CN104342667A - A preparing method of an electrogalvanized surface passivating solution for a steel plate - Google Patents

A preparing method of an electrogalvanized surface passivating solution for a steel plate Download PDF

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Publication number
CN104342667A
CN104342667A CN201310312750.8A CN201310312750A CN104342667A CN 104342667 A CN104342667 A CN 104342667A CN 201310312750 A CN201310312750 A CN 201310312750A CN 104342667 A CN104342667 A CN 104342667A
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CN
China
Prior art keywords
deionized water
acid
stirring
add
steel plate
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Pending
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CN201310312750.8A
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Chinese (zh)
Inventor
庄进
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WUXI SHITANGWAN INDUSTRIAL PARK DEVELOPMENT CONSTRUCTION Co Ltd
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WUXI SHITANGWAN INDUSTRIAL PARK DEVELOPMENT CONSTRUCTION Co Ltd
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Priority to CN201310312750.8A priority Critical patent/CN104342667A/en
Publication of CN104342667A publication Critical patent/CN104342667A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

A preparing method of an electrogalvanized surface passivating solution for a steel plate is disclosed. The preparing method includes: 1) adding a proper amount of deionized water into an acid-proof container, adding 24-26 mL/L of sulfuric acid having a concentration of 70% and 20-22 mL/L of nitric acid having a concentration of 68%, stirring uniformly, adding 16-20 g/L of zinc nitrite and 26-28 g/L of calcium silicate in sequence, and stirring for 10-14 min; 2) adding a proper amount of deionized water into another container, adding 8-10 g/L of boric acid and 2-4 g/L of citric acid, stirring uniformly, adding 6-8 g/L of sodium fluoborate and 12-14 g/L of sodium peroxide in sequence, and stirring for 10-14 min; and 3) adding the solution prepared in the step 2) into the solution prepared in the step 1), stirring uniformly, adding 3-5 g/L of magnesium dodecyl sulfate and 4-6 g/L of alkyl polyoxyethylene ether, with the balance being deionized water, and stirring for 20-30 min.

