CN104099593A - Surface treating agent for trace rare earth aluminum alloy - Google Patents

Abstract

The invention discloses a surface treating agent for trace rare earth aluminum alloy. The surface treating agent comprises the following raw materials in parts by weight: 1-2 parts of phosphorous acid, 0.01-0.04 part of lanthanum citrate, 0.02-0.03 part of cerium citrate, 1-2 parts of hydrolytic polymaleic anhydride, 2-3.1 parts of pentaerythritol, 2-3 parts of amino trimethylene phosphonic acid, 0.1-0.4 part of melamine, 0.2-0.3 part of aluminum nitride powder, 0.6-1 part of ethylene bis-stearamide, 2-3.5 parts of ethylene glycol, 0.2-0.3 part of tributyl tin chloride, 2-3 parts of a coalescing agent, 10-13 parts of 3-amino propyl trimethoxy silane, 5-8 parts of bis(gamma-triethoxysilyl propyl) tetrasulfide, and 110-140 parts of de-ionized water. The lanthanum citrate and the cerium citrate added in the surface treating agent have good water solubility, so that the compatibility among all the materials is improved, the surface resistance and the weather resistance of a coating film are improved, and the coating film is uniform, smooth and stable.

Description

A kind of trace rare-earth aluminum alloy surface treatment agent

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Technical field

The present invention relates generally to field of surface treatment, relates in particular to a kind of trace rare-earth aluminum alloy surface treatment agent.

Background technology

The surface treatment method of aluminium alloy has a lot, as Physical, chemical method, physico-chemical processes and synthetic method.Conventional method is anonizing now, form conversion film by electrochemical method in aluminum alloy surface, although this method can improve the trace rare-earth performance of aluminium alloy, but the ability that it conforms, transform rete even not, easily come off, wear resisting property does not improve, and although traditional phosphate conversion and chromating process for treating surface can obtain good effect, but contain zinc in the waste liquid of discharging in treating processes, manganese, nickel, the carcinogenic substances such as the heavy metal ion such as chromium and submicro rare earth, environmental pollution is very serious, and metallic surface silanization treatment technology is due to the material of hurm involved environment not, energy consumption in production process is low, technical applications is extensive, being considered to be expected to replace phosphate conversion processes and chromating processing, that recent development direction is protected separately in metallic surface.

Summary of the invention

The object of the invention is just to provide a kind of trace rare-earth aluminum alloy surface treatment agent.

The present invention is achieved by the following technical solutions:

A kind of trace rare-earth aluminum alloy surface treatment agent, it is made up of the raw material of following weight parts:

Phosphorous acid 1-2, citric acid lanthanum 0.01-0.04, cerium citrate 0.02-0.03, hydrolytic polymaleic anhydride 1-2, tetramethylolmethane 2-3.1, Amino Trimethylene Phosphonic Acid 2-3, trimeric cyanamide 0.1-0.4, aluminum nitride powder 0.2-0.3, ethylene bis stearamide 0.6-1, ethylene glycol 2-3.5, tributyl tin trichloride 0.2-0.3, film coalescence aid 2-3,3-TSL 8330 10-13, two (the silica-based propyl group of γ-triethoxy) tetrasulfide 5-8, deionized water 110-140;

Described film coalescence aid is made up of the raw material of following weight parts:

Acrylate and vinyl acetate emulsion 25-30, tea saponin 1-2, pyrrolidone hydroxy acid sodium 1-2, hydroxy silicon oil 0.1-0.3, trimethylene phosphonic 2-3, allyl polyglycol 0.7-1, Zinic stearas 0.3-0.4,1,2 dimethylimidazole 0.2-0.3, deionized water 80-90;

Pyrrolidone hydroxy acid sodium is joined in acrylate and vinyl acetate emulsion, add hydroxy silicon oil, 100-200 rev/min of dispersed with stirring 3-5 minute;

Tea saponin is mixed with allyl polyglycol, add the 40-60% of above-mentioned deionized water weight, at 60-70 DEG C, be uniformly mixed 6-10 minute, add Zinic stearas, 100-200 rev/min of dispersed with stirring 4-6 minute;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 400-600 rev/min of dispersed with stirring 20-30 minute, obtains described film coalescence aid.

A preparation method for trace rare-earth aluminum alloy surface treatment agent, comprises the following steps:

Citric acid lanthanum, cerium citrate are mixed, after stirring, add the 40-50% of hydrolytic polymaleic anhydride, aluminum nitride powder, above-mentioned deionized water weight, two (the silica-based propyl group of γ-triethoxy) tetrasulfide, 400-500 rev/min of dispersed with stirring 20-30 minute;

Tetramethylolmethane is mixed with tributyl tin trichloride, join in remaining deionized water, after stirring, add trimeric cyanamide, stir;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 400-600 rev/min of dispersed with stirring 1-2 hour, obtains described trace rare-earth aluminum alloy surface treatment agent.

Advantage of the present invention is:

Citric acid lanthanum, cerium citrate good water solubility that surface treatment agent of the present invention adds, improved the consistency of each storeroom, improved surperficial resistance and the weathering resistance of film, makes film even, smooth, stable.

