CN101054665A - Electrolytic zinc plating and zinc-iron alloy silicate cleaning deactivation liquid - Google Patents

Electrolytic zinc plating and zinc-iron alloy silicate cleaning deactivation liquid Download PDF

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Publication number
CN101054665A
CN101054665A CN 200710065896 CN200710065896A CN101054665A CN 101054665 A CN101054665 A CN 101054665A CN 200710065896 CN200710065896 CN 200710065896 CN 200710065896 A CN200710065896 A CN 200710065896A CN 101054665 A CN101054665 A CN 101054665A
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China
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zinc
silicate
iron alloy
electro
galvanizing
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CN 200710065896
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张英杰
范云鹰
闫磊
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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Priority to CN 200710065896 priority Critical patent/CN101054665A/en
Publication of CN101054665A publication Critical patent/CN101054665A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a clean passivation liquid for electro-zinc and zinc/iron alloy silicate, which is mainly used for the after-treatment procedures of electro-zinc and zinc/iron alloy on the surface of steel and ion parts. The invention belongs to the surface treatment technical field of metal materials. The passivation liquid is composed of silicate, H2O2, HNO3, H2SO4 and H2O, which is characterized in no toxicant, stability, credibility, low cost and no Cr. The zinc and zinc/iron alloy cladding treated with the passivation liquid have the advantages of apparently improved corrosion resistance, cleanness, environmental protection, economy, practicality and good use effect etc.

