CN105088212A - Crack-prevention aluminium profile chromate-free passivation treating liquid and preparation method thereof - Google Patents

Abstract

The invention discloses a crack-prevention aluminium profile chromate-free passivation treating liquid, which comprises raw materials of the following parts by weight: 10-10.5 of cerium nitrate, 2-2.2 of potassium permanganate, 0.2-0.3 of dopamine, 0.6-0.8 of ethylenediaminetetraacetic acid disodium salt, 0.5-0.6 of lithium stannate, 0.8-0.9 of ethylenediaminetetraacetic, 0.6-0.8 of styrene, 0.2-0.3 of acrylamide, 0.4-0.5 of acrylic acid, 0.05-0.1 of azodiisobutyronitrile, 0.5-0.6 of sodium allylsulfonate, 0.02-0.03 of lauryl sodium sulfate, 0.9-1 of cetane, 0.3-0.4 of nano-silica, 0.3-0.4 of nano-titanium dioxide and a defined amount of deionized water. The treating liquid can rapidly form a uniform oxidation film; the compactness of the film can be greatly improved by using the dopamine, the lithium stannate, the ethylenediaminetetraacetic acid disodium salt and the ethylenediaminetetraacetic; the number of cracks is obviously reduced; and the corrosion resistance is improved.

Description

A kind of cracking resistance line aluminium section bar non-chromium passivation treatment fluid and preparation method thereof

Technical field

The present invention relates to chromium-free metal surface treatment agent technical field, particularly relate to a kind of cracking resistance line aluminium section bar non-chromium passivation treatment fluid and preparation method thereof.

Background technology

Spray-painted aluminum profile normal chromic salt chemistry deactivation method that adopts before application carries out pre-treatment, but hexavalent chromium has carcinogenesis to human body in chromic salt process, deal with improperly and can cause serious pollution to environment, therefore chromating technique receives great concern, and some country has limited it and used.Recent domestic has carried out large quantity research to non-chromium inactivating technique, develops the multiple passivating solution system for handling such as rare earth, cobalt salt, silicate, molybdic acid, titanium/zirconate, has certain corrosion resistance nature.At present, employing rare-earth cerium compound is that the research of the non-chromium inactivating technique of main component is more, but cerium salt and oxidant species various, adopt cerous nitrate and potassium permanganate composite treating agent to carry out Passivation Treatment to aluminium section bar, obtain good film-formation result and outward appearance, but still to there is passive film even not for the passivation effect of this treatment agent, compactness is inadequate, processing speed is slow, the imperfect shortcoming of corrosion resistance, needs to improve.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of cracking resistance line aluminium section bar non-chromium passivation treatment fluid and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of cracking resistance line aluminium section bar non-chromium passivation treatment fluid, be made up of the raw material of following weight part: cerous nitrate 10-10.5, potassium permanganate 2-2.2, Dopamine HCL 0.2-0.3, EDETATE SODIUM 0.6-0.8, lithium stannate 0.5-0.6, ethylenediamine tetraacetic acid (EDTA) 0.8-0.9, vinylbenzene 0.6-0.8, acrylamide 0.2-0.3, vinylformic acid 0.4-0.5, Diisopropyl azodicarboxylate 0.05-0.1, sodium allylsulfonate 0.5-0.6, sodium lauryl sulphate 0.02-0.03, n-Hexadecane 0.9-1, silane coupling agent KH570 surface modified nano silicon 0.3-0.4, silane coupling agent KH570 surface-modified nano titanium dioxide 0.3-0.4, deionized water is appropriate.

The preparation method of described cracking resistance line aluminium section bar non-chromium passivation treatment fluid, comprises the following steps:

(1) sodium lauryl sulphate is dissolved in the deionized water of 7-7.5 weight part and forms the aqueous solution, n-Hexadecane is mixed with vinylbenzene, silane coupling agent KH570 surface modified nano silicon, silane coupling agent KH570 surface-modified nano titanium dioxide is added after being stirred to dissolving, then by above two kinds of liquid mixing, supersound process 3-4min under ultrasonic cell disruptor, obtains emulsion; Described emulsion and acrylamide, vinylformic acid, sodium allylsulfonate are mixed, stirs, pass into nitrogen 15-16min, regulate pH=8, be warming up to 60-62 DEG C, add Diisopropyl azodicarboxylate, continue stirring reaction 1-2h, obtain membrane-forming agent;

(2) cerous nitrate is mixed with the aqueous solution of 10-10.5g/L, add potassium permanganate by the concentration of 2-2.2g/L again and be mixed with solution, add membrane-forming agent and other remaining components that 0.9-1.1wt% (1) step obtains again, stir, supersound process 3-4min under ultrasonic cell disruptor, to obtain final product.

First aluminium section bar is carried out pre-treatment during use, then be immersed in treatment solution by aluminium section bar and carry out Passivation Treatment, temperature is 15-45 DEG C, and pH value is 1.8-4.5, and process 20-23min, takes out, and rinses with water, dries.

