CN105316665A - Abrasion-resistant and scraping-resistant aluminum alloy chromium-free passivating agent and preparation method thereof - Google Patents

Abstract

The invention discloses an abrasion-resistant and scraping-resistant aluminum alloy chromium-free passivating agent and a preparation method thereof. The passivating agent is prepared from, by weight, 5-10 parts of 30-40% hexafluorotitanic acid, 5-10 parts of 40-45% hexafluorozirconic acid, 1-2 parts of polyepoxysuccinic acid, 4-6 parts of sodium gluconate, 1-2 parts of sodium fluoride, 1-2 parts of 65-70% nitric acid, 1-2 parts of Turkey red oil, 1-2 parts of simethicone, 50-100 parts of 40-50% polyethylene wax emulsion, 50-100 parts of coalescing agents and 800-1000 parts of water. According to the aluminum alloy passivating agent, a compact film of a net structure can be formed on the surface of aluminum alloy, excellent strength, tenacity and adhesive capacity are achieved, and the corrosion resistance is good; meanwhile, good abrasion resistance is achieved, abrasion and scraping on the surface of the aluminum alloy can be reduced, environment pollution can be reduced, and good economic benefits and social benefits are achieved.

Description

A kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator and preparation method thereof

Technical field

The present invention relates to aluminium alloy passivating technique field, particularly relate to a kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator and preparation method thereof.

Background technology

Aluminium alloy has many excellent performances, is widely used in multiple fields such as communications and transportation, packaging vessel, aerospace, household electrical appliance, machinofacture, architectural shape, telecommunications.But the poor-performings such as the erosion resistance of aluminium alloy, wear resistance, hardness, be in use easily corroded, therefore aluminium section bar has to pass through effective surface treatment before application, to avoid or to reduce corrosion.

Chromating process is as the most frequently used aluminum alloy surface treatment technology, have easy to use, cheap, corrosion resistance nature and the good advantage of decorate properties, but the sexavalent chrome toxicity in treatment soln is large, environmental pollution serious, is limited by multinational appearance policies and regulations or prohibit the use.Therefore, chromium-free deactivation system is sought very necessary.Wherein titanium zirconium base passivating technique has that technique is simple, good stability, low cost and other advantages, but its erosion resistance and sticking power are not as chromating process, limit its application.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art; there is provided a kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator, have excellent adhesive ability and corrosion resistance nature, wear resisting property is excellent; the wearing and tearing of aluminum alloy surface, scraping can be reduced, significant provide protection is played to aluminium alloy.

The present invention is achieved by the following technical solutions:

A kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator, it is obtained by the raw material of following weight parts:

30-40% hydrofluotitanic acid 5-10,40-45% fluorine zirconic acid 5-10, poly-epoxy succinic acid 1-2, Sunmorl N 60S 4-6, Sodium Fluoride 1-2,65-70% nitric acid 1-2, alizarin assistant 1-2, dimethyl silicone oil 1-2,40-50% polythene wax emulsion 50-100, film coalescence aid 50-100, water 800-1000;

Wherein film coalescence aid is made up of the raw material of following weight part: polyvinyl alcohol 1-2, bisphenol A type epoxy resin 10-15, glyceryl monostearate 0.5-1, vinylformic acid 4-6, carbon nanotube 1-2, butyl glycol ether 10-15, diethanolamine 5-10, dibenzoyl peroxide 0.2-0.4, water 60-80; Polyvinyl alcohol, bisphenol A type epoxy resin and glyceryl monostearate are added 85-90 DEG C of stirring 4-6h in reaction vessel by the preparation method of film coalescence aid, first add butyl glycol ether 120-140 DEG C to stir until melting, add dibenzoyl peroxide, vinylformic acid and carbon nanotube 70-80 DEG C of reaction 2-4h again, finally add all the other raw materials and stir 40-50 DEG C of reaction 0.5-1h, pH is adjusted to 6-7, obtains final product.

A preparation method for wear-resisting scrape resistant aluminium alloy non-chromium passivator, comprises the following steps:

(1) raw material is taken by weight, first hydrofluotitanic acid, fluorine zirconic acid, poly-epoxy succinic acid, Sodium Fluoride and nitric acid are added to the water and stir, then add alizarin assistant 600-1000r/min and stir 10-15min, finally add dimethyl silicone oil 60-80 DEG C and stir 0.5-1h, after cooling, pH is adjusted to 4-4.5, obtains mixed solution;

(2) after being mixed with all the other raw materials by the mixed solution in (1), 50-60 DEG C is stirred 0.5-1h, and cooled and filtered removing impurity, obtains wear-resisting scrape resistant aluminium alloy non-chromium passivator.