Description

A kind of electro-galvanizing and zinc-iron alloy clean purification liquid of silicate
Technical field
The present invention relates to a kind of electro-galvanizing and zinc-iron alloy clean purification liquid of silicate, be mainly used in the postprocessing working procedures of the zinc-plated and zinc-iron alloy of steel-iron components surface electrical, belong to the metal material surface processing technology field.
Technical background
Corrosion and corrosion protection is related to Economic development and people's life safety, and surface engineering technology is to solve component of machine and material corrosion and most economical effective means of protection and method.
Zinc-plated and zinc-iron alloy is the effective way that improves the steel-iron components resistance to corrosion, is widely used at present in many fields such as shipbuilding industry, mechanical industry, aviation, building.But in a humid environment, especially in hygrothermal environment, zinc-plated and zinc-iron alloy layer easily corrodes, and makes coating surface form corrosion product---the white rust of lead or white loose; Time has been grown and red rust can occur, thereby loses preservative effect.In order to improve the solidity to corrosion of coating, must carry out Passivation Treatment to coating and form surface passivated membrane.
Nearly all steel plate galvanized aftertreatment technology has all adopted the chromating processing at present, but owing to sexavalent chrome toxicity in the chromic salt is high and easily carcinogenic, government's strictness limits using and discharging of chromic salt; And emphasize in the Eleventh Five-Year Plan that a development environment resist technology gives priority to.Therefore the chromating technology is faced with severe challenge, and seeks and adopt the chromium-free deactivation technology of compliance with environmental protection requirements just becoming the inexorable trend of present development.Chromium-free deactivation on the at present both at home and abroad zinc-plated and alloy layer mainly contains molybdate passivation, rare earth metal passivation, silicate passivation, phytic acid passivation and organism passivation etc., but the solidity to corrosion that the passivation effect of these chromium-free deactivation technology does not also reach chromating to be had, or expense is too high, to such an extent as to also there is not a kind of non-chromium inactivating technique to replace chromating technology fully at present, clean accordingly, passivating solution technology low-cost, good passivation effect do not have yet.
Summary of the invention
The objective of the invention is to overcome the deficiency that has passivating technique in zinc-plated and the zinc-iron alloy now, provide a kind of do not contain Toxic matter, electro-galvanizing that the product performance of handling are good, production cost is low and zinc-iron alloy clean purification liquid of silicate, be used for the component of electro-galvanizing and zinc-iron alloy are carried out aftertreatment, to improve the solidity to corrosion of component.
Technical scheme of the present invention is: this electro-galvanizing and zinc-iron alloy clean purification liquid of silicate, and by silicate, H 2O 2, HNO 3, H 2SO 4And H 2O forms, and the content of each constituent is silicate 5~20g/L, boric acid 2~6g/L, H 2O 25~20ml/L, HNO 33~15ml/L, H 2SO 43~15ml/L, all the other are H 2O, silicate can be any in water glass or the potassium silicate.The pH value of passivating solution is 1.5~3, can pass through ordinary method, uses rare H 2SO 4Or dilute NaOH solution adjustment.
Each constituent content of the present invention and and the silicate kind can in given range, select according to actual needs.
This passivating solution can adopt following steps and method preparation: take by weighing 5~20g/L analytical pure silicate according to the volume total amount earlier, pour in the beaker that fills 10~30 times of quality tap water, be stirred well to silicate with glass stick and dissolve fully, obtain aqueous silicate solution; Take by weighing 2~6g/L analytical pure boric acid according to the volume total amount again, pour in the beaker that fills 10~30 times of quality tap water, be stirred well to boric acid with glass stick and dissolve fully, obtain boric acid aqueous solution; Respectively measure analytical pure dense HNO by 3~15ml/L with transfer pipet according to the volume total amount then 3With dense H 2SO 4, successively slowly add and dissolve completely in the silicate solutions, stir with glass stick while adding, until mixing, again the boric acid aqueous solution that has prepared is joined this silicate for preparing and dense HNO 3With dense H 2SO 4Mixing solutions in, stir with glass stick while adding, until mixing; Afterwards, measure analytical pure H by 5~20ml/L with transfer pipet according to the volume total amount again 2O 2, join the silicate that has prepared, dense HNO 3, dense H 2SO 4In the mixing solutions of boric acid, the limit edged stirs with glass stick, until mixing; Be instrument with the digital ph then, use rare H 2SO 4Or rare NaOH prepared by silicate, boric acid, H 2O 2, HNO 3, H 2SO 4With H 2The pH value of the mixing solutions that O forms transfers to 1.5~3, and arrives volume requiredly with the tap water constant volume, obtains containing silicate 5~20g/L, boric acid 2~6g/L, H 2O 25~20ml/L, HNO 33~15ml/L, H 2SO 43~15ml/L, all the other are H 2The clean silicate passivating solution of O.The whole technological process of the present invention is at room temperature carried out, and each constituent content and operational condition can be selected in given range according to actual needs in light-emitting solution and the passivating solution.
