CN104962975A - Salt-fog-resistant galvanizing blackening process - Google Patents
Salt-fog-resistant galvanizing blackening process Download PDFInfo
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- CN104962975A CN104962975A CN201510382455.9A CN201510382455A CN104962975A CN 104962975 A CN104962975 A CN 104962975A CN 201510382455 A CN201510382455 A CN 201510382455A CN 104962975 A CN104962975 A CN 104962975A
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Abstract
The invention relates to a salt-fog-resistant galvanizing blackening process. The salt-fog-resistant galvanizing blackening process comprises the steps of surface treatment, galvanizing, alkaline washing, glaring, passivating, sealing and drying, wherein in the passivating step, a used solution contains 180 to 220 ml/L of trivalent chromium zinc black passivating agent, the PH value is 1.5 to 2.2, the treatment temperature is 20 to 45 DEG C, and the treatment time is 15 to 40 s; the sealing step comprises a primary sealing step and a high-corrosion-resistant black sealing step, wherein the primary sealing step is to immersing a passivated base material in 150 to 200 ml/L of sealing agent, adjusting the temperature to 40 to 50 DEG C, and adjusting the PH value to 4 to 5, wherein the treatment time is 8 to 12 s; the high-corrosion-resistant black sealing step is to immerse a base material integrally in a high-corrosion-resistnat black sealing agent, and then immediately taking out the base material. By adopting the salt-fog-resistant galvanizing blackening process, the passivation treatment time is short, the reaction condition is moderate and rapid, the processing time is low, the surface after the high-corrosion-resistant black sealing is more compact, and an obtained product can be rustless in a salt fog experiment for 96 hours.
Description
Technical field
The present invention relates to field of metal surface treatment technology, particularly a kind of zincincation improving coating salt fog resistance performance.
Background technology
Zinc, due to easily passivation and form protective membrane at normal temperatures, prevents further oxidation, is the method for metal or alloy in conventional protective coating so zinc-plated.But can electrolyte solution be formed on the surface of zinc coating under the wet environment of acidity, thus easily galvanic corrosion occur and produce white rust, once galvanic corrosion produces, then the provide protection of coating will be lost efficacy very soon.No matter how thick common zinc coating is, can only reach 24 hours without white rust in salt-fog test, is difficult to the salt mist environment tolerating the longer time; And thicken thickness of coating product use properties also can be caused to reduce, be not suitable for the application of a lot of occasion.
Therefore, be necessary to provide a kind of new technique to improve the salt fog resistance performance of zinc coating.
Summary of the invention
Main purpose of the present invention is to provide a kind of zincincation improving coating salt fog resistance performance.
The present invention is achieved through the following technical solutions above-mentioned purpose: the zinc-plated black-labour skill of a kind of salt fog resistance, step comprises surface treatment, zinc-plated, alkali cleaning, bright dipping, passivation, closes and dry, the solution adopted in described passivation step is containing trivalent chromium zinc black passivator 180-220ml/L, pH value 1.5-2.2, treatment temp 20-45 DEG C, treatment time 15-40s; Described closing comprises preliminary closing and closed two steps of high corrosion resistant black, preliminary step of closing is that passivation ground is immersed encapsulant 150-200ml/L, temperature regulating 40-50 DEG C, pH value 4-5, treatment time 8-12s, high corrosion resistant black is closed step and is taken out immediately after ground entirety is immersed uniform high corrosion resistant black encapsulant.
Concrete, described trivalent chromium zinc black passivator is YQL-HZ02 type passivator.
Concrete, described encapsulant is YQL-HZ03 type encapsulant.
Concrete, described high corrosion resistant black encapsulant is YQL-HZ09A type encapsulant.
Further, the YQL-HZ09B type adjusting agent of 50% is also comprised in described high corrosion resistant black encapsulant.
Concrete, the electroplate liquid chloride containing potassium 180-220g/L adopted in described zinc-plated step, zinc chloride 40-50g/L, boric acid 25-35g/L, gloss-imparting agent 90-120ml/1000Ah, softening agent 450-550ml/1000Ah, pH value is 5-6, and electric current is 0.29-0.31A/dm
2, treatment temp is 10-35 DEG C, and the time is 110-160min.
