CN104894547A - Fluotitanate conversion fluid applied to surface of 6061 aluminum alloy and use method of fluotitanate conversion fluid - Google Patents
Fluotitanate conversion fluid applied to surface of 6061 aluminum alloy and use method of fluotitanate conversion fluid Download PDFInfo
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- CN104894547A CN104894547A CN201510341865.9A CN201510341865A CN104894547A CN 104894547 A CN104894547 A CN 104894547A CN 201510341865 A CN201510341865 A CN 201510341865A CN 104894547 A CN104894547 A CN 104894547A
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Abstract
The invention belongs to the technical field of metal material surface treatment technology, and particularly relates to a fluotitanate conversion fluid applied to the surface of a 6061 aluminum alloy and a use method of the fluotitanate conversion fluid. Each liter of the conversion fluid comprises raw material by weight as follows: 3 g of sodium fluoride, 4 g of ammonium fluorosilicate, 1.0 g of sodium hexametaphosphate, 1.5 g of titanium salt, 1.5 mg of hydrogen peroxide and the balance of water, wherein titanium salt is one of tetra-n-butyl titanate, titanium sulfate, titanyl sulfate and titanium chloride. Etched aluminum ions on the surface of the 6061 aluminum alloy participate in generation of a fluotitanate conversion coating at the normal temperature, so that particles on the coating are fine and compact, and the conversion coating is firmly combined with an aluminum alloy substrate and has characteristics of good corrosion resistance and high adhesive force when attached to an organic coating, and has the advantages of energy conservation, time saving, high production efficiency, low cost, simple process and stable performance.
Description
Technical field
The invention belongs to technical field of metal material surface treatment, be specifically related to a kind of the fluotitanate conversion fluid and the using method that are applied to 6061 aluminum alloy surface.
Background technology
Aluminium alloy in the fabrication process, owing to pursuing high mechanical property and over-all properties and adding various alloying element, as Zn, Mg, Cu, Si etc.The existence of these elements makes aluminium alloy internal chemical composition and uneven microstructure, makes aluminum alloy materials at environment for use (especially Cl
-under existent condition) in very easily cause micro-cell corrosion, affect the work-ing life of material.So the protection of Aluminum-aluminum alloy is more and more subject to people's attention.Chromating process is widely used in the surface treatment of aluminium alloy; but because sexavalent chrome is poisonous; along with the development of human society and the raising of scientific and technological level; the environmental protection consciousness of people is more and more stronger, and the substitution studies of carrying out chromating technology has become important direction, one, anticorrosive metal field and problem urgently to be resolved hurrily.After there is a series of chemical reaction and hydrolytic action in aluminium alloy and the treatment solution containing zirconate or titanate, what the conversion film generated was made up of with the complex compound etc. of fluorine aluminium sesquioxide, hydrated aluminum oxide, aluminium hydroxide, zirconium or titanium mixes inclusion film, this technique has simple to operate, the rete obtained and the advantage such as the bonding force of organic polymer is strong.
Summary of the invention
The object of the invention is to overcome defect of the prior art and provide a kind of aluminum ion making 6061 aluminum alloy surface be etched at normal temperatures to participate in the generation of fluotitanate conversion film, make membrane-coating granules tiny, fine and close, conversion film is combined firmly with the matrix of aluminium alloy own, corrosion resisting property is good, with the feature of organic coating strong adhesion, and have that energy-and time-economizing production efficiency is high, cost is low, technique is simple and the fluotitanate conversion fluid being applied to 6061 aluminum alloy surface of stable performance and using method.
The object of the present invention is achieved like this: the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, and surplus is water; Described titanium salt is tetra-n-butyl titanate, titanium sulfate, one of them of titanyl sulfate or titanium chloride.Described conversion fluid is pH value is 4.5 ~ 5.5, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is one of sulfuric acid or nitric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, this using method comprises the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 65 ~ 70 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 5 ~ 7min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 5 ~ 7min;
Step 3: be after 5%NaOH solution is heated to 65 ~ 70 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1 ~ 1.5min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 5 ~ 7min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 5 ~ 7min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 5 ~ 7min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 6 ~ 15min.