Use this electro-galvanizing and zinc-iron alloy with the technical process of clean purification liquid to be: water component zinc-plated or zinc-iron alloy cleans up, and puts into by HNO then 3And H 2In the light-emitting solution that O forms, stopped under the room temperature 3~10 seconds, put into this electro-galvanizing and zinc-iron alloy clean purification liquid again, keeping pH is 1.5~3, kept under the room temperature 30~90 seconds, again component are taken out from passivating solution and clean up, with blower the moisture of component surface is dried up at last and get final product with tap water.Each constituent and content thereof are in the light-emitting solution: HNO 32~5ml/L, all the other are H 2O.
The present invention is owing to adopt the main component of silicate as passivating solution, and is equipped with boric acid, H 2O 2, HNO 3And H 2SO 4The aftertreatment technology that is used for electro-galvanizing and zinc-iron alloy technology can significantly improve the solidity to corrosion of electro-galvanizing and zinc-iron alloy, makes salt-fog test go out the white rust time and can reach more than 40~100 hours, reached the performance level of chromating, and far above national standard (30 hours).Owing in passivating solution, do not contain chromium, overcome chromating technology toxicity greatly, shortcoming such as not environmental protection, can realize the cleaner production of electro-galvanizing and zinc-iron alloy; Simultaneously, Lian Jia silicate makes the passivation cost reduce greatly again.Use the passivation technology of this passivating solution reliable and stable, the product performance of being produced are good, production cost is low, have very great social significance and using value.
Embodiment:
Below in conjunction with embodiment essence of the present invention is described further.
Embodiment 1: this electro-galvanizing and zinc alloy consist of water glass 5g/L, boric acid 2g/L, H with clean purification liquid 2O 25ml/L, HNO 33ml/L, H 2SO 43ml/L, all the other are H 2O, the pH value is 3.
This passivating solution is used for the galvanized steel plate in part is carried out the silicate Passivation Treatment.After the pre-treatments such as this steel plate eliminated rust before electroplating, oil removing, activation, put into electroplate liquid to electroplate, the plating bath of zincincation is formed and operational condition is: ZnCl 280g/L, KCl200g/L, additive pH value an amount of, plating bath remain on about 5.5, and current density is 1.2A/dm 2, temperature is a room temperature, electroplating time is 25 minutes.
After the plating part is taken out cleaning, put into by HNO then 32ml/L and H 2In the light-emitting solution that O forms, stopped 10 seconds under the room temperature, take out back part water and clean up, used under this passivating solution room temperature Passivation Treatment again 90 seconds, at last component are cleaned up and dry up piece surface moisture with blower.
Zinc coating outward appearance after using this passivating solution to handle is light evenly, goes out the white rust time above 100 hours through neutral salt spray test.
Embodiment 2: this electro-galvanizing and zinc alloy consist of potassium silicate 10g/L, boric acid 4g/L, H with clean purification liquid 2O 210ml/L, HNO 310ml/L, H 2SO 410ml/L, all the other are H 2O, the pH value is 2.2.
This passivating solution is used for the silicate Passivation Treatment behind certain steel pipe integral plating zn-fe alloy on the air compressor machine.Steel pipe is implemented to electroplate after pre-treatment (rust cleaning, oil removing, activation), and the plating bath of zinc-iron alloy plating process is formed and operational condition is: ZnCl 2100g/L, KCl230g/L, FeSO 47H 2O 10g/L, xitix 1.2g/L, additive are an amount of, pH value 4.0, cathode current density 1.8A/dm 2, temperature is room temperature, electroplating time is 40 minutes, iron level is 0.5% in the gained Zn-Fe alloy coating.
After the plating steel pipe taking-up and water are cleaned up, put into by HNO then 33ml/L and H 2In the light-emitting solution that O forms, stopped 6 seconds under the room temperature, take out back part water and clean up, used under this passivating solution room temperature Passivation Treatment again 60 seconds, at last component are cleaned up and dry up piece surface moisture with blower.
Zn-Fe alloy coating after using this passivating solution to handle, outward appearance is light evenly, go out the white rust time above 40 hours through neutral salt spray test, substantially exceeded the corrosion resisting property (25 hours) of existing chromating technology, also surpassed national standard (30 hours).
Embodiment 3: this electro-galvanizing and zinc alloy consist of water glass 20g/L, boric acid 6g/L, H with clean purification liquid 2O 220ml/L, HNO 315ml/L, H 2SO 415ml/L, all the other are H 2O, the pH value is 1.5.
This passivating solution is used for certain Machine Steel casing is carried out whole Passivation Treatment after zinc-plated.The steel casing is implemented to electroplate after pre-treatment (rust cleaning, oil removing, activation), and the plating bath of zincincation is formed and operational condition is: ZnCl 290g/L, KCl 220g/L, additive are an amount of, pH value 5.0, cathode current density 1.5A/dm 2, temperature is room temperature, electroplating time is 30 minutes.
After the plating taking-up of steel casing and water are cleaned up, put into by HNO then 35ml/L and H 2In the light-emitting solution that O forms, stopped 3 seconds under the room temperature, take out back part water and clean up, used under this passivating solution room temperature Passivation Treatment again 30 seconds, at last the steel casing is cleaned up and dry up piece surface moisture with blower.
Galvanized steel casing outward appearance after using this passivating solution to handle is light evenly, goes out the white rust time above 60 hours through neutral salt spray test.