Concrete, adopt the sodium hydroxide solution of quality accounting 6-10% in described caustic scrubbing step, treatment time 12-40s.
Concrete, adopt the nitric acid of quality accounting 0.25-0.35% in described bright dipping step, treatment time 5-10s.
Further, after described zinc-plated, alkali cleaning and bright dipping step, ground all cleans with water.
Concrete, described baking step temperature is 80 DEG C, and the treatment time is 1h.
Compared with prior art, the beneficial effect of salt fog resistance of the present invention zinc-plated black-labour skill is: the Passivation Treatment time of the present invention is short, and reaction conditions is fast gentle, and tooling cost is low, high corrosion resistant black close after top layer finer and close, it is rustless that the product of acquisition can reach salt mist experiment more than 96 hours.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
The zinc-plated black-labour skill of a kind of salt fog resistance, step comprises surface treatment, zinc-plated, alkali cleaning, bright dipping, passivation, closes and dry, and the solution adopted in described passivation step is containing trivalent chromium zinc black passivator 180-220ml/L, pH value 1.5-2.2, treatment temp 20-45 DEG C, treatment time 15-40s; Described closing comprises preliminary closing and closed two steps of high corrosion resistant black, and preliminary step of closing is that passivation ground is immersed encapsulant 150-200ml/L, temperature regulating 40-50 DEG C, pH value 4-5, treatment time 8-12s; High corrosion resistant black is closed step and is taken out immediately after ground entirety is immersed high corrosion resistant black encapsulant.
Agents useful for same of the present invention provides by Kunshan Yong Qili International Trading Company Ltd.
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1:
1) zinc-plated: the ground after surface treatment is placed in chloride containing potassium 180g/L, zinc chloride 40g/L, boric acid 35g/L, gloss-imparting agent 7ml, softening agent 35ml, PH be the solution of 5, ground is that negative electrode passes into electric current 29A/dm
2, at 35 DEG C of temperature, process 160min, then clean with pure water;
2) alkali cleaning: the sodium hydroxide solution that zinc-plated ground is placed in quality accounting 6% is cleaned 12s, then cleans with tap water;
3) bright dipping: the zinc-plated ground after alkali cleaning is placed in quality accounting 0.25% nitric acid and processes 5s, then clean with tap water;
4) passivation: the YQL-HZ02 type trivalent chromium zinc black passivator ground after bright dipping being placed in 180ml/L, processes 40s at pH value 1.5, temperature 20 DEG C;
5) tentatively closed: ground is immersed 40 DEG C, pH value 4, concentration 150ml/L YQL-HZ03 type encapsulant in process 12s;
6) high corrosion resistant black is closed: ground entirety immersed after in uniform YQL-HZ09A type encapsulant and YQL-HZ09B type adjusting agent 1:1 mixed solution and take out immediately;
7) dry: after the zinc-plated ground after closing is dewatered in water extracter, dry 1h at 80 DEG C of temperature after.
In the present embodiment technique, the Passivation Treatment time is short, and reaction conditions is gentle, and tooling cost is low fast, high corrosion resistant black close after top layer finer and close, it is rustless that the product of acquisition can reach salt mist experiment more than 96 hours.
Embodiment 2:
1) zinc-plated: the ground after surface treatment is placed in chloride containing potassium 220g/L, zinc chloride 50g/L, boric acid 25g/L, gloss-imparting agent 6.8ml, softening agent 31ml, PH be the solution of 6, ground is that negative electrode passes into electric current 31A/dm
2, process 110min at normal temperatures, then clean with pure water;
2) alkali cleaning: the sodium hydroxide solution that zinc-plated ground is placed in quality accounting 10% is cleaned 40s, then cleans with tap water;
3) bright dipping: the zinc-plated ground after alkali cleaning is placed in quality accounting 0.35% nitric acid and processes 10s, then clean with tap water;
4) passivation: the YQL-HZ02 type trivalent chromium zinc black passivator ground after bright dipping being placed in 190ml/L, processes 34s at pH value 1.8, temperature 30 DEG C;
5) tentatively closed: ground is immersed 42 DEG C, pH value 5, concentration 170ml/L YQL-HZ03 type encapsulant in process 10s;
6) high corrosion resistant black is closed: ground entirety immersed after in uniform YQL-HZ09A type encapsulant and YQL-HZ09B type adjusting agent 1:1 mixed solution and take out immediately;
7) dry: after the zinc-plated ground after closing is dewatered in water extracter, dry 1h at 80 DEG C of temperature after.