Description

A kind of compound method of steel plate electro-galvanizing surface passivation liquid
Technical field
The present invention relates to technical field of surface, particularly relate to a kind of compound method of steel plate electro-galvanizing surface passivation liquid.
Background technology
Material corrosion and material antiseptic engineering, be directly connected to the life security of expanding economy and the people, and surface engineering technology solves component of machine and material corrosion and the most economical effective measure of protection.
Electro-galvanizing is the effective way improving steel material surface resistance to corrosion, is widely used at present in many fields such as building, traffic, machinery, electronics, aviation.But in a humid environment, especially in hygrothermal environment, zinc coating easily corrodes, coating surface is made to form corrosion product---the white rust of lead or white loose; Time has been grown and there will be red rust, thus loses preservative effect.In order to improve the solidity to corrosion of coating, after steel material surface electro-galvanizing, then Passivation Treatment must be carried out to coating, to form fine and close passive film at Several Thiourea Derivatives on Zinc Plate Surface, thus improving the solidity to corrosion of material further, extending the work-ing life of material.
The solution that zinc-plating material nearly all is at present main component as the aftertreatment technology of galvanized sheet etc. all adopts with sexavalent chrome or trivalent chromium carries out Passivation Treatment, because sexavalent chrome toxicity is high and easily carcinogenic, national governments strictly limit it and use and discharge, in RoHS Directive, especially clearly prohibit the use any part through the process of sexavalent chrome passivating technique and product; Although trivalent chromium passivation process is more much smaller than chromic contaminative, but through the zinc-plating material of trivalent chromium passivation through still can sexavalent chrome be oxidized to after a period of time, that is really chromic toxicity problem is not solved in fact, so a lot of countries and regions also start restriction use trivalent chromium passivation process.Therefore, the chromium-free passivation liquid that exploitation meets environmental requirement must become development trend from now on.The domestic and international research for Unchromium Passivation of Galvanized Zinc Layer liquid at present mainly contains molybdate system, titanium salt system, rare-earth system, silicate systems, phytic acid system and organic-compound system etc., but does not also have a kind of chromium-free passivation liquid can replace tradition completely containing chromium passivating liquid in production at present.Molybdate passivating liquid can form multiple color passive film, but solidity to corrosion is poor, efficiency is low, cost is high, difficult in maintenance, and molybdenum and chromium of the same clan, still have pollution problem.Titanium salt passivating solution can provide good solidity to corrosion, but cost is too high, and film forming efficiency needs to improve further.Rare earth passivating solution also can form the passive film of excellent corrosion resistance, but film forming efficiency is too low, and generally taking passivation just can reach performance requriements in 1 ~ 2 day, and only needs 5 ~ 30 seconds containing chromium passivating.Phytic acid and the organism passivating solution feature of environmental protection good, heavy metal free ion processing problem, but film forming bright property and erosion resistance poor, cost is high, difficult in maintenance.
Summary of the invention
The object of the invention is to the compound method proposing a kind of steel plate electro-galvanizing surface passivation liquid, this passivating solution, without trivalent chromium and sexavalent chrome, thoroughly overcomes the environmental pollution defect of chromium, and the passive film simultaneously adopting this passivating solution to prepare possesses again good corrosion resistance nature.
For reaching this object, the present invention by the following technical solutions:
A compound method for steel plate electro-galvanizing surface passivation liquid, consisting of of this passivating solution: zinc nitrate 16-20g/L, Calucium Silicate powder 26-28g/L, boric acid 8-10g/L, sodium peroxide 12-14g/L, Sodium tetrafluoroborate 6-8g/L, citric acid 2-4g/L, 68%HNO 320-22ml/L, 70%H 2sO 424-26ml/L, Stepanol MG 3-5g/L, fatty alcohol-polyoxyethylene ether 4-6g/L, surplus is deionized water; Described compound method is:
1) get acid-resistant container, add appropriate amount of deionized water, then add sulfuric acid and nitric acid, after stirring, add zinc nitrate and Calucium Silicate powder successively, stir 10-14 minute;
2) get another one container again, add appropriate amount of deionized water, add boric acid and citric acid, after stirring, add Sodium tetrafluoroborate and sodium peroxide successively; Stir 10-14 minute;
3) by step 2) solution prepared joins in solution prepared by step 1), adds the deionized water of Stepanol MG, fatty alcohol-polyoxyethylene ether and surplus again, stir 20-30 minute after stirring.
The invention has the beneficial effects as follows:
The passivating solution that the present invention adopts may be used for the postorder Passivation Treatment of electrogalvanizing steel plate, the coating surface of zinc-plating material can be made to form even, the fine and close passive film of one deck, significantly improve the solidity to corrosion of steel plate galvanized, through salt-fog test, the rust time reaches more than 130 hours, all can reach the existing effect containing chromium passivating technique in outward appearance and aspect of performance.In addition, owing to not containing sexavalent chrome and trivalent chromium in passivating solution of the present invention, fundamentally solve the existing problem containing chromium passivating process contamination environment, nor containing heavy metal ion such as other any Ag, Cu, Pb, Ni to human body and bad environmental, meet the environmental protection standards such as China's national sewage comprehensive emission standard (GB8978-1996) and RoHS Directive completely.
Embodiment
Embodiment one
A compound method for steel plate electro-galvanizing surface passivation liquid, consisting of of this passivating solution: zinc nitrate 16g/L, Calucium Silicate powder 28g/L, boric acid 8g/L, sodium peroxide 14g/L, Sodium tetrafluoroborate 6g/L, citric acid 4g/L, 68%HNO 320ml/L, 70%H 2sO 426ml/L, Stepanol MG 3g/L, fatty alcohol-polyoxyethylene ether 6g/L, surplus is deionized water; Described compound method is:
1) get acid-resistant container, add appropriate amount of deionized water, then add sulfuric acid and nitric acid, after stirring, add zinc nitrate and Calucium Silicate powder successively, stir 10 minutes;
2) get another one container again, add appropriate amount of deionized water, add boric acid and citric acid, after stirring, add Sodium tetrafluoroborate and sodium peroxide successively; Stir 10 minutes;
3) by step 2) solution prepared joins in solution prepared by step 1), adds the deionized water of Stepanol MG, fatty alcohol-polyoxyethylene ether and surplus again, stir 20 minutes after stirring.
Embodiment two
A compound method for steel plate electro-galvanizing surface passivation liquid, consisting of of this passivating solution: zinc nitrate 20g/L, Calucium Silicate powder 26g/L, boric acid 10g/L, sodium peroxide 12/L, Sodium tetrafluoroborate 8g/L, citric acid 2g/L, 68%HNO 322ml/L, 70%H 2sO 424ml/L, Stepanol MG 5g/L, fatty alcohol-polyoxyethylene ether 4g/L, surplus is deionized water; Described compound method is:
1) get acid-resistant container, add appropriate amount of deionized water, then add sulfuric acid and nitric acid, after stirring, add zinc nitrate and Calucium Silicate powder successively, stir 14 minutes;
2) get another one container again, add appropriate amount of deionized water, add boric acid and citric acid, after stirring, add Sodium tetrafluoroborate and sodium peroxide successively; Stir 14 minutes;
3) by step 2) solution prepared joins in solution prepared by step 1), adds the deionized water of Stepanol MG, fatty alcohol-polyoxyethylene ether and surplus again, stir 30 minutes after stirring.
Embodiment three
A compound method for steel plate electro-galvanizing surface passivation liquid, consisting of of this passivating solution: zinc nitrate 18g/L, Calucium Silicate powder 27g/L, boric acid 9g/L, sodium peroxide 13g/L, Sodium tetrafluoroborate 7g/L, citric acid 3g/L, 68%HNO 321ml/L, 70%H 2sO 425ml/L, Stepanol MG 4g/L, fatty alcohol-polyoxyethylene ether 5g/L, surplus is deionized water; Described compound method is:
1) get acid-resistant container, add appropriate amount of deionized water, then add sulfuric acid and nitric acid, after stirring, add zinc nitrate and Calucium Silicate powder successively, stir 12 minutes;
2) get another one container again, add appropriate amount of deionized water, add boric acid and citric acid, after stirring, add Sodium tetrafluoroborate and sodium peroxide successively; Stir 12 minutes;
3) by step 2) solution prepared joins in solution prepared by step 1), adds the deionized water of Stepanol MG, fatty alcohol-polyoxyethylene ether and surplus again, stir 25 minutes after stirring.

