CN102424999B - A kind of aluminium alloy anode oxide film electrolytic the treatment process of black - Google Patents
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black Download PDFInfo
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Abstract
The invention discloses the treatment process that a kind of aluminium alloy anode oxide film electrolytic black, belong to technical field of surface.The method comprises pre-treatment, anodic oxidation, ac electrolytic coloring and closes; Electrolytic colouring liquid consists of SnSO
410 ~ 15g/L, H
2sO
413 ~ 17g/L, NiSO
410 ~ 20g/L, NiCl
25 ~ 8g/L, tartrate 1 ~ 2g/L and cerous sulfate 0.1 ~ 0.2g/L; The coloring process parameter that alternating current electrolysis black is: alternating current voltage is 10 ~ 14V, and coloring liquid temperature is 16 ~ 24 DEG C, coloration time 16 ~ 22min.By the method obtain the film pure color of electrolytic blackening after aluminium alloy anode oxide evenly, fine and smooth bright and clean; The voltage range obtaining fine and smooth bright and clean black film during electrolytic coloring widens nearly one times, and the ability of the resistance to 3.5% sodium-chlor corrosion of black film improves 30%.
Description
Technical field
The invention belongs to technical field of surface, relate generally to the treatment process that a kind of aluminium alloy anode oxide film electrolytic black; It is the improvement of black technique about aluminium alloy anode oxide film electrolytic.
Background technology
Aluminum-aluminum alloy electrolytic coloring technique functions comes from the Europe of the forties in last century, is a kind of important channel of aluminium surfacecti proteon and ornamental process.In alloy colouring treatment technology, true black rete in occupation of critical role, become the fashion trend of European & American Market in recent years gradually.What facts have proved that the rotproofness of aluminum alloy surface Electrolytically coloured film, weathering resistance, resistance to opticity and work-ing life all will be good than dyeing film in a large number is many, but the aspects such as the colourity of black film outward appearance, homogeneity and weathering resistance are usually unsatisfactory, and especially aterrimus film difficulty is very large to obtain uniform and stable black film.After tradition aluminium alloy anode oxide, the voltage range of electrolytic blackening is narrow, and the painted black film obtained often occurs that black is impure, burnt hair or send out the shortcomings such as brown.
Summary of the invention
Goal of the invention:
The present invention is directed to the voltage range of electrolytic blackening after traditional aluminium alloy anode oxide narrow, the painted black film obtained often occurs that black is impure, burnt hair or send out the shortcomings such as brown, there is provided a kind of aluminium alloy anode oxide film electrolytic the treatment process of black, efficiently solve the problems referred to above.
Technical scheme is:
Aluminium alloy anode oxide film electrolytic a treatment process for black, and the method is made up of pre-treatment, anodic oxidation, ac electrolytic coloring and closed four steps; It is characterized in that: electrolytic colouring liquid consists of SnSO
410 ~ 15g/L, H
2sO
413 ~ 17g/L, NiSO
410 ~ 20g/L, NiCl
25 ~ 8g/L, tartrate 1 ~ 2g/L and cerous sulfate 0.1 ~ 0.2g/L; The coloring process parameter that alternating current electrolysis black is: alternating current voltage is 10 ~ 14V, and coloring liquid temperature is 16 ~ 24 DEG C, coloration time 16 ~ 22min, the aluminium alloy after anodic oxidation as negative electrode, aluminium electrode as anode, cathode/annode ratio 1:1.
Pre-treatment step is as follows:
(1), aluminum alloy surface is except oxide compound after washing;
(2), the mixing solutions of aluminium alloy employing 30g/L sodium hydroxide and 25g/L sodium carbonate carries out alkaline degreasing, taking-up washing after 1min;
(3), by aluminium alloy be immersed in alkaline etching in 50g/L sodium hydroxide solution, after 1min, take out washing;
(4), by aluminium alloy be immersed in residual alkali being carried out in 200mL/L salpeter solution and bright dipping, after 1min, take out washing, dry.
Anodization step is as follows:
Aluminium alloy after pre-treatment is as anode, and Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+170g/L sulfuric acid anodizing solution in carry out anodic oxidation 40min, oxidation voltage is direct current 15V.
Close step as follows: boiling water closes 20min; Take out, dry.
embodiment:
Aluminium alloy anode oxide film electrolytic a treatment process for black, is made up of pre-treatment, anodic oxidation, ac electrolytic coloring and closed four steps:
First in a traditional way carry out pre-treatment, step is as follows:
(1) aluminum alloy surface is except oxide compound after washing; (2) mixing solutions of aluminium alloy employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, takes out washing after 1min; (3) aluminium alloy is immersed in alkaline etching in sodium hydroxide (50g/L) solution, after 1min, takes out washing; (4) aluminium alloy is immersed in salpeter solution (200mL/L), residual alkali is carried out in and bright dipping, after 1min take out washing, dry.
After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.
Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, under the coloring process parameter of following electrolytic blackening, carries out electrolytic coloring in the coloring liquid of electrolytic blackening.
The after washing that coloring film is painted, then carries out boiling water and closes 20min; Take out, dry.
The coloring process parameter of above-mentioned electrolytic blackening is: alternating current voltage is 10 ~ 14V, and coloring liquid temperature is 16 ~ 24 DEG C, coloration time 16 ~ 22min.
The coloring liquid of above-mentioned electrolytic blackening consists of: SnSO
410 ~ 15g/L, H
2sO
413 ~ 17g/L, NiSO
410 ~ 20g/L, NiCl
25 ~ 8g/L, tartrate 1 ~ 2g/L and cerous sulfate 0.1 ~ 0.2g/L.
The outfit method of the electrolytic colouring liquid that above-mentioned aluminium alloy anode oxide film electrolytic involved by the treatment process of black is: by SnSO
4be dissolved in and add a small amount of H
2sO
4distilled water in, NiSO
4, NiCl
2, tartrate and cerous sulfate be that solvent dissolves respectively with distilled water, then each dissolution homogeneity is mixed, in solution upon mixing, adds surplus H
2sO
4, finally supplement surplus with distilled water.
Below by specific embodiment, the present invention is described in further detail; the present invention is not limited to following specific embodiment; under the ambit that the claims in the present invention are protected, can also make the concrete conversion of various ways, these all belong to protection scope of the present invention.
Experimental example 1:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
412g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
415g/L, NiCl
27g/L, tartrate 1.5g/L and cerous sulfate 0.15g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
412g/L, H
2sO
415g/L, NiSO
415g/L, NiCl
27g/L, tartrate 1.5g/L and cerous sulfate 0.15g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 13V, and coloring liquid temperature is 20 DEG C, coloration time 20min.
Experimental example 2:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
412g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
418g/L, NiCl
25g/L, tartrate 1.5g/L and cerous sulfate 0.20g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
412g/L, H
2sO
415g/L, NiSO
418g/L, NiCl
25g/L, tartrate 1.5g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 12V, and coloring liquid temperature is 20 DEG C, coloration time 20min.
Experimental example 3:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
413g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
415g/L, NiCl
27g/L, tartrate 1.0g/L and cerous sulfate 0.2g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
413g/L, H
2sO
415g/L, NiSO
415g/L, NiCl
27g/L, tartrate 1g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 12V, and coloring liquid temperature is 20 DEG C, coloration time 20min.
Experimental example 4:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
412g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
415g/L, NiCl
27g/L, tartrate 1.5g/L and cerous sulfate 0.15g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
412g/L, H
2sO
415g/L, NiSO
415g/L, NiCl
27g/L, tartrate 1.5g/L and cerous sulfate 0.15g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 14V, and coloring liquid temperature is 18 DEG C, coloration time 18min.
Experimental example 5:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
412g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
418g/L, NiCl
25g/L, tartrate 1.5g/L and cerous sulfate 0.20g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
412g/L, H
2sO
415g/L, NiSO
418g/L, NiCl
25g/L, tartrate 1.5g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 10V, and coloring liquid temperature is 22 DEG C, coloration time 20min.
Experimental example 6:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
413g/L is dissolved in and adds 3g/LH
2sO
4distilled water in, NiSO
415g/L, NiCl
27g/L, tartrate 1.0g/L and cerous sulfate 0.2g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
412g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
413g/L, H
2sO
415g/L, NiSO
415g/L, NiCl
27g/L, tartrate 1.0g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 12V, and coloring liquid temperature is 22 DEG C, coloration time 16min.
Experimental example 7:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
415g/L is dissolved in and adds 4g/LH
2sO
4distilled water in, NiSO
410g/L, NiCl
28g/L, tartrate 2.0g/L and cerous sulfate 0.1g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
413g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
415g/L, H
2sO
417g/L, NiSO
410g/L, NiCl
28g/L, tartrate 2.0g/L and cerous sulfate 0.1g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 10V, and coloring liquid temperature is 24 DEG C, coloration time 22min.
Experimental example 8:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
415g/L is dissolved in and adds 4g/LH
2sO
4distilled water in, NiSO
410g/L, NiCl
28g/L, tartrate 2.0g/L and cerous sulfate 0.1g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
413g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
415g/L, H
2sO
417g/L, NiSO
410g/L, NiCl
28g/L, tartrate 2.0g/L and cerous sulfate 0.1g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 14V, and coloring liquid temperature is 16 DEG C, coloration time 22min.
Experimental example 9:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
410g/L is dissolved in and adds 2g/LH
2sO
4distilled water in, NiSO
420g/L, NiCl
26g/L, tartrate 2.0g/L and cerous sulfate 0.2g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
411g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
410g/L, H
2sO
413g/L, NiSO
420g/L, NiCl
26g/L, tartrate 2.0g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 13V, and coloring liquid temperature is 24 DEG C, coloration time 16min.