The present invention has the following advantages:
1, environment protecting and power-saving: (1), 6061 aluminum alloy surface fluotitanate conversion film technologies of preparing do not use sexavalent chrome, its conversion film generated is not also containing sexavalent chrome; (2), because fluorion is to the strong etching of aluminium alloy and formed rapidly and stablize fluorine aluminium complexing ion, fluotitanate conversion film can be formed rapidly in aluminum alloy surface under normal temperature condition, under described normal temperature condition, refer to 1 ~ 40 DEG C; (3), the present invention owing to playing the fluorion of corrasion, the aluminum ion that is etched all take part in conversion reaction, becomes a composition of conversion film, so waste resource is utilized effectively, the impact of waste liquid on environment also alleviates greatly.
2, economic, efficient, high-performance: fluorion is to the high stability of the strong etching of aluminium and fluorine aluminium complexing ion, and under making fluotitanate conversion film normal temperature condition, short 3 ~ 5min just can be formed in aluminum alloy surface; Energy-and time-economizing production efficiency is high, cost is low; Different from traditional chromate conversion technology, fluotitanate conversion film technology take part in the generation of fluotitanate conversion film due to aluminum ion itself that aluminum alloy surface is etched, make membrane-coating granules tiny, fine and close, conversion film is combined firmly with the matrix of aluminium alloy own, corrosion resisting property is good, with organic coating strong adhesion.
3, technique is simple, stable performance: because conversion reaction is carried out under normal temperature condition, the process operation parameter that treating processes uniquely controls is pH.Although aluminium etching process conversion fluid pH will rise, due to the consumption of sodium ion (or potassium, ammonium ion) in fluotitanate conversion film forming process, result will make conversion fluid pH in conversion reaction process not change, and stability of solution is good.Because conversion reaction is carried out under normal temperature condition, therefore, using method red-tape operati is simple, uses, easy to maintenance.
Embodiment
The present invention is the fluotitanate conversion fluid and the using method that are applied to 6061 aluminum alloy surface, the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, surplus is water; Described titanium salt is tetra-n-butyl titanate, titanium sulfate, one of them of titanyl sulfate or titanium chloride.Described conversion fluid is pH value is 4.5 ~ 5.5, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is one of sulfuric acid or nitric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, comprise the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 65 ~ 70 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 5 ~ 7min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 5 ~ 7min;
Step 3: be after 5%NaOH solution is heated to 65 ~ 70 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1 ~ 1.5min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 5 ~ 7min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 5 ~ 7min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 5 ~ 7min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 6 ~ 15min.
Turco 4215 NC-LT alkaline cleaner described in the present invention and Smut GoNC deoxidation/go out photo etching all commercially can directly purchase, therefore no longer repeat in the present invention.
In order to more detailed explanation the present invention, now the present invention is further elaborated in conjunction with the embodiments.Specific embodiment is as follows:
Embodiment 1
Be applied to a fluotitanate conversion fluid for 6061 aluminum alloy surface, the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, and surplus is water; Described titanium salt is tetra-n-butyl titanate.Described conversion fluid is pH value is 4.5, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is sulfuric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, comprise the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 65 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 5min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 5min;
Step 3: be after 5%NaOH solution is heated to 65 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 5min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 5min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 5min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 6min.
Embodiment 2
Be applied to a fluotitanate conversion fluid for 6061 aluminum alloy surface, the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, and surplus is water; Described titanium salt is titanium sulfate.Described conversion fluid is pH value is 5, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is nitric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, comprise the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 70 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 7min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 7min;
Step 3: be after 5%NaOH solution is heated to 70 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1.5min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 7min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 7min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 7min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 15min.
Embodiment 3
Be applied to a fluotitanate conversion fluid for 6061 aluminum alloy surface, the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, and surplus is water; Described titanium salt is titanyl sulfate.Described conversion fluid is pH value is 5.5, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is sulfuric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, comprise the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 67.5 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 6min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 6min;
Step 3: be after 5%NaOH solution is heated to 67.5 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1.25min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 6min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 6min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 6min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 10.5min.
Embodiment 4
Be applied to a fluotitanate conversion fluid for 6061 aluminum alloy surface, the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, and surplus is water; Described titanium salt is titanium chloride.Described conversion fluid is pH value is 4.8, and the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is nitric acid.
Be applied to a using method for the fluotitanate conversion fluid of 6061 aluminum alloy surface, comprise the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 65 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 7min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 6min;
Step 3: be after 5%NaOH solution is heated to 70 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5%NaOH solution cleans; Scavenging period is 1.5min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 5min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 7min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 5min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 6min.