In the present embodiment technique, the Passivation Treatment time is short, and reaction conditions is gentle, and tooling cost is low fast, high corrosion resistant black close after top layer finer and close, it is rustless that the product of acquisition can reach salt mist experiment more than 96 hours.
Embodiment 3:
1) zinc-plated: the ground after surface treatment is placed in chloride containing potassium 200g/L, zinc chloride 46g/L, boric acid 30g/L, gloss-imparting agent 7.5ml, softening agent 37.5ml, PH be the solution of 6, ground is that negative electrode passes into electric current 30A/dm
2, process 150min at normal temperatures, then clean with pure water;
2) alkali cleaning: the sodium hydroxide solution that zinc-plated ground is placed in quality accounting 9% is cleaned 30s, then cleans with tap water;
3) bright dipping: the zinc-plated ground after alkali cleaning is placed in quality accounting 0.4% nitric acid and processes 30s, then clean with tap water;
4) passivation: the YQL-HZ02 type trivalent chromium zinc black passivator ground after bright dipping being placed in 200ml/L, processes 24s at pH value 2, temperature 38 DEG C;
5) tentatively closed: ground is immersed 48 DEG C, pH value 4.5, concentration 180ml/L YQL-HZ03 type encapsulant in process 8s;
6) high corrosion resistant black is closed: ground entirety immersed after in uniform YQL-HZ09A type encapsulant and YQL-HZ09B type adjusting agent 1:1 mixed solution and take out immediately;
7) dry: after the zinc-plated ground after closing is dewatered in water extracter, dry 1h at 80 DEG C of temperature after.
In the present embodiment technique, the Passivation Treatment time is short, and reaction conditions is gentle, and tooling cost is low fast, nanometer close after top layer finer and close, it is rustless that the product of acquisition can reach salt mist experiment more than 96 hours.
Embodiment 4:
1) zinc-plated: the ground after surface treatment is placed in chloride containing potassium 200g/L, zinc chloride 46g/L, boric acid 30g/L, gloss-imparting agent 6.6ml, softening agent 28ml, PH be the solution of 6, ground is that negative electrode passes into electric current 30A/dm
2, process 120min at normal temperatures, then clean with pure water;
2) alkali cleaning: the sodium hydroxide solution that zinc-plated ground is placed in quality accounting 9% is cleaned 30s, then cleans with tap water;
3) bright dipping: the zinc-plated ground after alkali cleaning is placed in quality accounting 0.4% nitric acid and processes 30s, then clean with tap water;
4) passivation: the YQL-HZ02 type trivalent chromium zinc black passivator ground after bright dipping being placed in 220ml/L, processes 15s under pH value 2.2, temperature 45 C;
5) tentatively closed: ground is immersed 50 DEG C, pH value 5, concentration 200ml/L YQL-HZ03 type encapsulant in process 11s;
6) high corrosion resistant black is closed: ground entirety immersed after in uniform YQL-HZ09A type encapsulant and YQL-HZ09B type adjusting agent 1:1 mixed solution and take out immediately;
7) dry: after the zinc-plated ground after closing is dewatered in water extracter, dry 1h at 80 DEG C of temperature after.
In the present embodiment technique, the Passivation Treatment time is short, and reaction conditions is gentle, and tooling cost is low fast, nanometer close after top layer finer and close, it is rustless that the product of acquisition can reach salt mist experiment more than 96 hours.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (9)
1. the zinc-plated black-labour skill of salt fog resistance, step comprises surface treatment, zinc-plated, alkali cleaning, bright dipping, passivation, closes and dry, it is characterized in that: the solution adopted in described passivation step is containing trivalent chromium zinc black passivator 180-220ml/L, pH value 1.5-2.2, treatment temp 20-45 DEG C, treatment time 15-40s; Described closing comprises preliminary closing and closed two steps of high corrosion resistant black, and preliminary step of closing is that passivation ground is immersed encapsulant 150-200ml/L, temperature regulating 40-50 DEG C, pH value 4-5, treatment time 8-12s; High corrosion resistant black is closed step and is taken out immediately after ground entirety is immersed high corrosion resistant black encapsulant.