Advantage of the present invention is: treatment solution of the present invention, by using cerous nitrate, potassium permanganate, decreases environmental pollution; Film is made into by using nano silicon, nano titanium oxide and organic materials, make nanoparticle dispersed with system, can promote that passivation uniform composition is coated on aluminium shape surface fast, the uniform oxide film of quick formation, and nano silicon, nano titanium oxide have good antioxidant property, slowing down corrosion speed, improve paint application performance, reduce hole simultaneously, make the film of formation finer and close, even; By using Dopamine HCL, lithium stannate, EDETATE SODIUM, ethylenediamine tetraacetic acid (EDTA), the compactness of film increases substantially, crack number obviously reduces, and erosion resistance improves greatly.

Embodiment

A kind of cracking resistance line aluminium section bar non-chromium passivation treatment fluid, is made up of the raw material of following weight part (kilogram): cerous nitrate 10, potassium permanganate 2, Dopamine HCL 0.2, EDETATE SODIUM 0.6, lithium stannate 0.5, ethylenediamine tetraacetic acid (EDTA) 0.8, vinylbenzene 0.6, acrylamide 0.2, vinylformic acid 0.4, Diisopropyl azodicarboxylate 0.05, sodium allylsulfonate 0.5, sodium lauryl sulphate 0.02, n-Hexadecane 0.9, silane coupling agent KH570 surface modified nano silicon 0.3, silane coupling agent KH570 surface-modified nano titanium dioxide 0.3, deionized water are appropriate.

The preparation method of described cracking resistance line aluminium section bar non-chromium passivation treatment fluid, comprises the following steps:

(1) sodium lauryl sulphate is dissolved in the deionized water of 7 weight parts and forms the aqueous solution, n-Hexadecane is mixed with vinylbenzene, silane coupling agent KH570 surface modified nano silicon, silane coupling agent KH570 surface-modified nano titanium dioxide is added after being stirred to dissolving, then by above two kinds of liquid mixing, supersound process 3min under ultrasonic cell disruptor, obtains emulsion; Described emulsion and acrylamide, vinylformic acid, sodium allylsulfonate are mixed, stirs, pass into nitrogen 15min, regulate pH=8, be warming up to 60 DEG C, add Diisopropyl azodicarboxylate, continue stirring reaction 1h, obtain membrane-forming agent;

(2) cerous nitrate is mixed with the aqueous solution of 10g/L, add potassium permanganate by the concentration of 2g/L again and be mixed with solution, then add the membrane-forming agent and other remaining components that 0.9wt% (1) step obtains, stir, supersound process 3min under ultrasonic cell disruptor, to obtain final product.

First aluminium section bar is carried out pre-treatment during use, then be immersed in treatment solution by aluminium section bar and carry out Passivation Treatment, temperature is 15 DEG C, and pH value is 1.8, and process 20min, takes out, and rinses with water, dries.

Passive film surface is finer and close, and naked eyes this film visible is golden yellow, has good outward appearance; After the test of the acetic acid salt spray of 1000h, corrosion-free, without obscission.

Claims (2)

1. a cracking resistance line aluminium section bar non-chromium passivation treatment fluid, it is characterized in that being made up of the raw material of following weight part: cerous nitrate 10-10.5, potassium permanganate 2-2.2, Dopamine HCL 0.2-0.3, EDETATE SODIUM 0.6-0.8, lithium stannate 0.5-0.6, ethylenediamine tetraacetic acid (EDTA) 0.8-0.9, vinylbenzene 0.6-0.8, acrylamide 0.2-0.3, vinylformic acid 0.4-0.5, Diisopropyl azodicarboxylate 0.05-0.1, sodium allylsulfonate 0.5-0.6, sodium lauryl sulphate 0.02-0.03, n-Hexadecane 0.9-1, silane coupling agent KH570 surface modified nano silicon 0.3-0.4, silane coupling agent KH570 surface-modified nano titanium dioxide 0.3-0.4, deionized water is appropriate.

2. the preparation method of cracking resistance line aluminium section bar non-chromium passivation treatment fluid according to claim 1, is characterized in that comprising the following steps:

(1) sodium lauryl sulphate is dissolved in the deionized water of 7-7.5 weight part and forms the aqueous solution, n-Hexadecane is mixed with vinylbenzene, silane coupling agent KH570 surface modified nano silicon, silane coupling agent KH570 surface-modified nano titanium dioxide is added after being stirred to dissolving, then by above two kinds of liquid mixing, supersound process 3-4min under ultrasonic cell disruptor, obtains emulsion; Described emulsion and acrylamide, vinylformic acid, sodium allylsulfonate are mixed, stirs, pass into nitrogen 15-16min, regulate pH=8, be warming up to 60-62 DEG C, add Diisopropyl azodicarboxylate, continue stirring reaction 1-2h, obtain membrane-forming agent;

(2) cerous nitrate is mixed with the aqueous solution of 10-10.5g/L, add potassium permanganate by the concentration of 2-2.2g/L again and be mixed with solution, add membrane-forming agent and other remaining components that 0.9-1.1wt% (1) step obtains again, stir, supersound process 3-4min under ultrasonic cell disruptor, to obtain final product.