Experimental example 10:
A kind of aluminium alloy anode oxide film electrolytic the treatment process of black, first by pretreatment of aluminum alloy: surface is except oxide compound after washing, the mixing solutions of employing sodium hydroxide (30g/L), sodium carbonate (25g/L) carries out alkaline degreasing, washing is taken out after 1min, be immersed in alkaline etching in sodium hydroxide (50g/L) solution, washing is taken out after 1min, be immersed in residual alkali being carried out in salpeter solution (200mL/L) and bright dipping, take out washing after 1min, dry.After pre-treatment, using aluminum alloy specimen as anode, Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+the anodizing solution of 170g/L sulfuric acid carry out anodic oxidation 40min, oxidation voltage is direct current 15V.Aluminium alloy after anodic oxidation is as negative electrode, and aluminium electrode is as anode, and cathode/annode ratio 1:1, carries out ac electrolytic coloring in the coloring liquid of electrolytic blackening, with distillation washing after coloring film is painted, then carries out boiling water and closes 20min, take out, dries.
Coloring liquid is by SnSO
410g/L is dissolved in and adds 2g/LH
2sO
4distilled water in, NiSO
420g/L, NiCl
26g/L, tartrate 2.0g/L and cerous sulfate 0.2g/L are that solvent dissolves respectively, then mixed by each dissolution homogeneity with distilled water, add H in solution upon mixing
2sO
411g/L, finally supplements surplus with distilled water and is mixed with and forms.The electrolytic colouring liquid obtained consists of: SnSO
410g/L, H
2sO
413g/L, NiSO
420g/L, NiCl
26g/L, tartrate 2.0g/L and cerous sulfate 0.2g/L.
The coloring process parameter of electrolytic blackening, is characterized in that: alternating current voltage is 12V, and coloring liquid temperature is 24 DEG C, coloration time 18min.
Conclusion: the experiment proved that, by the inventive method obtain the film pure color of electrolytic blackening after aluminium alloy anode oxide evenly, fine and smooth bright and clean; The voltage range obtaining fine and smooth bright and clean black film during electrolytic coloring widens nearly one times, the ability of resistance to 3.5% sodium-chlor of black film improves 30%, efficiently solve the voltage range of electrolytic blackening after traditional aluminium alloy anode oxide narrow, the painted black film obtained often occur that black is impure, burnt hair or send out the problems such as brown.
Corrosion current contrast following (by Tafel polarization curve obtained): the I of sample after painted in 3.5%NaCl solution
1during for traditional optimal processing parameter; I
2during for this experimental technique parameter.
Claims (4)
1. aluminium alloy anode oxide film electrolytic a treatment process for black, and the method is made up of pre-treatment, anodic oxidation, ac electrolytic coloring and closed four steps; It is characterized in that: electrolytic colouring liquid consists of SnSO
410 ~ 15g/L, H
2sO
413 ~ 17g/L, NiSO
410 ~ 20g/L, NiCl
25 ~ 8g/L, tartrate 1 ~ 2g/L and cerous sulfate 0.1 ~ 0.2g/L; The coloring process parameter that alternating current electrolysis black is: alternating current voltage is 10 ~ 14V, and coloring liquid temperature is 16 ~ 24 DEG C, coloration time 16 ~ 22min, the aluminium alloy after anodic oxidation as negative electrode, aluminium electrode as anode, cathode/annode ratio 1:1.
2. a kind of aluminium alloy anode oxide film electrolytic the treatment process of black according to claim 1, it is characterized in that: pre-treatment step is as follows:
(1), aluminum alloy surface is except oxide compound after washing;
(2), the mixing solutions of aluminium alloy employing 30g/L sodium hydroxide and 25g/L sodium carbonate carries out alkaline degreasing, taking-up washing after 1min;
(3), by aluminium alloy be immersed in alkaline etching in 50g/L sodium hydroxide solution, after 1min, take out washing;
(4), by aluminium alloy be immersed in residual alkali being carried out in 200mL/L salpeter solution and bright dipping, after 1min, take out washing, dry.
3. a kind of aluminium alloy anode oxide film electrolytic the treatment process of black according to claim 1, it is characterized in that: anodization step is as follows:
Aluminium alloy after pre-treatment is as anode, and Graphite Electrodes is as negative electrode, and cathode/annode ratio 1:1, at room temperature, in containing Al
3+170g/L sulfuric acid anodizing solution in carry out anodic oxidation 40min, oxidation voltage is direct current 15V.
4. a kind of aluminium alloy anode oxide film electrolytic the treatment process of black according to claim 1, it is characterized in that: close step as follows: boiling water closes 20min; Take out, dry.
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|---|---|---|---|---|
| FR2990615B1 (en) * | 2012-05-16 | 2015-07-31 | Seb Sa | PROCESS FOR OBTAINING A COOKING CONTAINER HAVING AN ELECTROCHEMICALLY COLORED ANODIZED EXTERIOR |
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