Advantage of the present invention is:

The present invention introduces polyvinyl alcohol, vinylformic acid and carbon nano-tube modification agent in the epoxy and obtains film coalescence aid, bonding titanium zirconium base passivator, and with all the other raw materials carry out composite after obtain composite type aluminum alloy passivator, the film with cancellated densification can be formed in aluminum alloy surface, compared with the film formed with conventional titanium zirconium base passivator, there is excellent intensity, toughness and adhesive ability, corrosion resistance nature is good, there is good wear resisting property simultaneously, the wearing and tearing of aluminum alloy surface, scraping can be reduced, there is good economic benefit and social benefit.

Embodiment

A kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator, it is obtained by the raw material of following weight parts:

40% hydrofluotitanic acid 5,40% fluorine zirconic acid 5, poly-epoxy succinic acid 1, Sunmorl N 60S 4, Sodium Fluoride 1,65% nitric acid 1, alizarin assistant 1, dimethyl silicone oil Isosorbide-5-Nitrae 0% polythene wax emulsion 50, film coalescence aid 50, water 800;

Wherein film coalescence aid is made up of the raw material of following weight part: polyvinyl alcohol 1, bisphenol A type epoxy resin 10, glyceryl monostearate 0.5, vinylformic acid 4, carbon nanotube 1, butyl glycol ether 10, diethanolamine 5, dibenzoyl peroxide 0.2, water 60; Polyvinyl alcohol, bisphenol A type epoxy resin and glyceryl monostearate are added 85 DEG C of stirring 4h in reaction vessel by the preparation method of film coalescence aid, first add butyl glycol ether 120 DEG C to stir until melting, add dibenzoyl peroxide, vinylformic acid and carbon nanotube 70 DEG C reaction 2h again, finally add all the other raw materials and stir 40 DEG C of reaction 0.5h, pH is adjusted to 7, obtains final product.

A preparation method for wear-resisting scrape resistant aluminium alloy non-chromium passivator, comprises the following steps:

(1) raw material is taken by weight, first hydrofluotitanic acid, fluorine zirconic acid, poly-epoxy succinic acid, Sodium Fluoride and nitric acid are added to the water and stir, then add alizarin assistant 600r/min and stir 10min, finally add dimethyl silicone oil 60 DEG C and stir 0.5h, after cooling, pH is adjusted to 4, obtains mixed solution;

(2) mixed solution in (1) is mixed latter 50 DEG C with all the other raw materials and stir 0.5h, cooled and filtered removing impurity, obtains wear-resisting scrape resistant aluminium alloy non-chromium passivator.

Carry out Passivation Treatment with above-mentioned obtained chrome-free tanning agent to aluminium alloy, passivating conditions is 50 DEG C, 3min, then dries 15min in 90 DEG C, and it is as follows to carry out the performance test results:

Performance project	Chromium-free passivating film
		Sticking power	0 grade
Shock test	Zero defect
		Humid test (1000h)	Zero defect
Neutral salt spray test (168h)	Zero defect
		Outdoor exposure 1 year	Zero defect

Claims (2)

1. a wear-resisting scrape resistant aluminium alloy non-chromium passivator, is characterized in that, it is obtained by the raw material of following weight parts:

30-40% hydrofluotitanic acid 5-10,40-45% fluorine zirconic acid 5-10, poly-epoxy succinic acid 1-2, Sunmorl N 60S 4-6, Sodium Fluoride 1-2,65-70% nitric acid 1-2, alizarin assistant 1-2, dimethyl silicone oil 1-2,40-50% polythene wax emulsion 50-100, film coalescence aid 50-100, water 800-1000;

Described film coalescence aid is made up of the raw material of following weight part: polyvinyl alcohol 1-2, bisphenol A type epoxy resin 10-15, glyceryl monostearate 0.5-1, vinylformic acid 4-6, carbon nanotube 1-2, butyl glycol ether 10-15, diethanolamine 5-10, dibenzoyl peroxide 0.2-0.4, water 60-80; Polyvinyl alcohol, bisphenol A type epoxy resin and glyceryl monostearate are added 85-90 DEG C of stirring 4-6h in reaction vessel by the preparation method of film coalescence aid, first add butyl glycol ether 120-140 DEG C to stir until melting, add dibenzoyl peroxide, vinylformic acid and carbon nanotube 70-80 DEG C of reaction 2-4h again, finally add all the other raw materials and stir 40-50 DEG C of reaction 0.5-1h, pH is adjusted to 6-7, obtains final product.

2. the preparation method of a kind of wear-resisting scrape resistant aluminium alloy non-chromium passivator according to claim 1, is characterized in that, comprise the following steps:

(1) raw material is taken by weight, first hydrofluotitanic acid, fluorine zirconic acid, poly-epoxy succinic acid, Sodium Fluoride and nitric acid are added to the water and stir, then add alizarin assistant 600-1000r/min and stir 10-15min, finally add dimethyl silicone oil 60-80 DEG C and stir 0.5-1h, after cooling, pH is adjusted to 4-4.5, obtains mixed solution;

(2) after being mixed with all the other raw materials by the mixed solution in (1), 50-60 DEG C is stirred 0.5-1h, and cooled and filtered removing impurity, obtains wear-resisting scrape resistant aluminium alloy non-chromium passivator.