Claims (1)

1. a compound method for steel plate electro-galvanizing surface passivation liquid, is characterized in that, consisting of of this passivating solution: zinc nitrate 16-20g/L, Calucium Silicate powder 26-28g/L, boric acid 8-10g/L, sodium peroxide 12-14g/L, Sodium tetrafluoroborate 6-8g/L, citric acid 2-4g/L, 68%HNO 320-22ml/L, 70%H 2sO 424-26ml/L, Stepanol MG 3-5g/L, fatty alcohol-polyoxyethylene ether 4-6g/L, surplus is deionized water; Described compound method is:
1) get acid-resistant container, add appropriate amount of deionized water, then add sulfuric acid and nitric acid, after stirring, add zinc nitrate and Calucium Silicate powder successively, stir 10-14 minute;
2) get another one container again, add appropriate amount of deionized water, add boric acid and citric acid, after stirring, add Sodium tetrafluoroborate and sodium peroxide successively; Stir 10-14 minute;
3) by step 2) solution prepared joins in solution prepared by step 1), adds the deionized water of Stepanol MG, fatty alcohol-polyoxyethylene ether and surplus again, stir 20-30 minute after stirring.
CN201310312750.8A 2013-07-23 2013-07-23 A preparing method of an electrogalvanized surface passivating solution for a steel plate Pending CN104342667A (en)

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CN201310312750.8A CN104342667A (en) 2013-07-23 2013-07-23 A preparing method of an electrogalvanized surface passivating solution for a steel plate

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018024903A (en) * 2016-08-09 2018-02-15 豊田合成株式会社 Antifouling plated article and manufacturing method therefor
CN109628919A (en) * 2019-01-30 2019-04-16 浙江华达新型材料股份有限公司 The preparation of surface of steel plate passivating film and drying process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018024903A (en) * 2016-08-09 2018-02-15 豊田合成株式会社 Antifouling plated article and manufacturing method therefor
CN109628919A (en) * 2019-01-30 2019-04-16 浙江华达新型材料股份有限公司 The preparation of surface of steel plate passivating film and drying process

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Application publication date: 20150211