dissolving,, under agitation add NaOH solution the ZnO of furnishing pasty state.Add water to 750mL Deng fully after the dissolving, add 1.5g Zn powder, stirred 35 minutes, again clarification filtration.In a beaker, after usefulness 200mL water dilutes trolamine, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics (DE), ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then, and stirring makes its dissolving.Again with sodium laurylsulfonate with a spot of water heating for dissolving, join after the cooling in the plating bath, add water to 1000mL.Continuing to stir mixes plating bath.
(2) steel pre-treatment: with sand paper steel surface is polished, be respectively 7% NaOH, 3% Na in the constituent weight percent concentration
2CO
3With in 0.4% the OP emulsifier mix aqueous solution steel are carried out electrochemical deoiling; With temperature is that 90 ℃ of clear water are washed steel; Be respectively 12% H with the constituent weight percent concentration
2SO
4With under 0.3% the thiocarbamide mixed aqueous solution room temperature steel are carried out acid pickling and rust removing; With clear water steel part is washed again; In temperature is to activate 60 seconds 20 ℃ contain in HCl 3% (weight) solution; Wash with water again.
(3) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 0.5A/dm in cathode current density
2, temperature is electrodepositing zinc iron alloy 20min under 40 ℃ the condition, after the galvanic deposit workpiece taken out, and washing, (the passivation technology condition was: CrCl in 30 seconds in passivation
36H
2O 16g/L, NH
4HF
21.5g/L, ZnCl
20.5g/L, NaNO
38g/L, pH1.8,30 ℃ of temperature), washing, air-dry, 75 ℃ aging 20 minutes down, make the bright corrosion resisting zinc-iron alloy layer that thickness is about 6 microns.The iron amount is about 17.2% in the gained zinc-iron alloy after testing, and coating surface is the minute surface light; The technology cathode efficiency is 88%.
Claims (3)
1, a kind of bright corrosion resisting zinc-iron alloy plating process is characterized in that comprising the steps and processing condition:
(1) configuration zinc-iron alloy plating bath: the zinc-iron alloy plating bath is the aqueous solution, and its constituent concentration is ZnO 6～12g/L, NaOH 90～150g/L, trolamine 20～50mL/L, FeSO
47H
2O 5～13g/L, the synthetics 2～8mL/L of dimethylamine and epoxy chloropropane, ethylenediamine tetraacetic acid (EDTA) 0.5～1g/L, Vanillin 0.02～0.1g/L, sodium laurylsulfonate 0.02～0.1g/L, Zn powder 1～2g/L;
(2) electroplating zinc-iron alloy: the zinc-iron alloy plating bath that pretreated steel are put into step (1) preparation is anode as negative electrode with the stainless steel, is 0.5～3A/dm in cathode current density
2, temperature is an electrodepositing zinc iron alloy 20～60 minutes under 20～40 ℃ the condition, after the galvanic deposit workpiece is taken out, successively through washing, passivation, washing, air-dry and aging once more make the bright corrosion resisting zinc-iron alloy.
2, bright corrosion resisting zinc-iron alloy plating process according to claim 1 is characterized in that: described pre-treatment is with sand paper steel surface to be polished; In alkaline mixed aqueous solution steel are carried out electrochemical deoiling and handle, the component of described alkaline mixed aqueous solution and weight concentration thereof are: 3%～7% NaOH, 3%～7% Na
2CO
3With 0.4%～0.7% OP emulsifying agent; With 70～90 ℃ of clear water of temperature steel are washed; In weight concentration 10%～15% H
2SO
4With in 0.1%～0.3% the sulphur urine mixed aqueous solution steel are carried out acid pickling and rust removing; With clear water steel are washed again; In temperature is 20～40 ℃ the aqueous solution that contains HCl 3%～5% (weight), activate 20～60 seconds, wash with water again.
3, bright corrosion resisting zinc-iron alloy plating process according to claim 1, the collocation method that it is characterized in that described zinc-iron alloy plating bath is: according to the requirement of constituent concentration in the zinc-iron alloy plating bath aqueous solution, the water that in coating bath, adds zinc-iron alloy plating bath cumulative volume 30%～50%, solid NaOH is poured in the water, after the stirring and dissolving, ZnO with the furnishing pasty state, under agitation add NaOH solution, add water to 60%～80% of zinc-iron alloy plating bath cumulative volume Deng fully after the dissolving, the Zn powder is added, stirred 25～35 minutes, again clarification filtration; In another container, with an amount of water with the dilution of the trolamine that measures after, with FeSO
47H
2O under agitation adds, and dissolving back adds coating bath fully, successively synthetics, ethylenediamine tetraacetic acid (EDTA), the Vanillin of dimethylamine and epoxy chloropropane is joined in the coating bath then; With a spot of water heating for dissolving, join in the plating bath after the cooling sodium laurylsulfonate; The water that adds surplus in the proportioning continues stirring plating bath is mixed.
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| CN109642337B (en) * | 2016-05-24 | 2021-07-13 | 科文特亚股份有限公司 | Ternary zinc-nickel-iron alloy and alkaline electrolyte for electroplating such an alloy |
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| CN111593380A (en) * | 2020-06-30 | 2020-08-28 | 武汉钢铁有限公司 | Acidic electro-galvanized iron alloy plating solution additive for high-iron-content plating layer and application method thereof |
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