CN101886260A - Composite film chromium-free passivant - Google Patents
Composite film chromium-free passivant Download PDFInfo
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- CN101886260A CN101886260A CN2010102325419A CN201010232541A CN101886260A CN 101886260 A CN101886260 A CN 101886260A CN 2010102325419 A CN2010102325419 A CN 2010102325419A CN 201010232541 A CN201010232541 A CN 201010232541A CN 101886260 A CN101886260 A CN 101886260A
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Abstract
The invention relates to a composite film chromium-free passivant, which mainly comprises the following components of: a waterborne resin film-forming substance, an organic acid film-forming substance, an inorganic film-forming substance, a film-forming auxiliary agent, an additive, water and the like. The formula of the composite film chromium-free passivant is scientific and reasonable, does not comprise toxic and harmful substances such as chromium and the like, and meets the requirements of ROHS environmental protection laws and regulations which have been implemented by European Union since July 2006, so that the composite film chromium-free passivant is an environmentally-friendly chemical treatment agent. The composite film chromium-free passivant is suitable for hot galvanizing and electrogalvanizing post-processing technology, and the passivation process is simple and easy to operate. An organic and inorganic composite film is formed on the surface of a galvanized part after passivation by using the composite film chromium-free passivant. The composite film is colorless and transparent, has high corrosion resistance and can substitute for the traditional chromate to perform the passivation.
Description
Technical field
The present invention relates to a kind of treatment agent that is used for pot galvanize, electro-galvanizing Passivation Treatment.Be a kind of novel environment friendly passivator that can substitute the passivation of traditional chromic acid salt.
Background technology
Zinc-plated is to improve the weather-resistant effective ways of iron and steel, but in wet environment, zinc coating corrodes easily, and the surface forms the corrosives of white loose or becomes gloomy color, has a strong impact on the performance of galvanized workpiece.Therefore thereby zinc coating will carry out Passivation Treatment at zinc laminar surface covering layer protecting film.Traditional Passivation Treatment process adopts chromating more.Chromating is divided into sexavalent chrome passivation and trivalent chromium passivation, and wherein the sexavalent chrome passivation is because price is low, and performance is good, and is most widely used general.But sexavalent chrome is a highly toxic substance, and can be carcinogenic.From the angle of protection environment and human health, countries in the world all begin restriction even ban use of sexavalent chrome to carry out passivation at present, come into effect the ROHS environmental protection act of non-hexavalent chromium from July, 2006 as European Union.The another kind of passivation technology of chromating is the trivalent chromium passivation, chromic toxicity approximately is chromic 1/100, but having very strong toxicity, the passive film corrosion resistance that uses the trivalent chromium passivation is than sexavalent chrome difference, and the trivalent chromium passive film does not have self-healing properties.Therefore, it is very urgent to develop the demand of a kind of nontoxic, environmental protection, efficient chrome-free tanning agent.
Though occurred multiple chrome-free tanning agent product in recent years on the market, with present passivation industry the requirement of chrome-free tanning agent to be compared and also had certain gap, existing chrome-free tanning agent can not satisfy the needs in market.The patent No. is CN1556246, and denomination of invention discloses a kind of chrome-free tanning agent for " chromium-free passivation liquid ".Disclosed chrome-free tanning agent be complex compound with titanium ion, mn ion, molybdenum ion and citric acid, tartrate etc. as main anti-corrosion material, the passive film that obtains is the chromatic passivation film, and what generally need is water white passive film.In the performance evaluation of passivator, corrosion resistance is most important index.White rust only just appearred in 24 hours in two component chrome-free tanning agent salt-fog resistant tests that Tianjin factory produces.
Summary of the invention
The objective of the invention is to according to of the requirement of present zinc-plated industry, provide a kind of use at normal temperatures, passivating solution to stablize, do not contain hazardous and noxious substances such as chromium, a kind of environment-friendly type composite film chromium-free passivant that organic membrane combines with mineral membrane chrome-free tanning agent.
Technical scheme of the present invention: a kind of composite film chromium-free passivant, the composition of passivator and content are:
Water 100g
Water-base resin class filmogen 5～15g
Organic acid filmogen 3～5g
Mineral-type filmogen 5～15g
Film coalescence aid 1～3g
Additive 1～3g
Above-mentioned described a kind of composite film chromium-free passivant is a kind of environment-friendly type treatment agent that does not contain hazardous and noxious substances such as chromium.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that, described water-base resin class filmogen is one or more the combination that comprises in aqueous epoxy resins, water-borne acrylic resin, aqueous alkide resin, the aqueous polyurethane.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that, described organic acid filmogen is one or more the combination that comprises in Weibull, phytic acid, the citric acid.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that, described mineral-type filmogen is one or more the combination that comprises in Sodium orthomolybdate, water glass, nano silicon, the water silica sol.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that, described film coalescence aid is one or more the combination that comprises in nitric acid, sulfuric acid, phosphoric acid, the hydrogen peroxide.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that, described additive is one or more the combination in ethylene glycol ether, propylene glycol monomethyl ether, propylene glycol butyl ether, the water-soluble titanium acid esters.