2. the zinc-plated black-labour skill of salt fog resistance according to claim 1, is characterized in that: described trivalent chromium zinc black passivator is YQL-HZ02 type passivator.
3. the zinc-plated black-labour skill of salt fog resistance according to claim 1, is characterized in that: described encapsulant is YQL-HZ03 type encapsulant.
4. the zinc-plated black-labour skill of salt fog resistance according to claim 1, is characterized in that: described high corrosion resistant black encapsulant is the 1:1 mixed solution of YQL-HZ09A type encapsulant and YQL-HZ09B type adjusting agent.
5. the zinc-plated black-labour skill of salt fog resistance according to claim 1, it is characterized in that: the electroplate liquid chloride containing potassium 180-220g/L adopted in described zinc-plated step, zinc chloride 40-50g/L, boric acid 25-35g/L, gloss-imparting agent 90-120ml/1000Ah, softening agent 450-550ml/1000Ah, pH value is 5-6, and electric current is 0.29-0.31A/dm
2, treatment temp is 10-35 DEG C, and the time is 110-160min.
6. the zinc-plated black-labour skill of salt fog resistance according to claim 1, is characterized in that: the sodium hydroxide solution adopting quality accounting 6-10% in described caustic scrubbing step, treatment time 12-40s.
7. the zinc-plated black-labour skill of salt fog resistance according to claim 1, is characterized in that: the nitric acid adopting quality accounting 0.25-0.35% in described bright dipping step, treatment time 5-10s.
8. according to the arbitrary described zinc-plated black-labour skill of salt fog resistance of claim 1-7, it is characterized in that: after described zinc-plated, alkali cleaning and bright dipping step, ground all cleans with water.
9. the zinc-plated black-labour skill of salt fog resistance according to claim 1, it is characterized in that: described baking step temperature is 80 DEG C, the treatment time is 1h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106757281A (en) * | 2016-12-29 | 2017-05-31 | 广东工业大学 | A kind of protective agent composition and anticorrosive bonding wire and preparation method thereof |
| CN109385649A (en) * | 2018-12-24 | 2019-02-26 | 陕西航天时代导航设备有限公司 | A kind of crisp acid cyanideless electro-plating zinc technology method of low hydrogen |
| CN109881228A (en) * | 2019-03-27 | 2019-06-14 | 珠海市玛斯特锌镍加工有限公司 | A kind of closing process of part |
| CN112267108A (en) * | 2020-09-17 | 2021-01-26 | 苏州汇铭源工业零部件有限公司 | Method for improving corrosion resistance of stainless steel fastener |
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| US5820741A (en) * | 1995-12-05 | 1998-10-13 | Sanchem, Inc. | Passification of zinc surfaces |
| RO115889B1 (en) * | 1998-08-07 | 2000-07-28 | Sc Stibro 2000 Sa | Solution for black passivation of zinc coatings |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106757281A (en) * | 2016-12-29 | 2017-05-31 | 广东工业大学 | A kind of protective agent composition and anticorrosive bonding wire and preparation method thereof |
| CN106757281B (en) * | 2016-12-29 | 2019-04-09 | 广东工业大学 | A kind of protective agent composition and anticorrosive bonding wire and preparation method thereof |
| CN109385649A (en) * | 2018-12-24 | 2019-02-26 | 陕西航天时代导航设备有限公司 | A kind of crisp acid cyanideless electro-plating zinc technology method of low hydrogen |
| CN109881228A (en) * | 2019-03-27 | 2019-06-14 | 珠海市玛斯特锌镍加工有限公司 | A kind of closing process of part |
| CN112267108A (en) * | 2020-09-17 | 2021-01-26 | 苏州汇铭源工业零部件有限公司 | Method for improving corrosion resistance of stainless steel fastener |
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Application publication date: 20151007 |