By in above-described embodiment 1, embodiment 2, embodiment 3 and embodiment 4 through using 6061 aluminium alloys after the present invention to be positioned in 3.5%NaCl liquid complete immersion after 66 days, 6061 aluminum alloy surface in embodiment 1, embodiment 2, embodiment 3 and embodiment 4 are all non-foaming, 6061 aluminum alloy surface coating binding forces in embodiment 1, embodiment 2, embodiment 3 and embodiment 4 are excellent, the solidity to corrosion of embodiment 1 is good, and the solidity to corrosion of embodiment 2, embodiment 3 and embodiment 4 is excellent.
The fluotitanate conversion fluid being applied to 6061 aluminum alloy surface in the present invention is that its treatment solution is mainly main component with the fluorine-containing hydrochlorate of IVB (Ti, Zr and Ha etc.) and adds some additives in order to substitute poisonous developing containing chromium film; Its conversion film is made up of the oxide compound of Ti-Mg-Al and oxyhydroxide, and this film solidity to corrosion is good, and bonding force between organic coating is excellent.Titanium salt passive film is particularly suitable for the chemical passivation film forming process before Al-alloy parts japanning, the bonding force of coating and matrix can be increased, improve corrosion resistance nature simultaneously, passive film itself also has certain anti-corrosion capability, its anti-corrosion capability is close with chromic salt, can separately for the protection of the not high product of ask for something.In conversion process, the F-in conversion fluid first etches aluminum alloy surface and generates fine and close sodium fluoroaluminate crystal grain and transforms rete, and the TiO2 colloidal deposition that hydrofluotitanic acid root hydrolysis subsequently produces, at conversion film particle surface, makes the solidity to corrosion of conversion film strengthen.Using method of the present invention, embodiment 1, embodiment 2, embodiment 3 and the fluotitanate conversion fluid described in embodiment 4 are the abbreviation of the fluotitanate conversion fluid being applied to 6061 aluminum alloy surface.
A series of detailed description listed is above only illustrating for feasibility embodiment of the present invention; they are also not used to limit the scope of the invention, all do not depart from the skill of the present invention equivalent implementations done of spirit or change all should be included within protection scope of the present invention.
Claims (3)
1. one kind is applied to the fluotitanate conversion fluid of 6061 aluminum alloy surface, its feature exists: the formula of this conversion fluid is the raw material containing following weight in often liter of solution: Sodium Fluoride 3g, ammonium silicofluoride 4g, Sodium hexametaphosphate 99 1.0g, titanium salt 1.5g, hydrogen peroxide 1.5mg, surplus is water; Described titanium salt is tetra-n-butyl titanate, titanium sulfate, one of them of titanyl sulfate or titanium chloride.
2. the fluotitanate conversion fluid being applied to 6061 aluminum alloy surface according to claim 1, its feature exists: described conversion fluid is pH value is 4.5 ~ 5.5, the pH value of described conversion fluid is regulated by irreducibility acid, and described irreducibility acid is one of sulfuric acid or nitric acid.
3. the using method being applied to the fluotitanate conversion fluid of 6061 aluminum alloy surface as described in claim 1-2, this using method comprises the steps:
After step one: Turco 4215 NC-LT alkaline cleaner is heated to 65 ~ 70 DEG C, be positioned over by 6061 aluminium alloys in Turco 4215 NC-LT alkaline cleaner and clean, scavenging period is 5 ~ 7min;
Step 2: be positioned in clear water by 6061 aluminium alloys after cleaning described in step one and carry out a clean water, scavenging period is 5 ~ 7min;
Step 3: be after 5% NaOH solution is heated to 65 ~ 70 DEG C by massfraction, 6061 aluminium alloys after a clean water described in step 2 being positioned over massfraction is that 5% NaOH solution is cleaned; Scavenging period is 1 ~ 1.5min;
Step 4: be positioned in clear water by 6061 aluminium alloys after cleaning described in step 3 and carry out secondary clean water, scavenging period is 5 ~ 7min;
Step 5: 6061 aluminium alloys after the clean water of secondary described in step 4 are positioned over Smut GoNC deoxidation/go out in photo etching to carry out deoxidation/bright dipping, the time of deoxidation/bright dipping is 5 ~ 7min, and temperature is normal temperature;
Step 6: be positioned in clear water by 6061 aluminium alloys after carrying out deoxidation/bright dipping described in step 5 and carry out three clean water, scavenging period is 5 ~ 7min;
Step 7: be positioned in fluotitanate conversion fluid by 6061 aluminium alloys after three clean water described in step 6 and carry out passivation, soaks 6 ~ 15min.
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| CN105951090A (en) * | 2016-05-31 | 2016-09-21 | 刘洪建 | Passivation method of aluminium plate |
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