Above-mentioned described a kind of composite film chromium-free passivant is characterized in that this passivator can form organic and inorganic substances compound membrane at the zinc laminar surface, reaches the duplicate protection to the zinc layer.
Superiority of the present invention is:
1, do not contain hazardous and noxious substances such as sexavalent chrome, trivalent chromium, meet the ROHS environmental protection act that European Union carries out-ban use of sexavalent chrome.
2, passivation technology of the present invention is simple to operation, forms organic and inorganic substances compound membrane at the zinc laminar surface, and the composite membrane of formation has good physicals and corrosion resistance.
Embodiment
Embodiment 1: preparation 100kg passivator
Under the certain temperature with the 20kg water-borne acrylic resin, the 20kg water silica sol, the 1kg phytic acid, the 1kg Sodium orthomolybdate, 5kg water-soluble titanium acid esters, surplus is a water, joins and stirs 30min in the container.
Embodiment 2: preparation 100kg passivator
Under the certain temperature with the 10kg water-borne acrylic resin, the 10kg aqueous polyurethane, the 10kg water silica sol, the 1kg phytic acid, the 5kg water glass, 5kg propylene glycol butyl ether, surplus is a water, joins and stirs 30min in the container.
Embodiment 3: preparation 100kg passivator
Under the certain temperature with the 10kg aqueous polyurethane, the 10kg aqueous epoxy resins, the 3kg nano silicon, the 1kg Weibull, the 1kg Sodium orthomolybdate, the 5kg glycol divinyl ether, surplus is a water, joins and stirs 30min in the container.
Embodiment 4: preparation 100kg passivator
Under the certain temperature with the 20kg water-borne acrylic resin, the 10kg water silica sol, the 1kg phytic acid, the 1kg Sodium orthomolybdate, the 5kg hydrogen peroxide, the 2kg ethylene thiourea, the 5kg propylene glycol monomethyl ether, surplus is a water, joins and stirs 30min in the container.
Select the passivator of any one prescription among the embodiment 1～4 for use, the passivation galvanized workpiece.
The passivation technology process is the cleaning oil removing → bright dipping → cleaning → passivation → drying of sample.6 ‰ salpeter solution is used in bright dipping, and the bright dipping time is 10s.Passivation temperature is 25 ℃, and passivation time is 35s.70 ℃ of freeze-day with constant temperature 20min carried out salt-fog test in aging 48 hours under the room temperature of dry back, measured corrosion resistance.
Claims (8)
1. composite film chromium-free passivant, it is characterized in that: the composition of passivator and content are:
Water 100g
Water-base resin class filmogen 5～15g
Organic acid filmogen 3～5g
Mineral-type filmogen 5～15g
Film coalescence aid 1～3g
Additive 1～3g
2. a kind of composite film chromium-free passivant according to claim 1 is characterized in that this passivator does not contain hazardous and noxious substances such as chromium, is a kind of environmental-protecting chemical treatment agent.
3. a kind of composite film chromium-free passivant according to claim 1, it is characterized in that described water-base resin class filmogen is one or more the combination that comprises in aqueous epoxy resins, water-borne acrylic resin, aqueous alkide resin, the aqueous polyurethane.
4. a kind of composite film chromium-free passivant according to claim 1 is characterized in that, described organic acid filmogen is one or more the combination that comprises in Weibull, phytic acid, the citric acid.
5. a kind of composite film chromium-free passivant according to claim 1 is characterized in that, described mineral-type filmogen is one or more the combination that comprises in Sodium orthomolybdate, water glass, nano silicon, the water silica sol.
6. a kind of composite film chromium-free passivant according to claim 1 is characterized in that, described film coalescence aid is one or more the combination that comprises in nitric acid, sulfuric acid, phosphoric acid, the hydrogen peroxide.
7. a kind of composite film chromium-free passivant according to claim 1 is characterized in that, described additive is one or more the combination in ethylene glycol ether, propylene glycol monomethyl ether, propylene glycol butyl ether, the water-soluble titanium acid esters.
8. a kind of composite film chromium-free passivant according to claim 1 is characterized in that this passivator forms organic and inorganic substances compound membrane at the zinc laminar surface, reaches the duplicate protection to the zinc layer.
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| CN2010102325419A CN101886260A (en) | 2010-07-08 | 2010-07-08 | Composite film chromium-free passivant |
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| CN2010102325419A CN101886260A (en) | 2010-07-08 | 2010-07-08 | Composite film chromium-free passivant |
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| CN102534593A (en) * | 2012-02-24 | 2012-07-04 | 安徽未来表面技术有限公司 | Resin/silane compounded passivation liquid for galvanized coil steel and preparation method of resin/silane compounded passivation liquid |
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