Claims (3)

1, a kind of electro-galvanizing and zinc-iron alloy clean purification liquid of silicate, be used for the Passivation Treatment behind iron and steel parts electro-galvanizing or the zinc-iron alloy, form fine and close passive film on the surface of zinc or Zn-Fe alloy electroplating layer, improve the solidity to corrosion of the component be coated with zinc or zinc-iron alloy, it is characterized in that each constituent and content are in this silicate passivating solution: silicate 5~20g/L, boric acid 2~6g/L, H 2O 25~20ml/L, HNO 33~15ml/L, H 2SO 43~15ml/L, all the other are H 2O.
2, electro-galvanizing according to claim 1 and zinc-iron alloy clean purification liquid of silicate, the pH value that it is characterized in that passivating solution is 1.5~3.
3, electro-galvanizing according to claim 1 and 2 and zinc-iron alloy clean purification liquid of silicate is characterized in that silicate can be any in water glass or the potassium silicate.
CN 200710065896 2007-05-22 2007-05-22 Electrolytic zinc plating and zinc-iron alloy silicate cleaning deactivation liquid Pending CN101054665A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101580935B (en) * 2009-06-24 2010-09-15 昆明理工大学 Clean galvanized part silicate colorful passivating process
CN101857955A (en) * 2010-06-01 2010-10-13 昆明理工大学 Silicate antirust liquid
CN101857954A (en) * 2010-06-01 2010-10-13 昆明理工大学 Silicate steel rust prevention method
CN101660156B (en) * 2009-09-10 2011-12-07 昆明理工大学 Silicate color passivation solution used for zinc-plating material
CN101654783B (en) * 2009-09-10 2011-12-28 昆明理工大学 Method for preparing silicate colorized passivating liquid for galvanization member
CN107151809A (en) * 2017-05-26 2017-09-12 东强(连州)铜箔有限公司 A kind of environment-friendly type electrolytic copper foil non-chromium passivation treatment fluid and processing method
CN108103487A (en) * 2017-12-18 2018-06-01 陕西省石油化工研究设计院 A kind of zinc-plated silicate passivation solution and preparation method thereof
CN110846694A (en) * 2019-12-31 2020-02-28 天长市飞龙金属制品有限公司 Zinc plating solution

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101580935B (en) * 2009-06-24 2010-09-15 昆明理工大学 Clean galvanized part silicate colorful passivating process
CN101660156B (en) * 2009-09-10 2011-12-07 昆明理工大学 Silicate color passivation solution used for zinc-plating material
CN101654783B (en) * 2009-09-10 2011-12-28 昆明理工大学 Method for preparing silicate colorized passivating liquid for galvanization member
CN101857955A (en) * 2010-06-01 2010-10-13 昆明理工大学 Silicate antirust liquid
CN101857954A (en) * 2010-06-01 2010-10-13 昆明理工大学 Silicate steel rust prevention method
CN101857955B (en) * 2010-06-01 2011-10-19 昆明理工大学 Silicate antirust liquid
CN101857954B (en) * 2010-06-01 2012-03-21 昆明理工大学 Silicate steel rust prevention method
CN107151809A (en) * 2017-05-26 2017-09-12 东强(连州)铜箔有限公司 A kind of environment-friendly type electrolytic copper foil non-chromium passivation treatment fluid and processing method
CN107151809B (en) * 2017-05-26 2019-03-08 东强(连州)铜箔有限公司 A kind of environment-friendly type electrolytic copper foil non-chromium passivation treatment fluid and processing method
CN108103487A (en) * 2017-12-18 2018-06-01 陕西省石油化工研究设计院 A kind of zinc-plated silicate passivation solution and preparation method thereof
CN110846694A (en) * 2019-12-31 2020-02-28 天长市飞龙金属制品有限公司 Zinc plating solution

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Open date: 20071017