Embodiment

Embodiment 1

A kind of trace rare-earth aluminum alloy surface treatment agent, it is made up of the raw material of following weight parts:

Phosphorous acid 2, citric acid lanthanum 0.04, cerium citrate 0.03, hydrolytic polymaleic anhydride 2, tetramethylolmethane 2.1, Amino Trimethylene Phosphonic Acid 2, trimeric cyanamide 0.4, aluminum nitride powder 0.3, ethylene bis stearamide 0.6, ethylene glycol 3.5, tributyl tin trichloride 0.3, film coalescence aid 2,3-TSL 8330 13, two (the silica-based propyl group of γ-triethoxy) tetrasulfide 5, deionized water 140;

Described film coalescence aid is made up of the raw material of following weight parts:

Acrylate and vinyl acetate emulsion 30, tea saponin 2, pyrrolidone hydroxy acid sodium 2, hydroxy silicon oil 0.3, trimethylene phosphonic 2, allyl polyglycol 0.7, Zinic stearas 0.4,1,2 dimethylimidazole 0.3, deionized water 90;

Pyrrolidone hydroxy acid sodium is joined in acrylate and vinyl acetate emulsion, add hydroxy silicon oil, 100 revs/min of dispersed with stirring 3 minutes;

Tea saponin is mixed with allyl polyglycol, add 60% of above-mentioned deionized water weight, at 70 DEG C, be uniformly mixed 10 minutes, add Zinic stearas, 200 revs/min of dispersed with stirring 4 minutes;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 600 revs/min of dispersed with stirring 20 minutes, obtain described film coalescence aid.

A preparation method for trace rare-earth aluminum alloy surface treatment agent, comprises the following steps:

Citric acid lanthanum, cerium citrate are mixed, after stirring, add hydrolytic polymaleic anhydride, aluminum nitride powder, above-mentioned deionized water weight 50%, two (the silica-based propyl group of γ-triethoxy) tetrasulfide, 500 revs/min of dispersed with stirring 30 minutes;

Tetramethylolmethane is mixed with tributyl tin trichloride, join in remaining deionized water, after stirring, add trimeric cyanamide, stir;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 600 revs/min of dispersed with stirring 2 hours, obtain described trace rare-earth aluminum alloy surface treatment agent.

Using method:

The Al alloy parts carrying out after degreasing, washing is placed in to surface treatment agent of the present invention and floods, working temperature 20-40 DEG C, working hour 0.5-1min.

Performance test:

Getting the aluminum alloy plate materials of surface treatment agent processing of the present invention tests, the specification of this sheet material is 80mm × 100mm × 4mm, by this sheet material lateral dissection, carry out spray test, agents useful for same is that concentration is 5% sodium chloride solution, test period 300 hours, measures the bubbling width forming in line of cut one side, and result bubbling width is 0;

Salt tolerance:

It is in 5% sodium chloride solution that this sheet material is immersed in to concentration, soaks 300 hours, and material surface is substantially unchanged, soaks 300 hours, occurs without rust staining;

Acid resistance:

This sheet material is sprayed to experiment with the 0.05mol/l sulfuric acid that temperature is 23 DEG C, and experimental period 20 hours, cleans with clear water, and indoor placement 2 hours, coating surface was unchanged, and nothing is bubbled, nothing comes off, nothing is damaged;

Stripper-resistance:

The paste that this plate surface is coated with to last layer 2-3mm, being put into temperature is 50 DEG C, and in the watertight chest that relative humidity is 90-96%, experimental period 24 hours, cleans with clear water after taking-up, and coating surface is without bubbling, without coming off, without damaged.

Claims (2)

1. a trace rare-earth aluminum alloy surface treatment agent, is characterized in that what it was made up of the raw material of following weight parts:

Phosphorous acid 1-2, citric acid lanthanum 0.01-0.04, cerium citrate 0.02-0.03, hydrolytic polymaleic anhydride 1-2, tetramethylolmethane 2-3.1, Amino Trimethylene Phosphonic Acid 2-3, trimeric cyanamide 0.1-0.4, aluminum nitride powder 0.2-0.3, ethylene bis stearamide 0.6-1, ethylene glycol 2-3.5, tributyl tin trichloride 0.2-0.3, film coalescence aid 2-3,3-TSL 8330 10-13, two (the silica-based propyl group of γ-triethoxy) tetrasulfide 5-8, deionized water 110-140;

Described film coalescence aid is made up of the raw material of following weight parts:

Acrylate and vinyl acetate emulsion 25-30, tea saponin 1-2, pyrrolidone hydroxy acid sodium 1-2, hydroxy silicon oil 0.1-0.3, trimethylene phosphonic 2-3, allyl polyglycol 0.7-1, Zinic stearas 0.3-0.4,1,2 dimethylimidazole 0.2-0.3, deionized water 80-90;

Pyrrolidone hydroxy acid sodium is joined in acrylate and vinyl acetate emulsion, add hydroxy silicon oil, 100-200 rev/min of dispersed with stirring 3-5 minute;

Tea saponin is mixed with allyl polyglycol, add the 40-60% of above-mentioned deionized water weight, at 60-70 DEG C, be uniformly mixed 6-10 minute, add Zinic stearas, 100-200 rev/min of dispersed with stirring 4-6 minute;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 400-600 rev/min of dispersed with stirring 20-30 minute, obtains described film coalescence aid.

2. a preparation method for trace rare-earth aluminum alloy surface treatment agent as claimed in claim 1, is characterized in that comprising the following steps:

Citric acid lanthanum, cerium citrate are mixed, after stirring, add the 40-50% of hydrolytic polymaleic anhydride, aluminum nitride powder, above-mentioned deionized water weight, two (the silica-based propyl group of γ-triethoxy) tetrasulfide, 400-500 rev/min of dispersed with stirring 20-30 minute;

Tetramethylolmethane is mixed with tributyl tin trichloride, join in remaining deionized water, after stirring, add trimeric cyanamide, stir;

Above-mentioned each raw material after treatment is mixed with the each raw material of residue, and 400-600 rev/min of dispersed with stirring 1-2 hour, obtains described trace rare-earth aluminum alloy surface treatment agent.