CN106555215A - A kind of aluminium alloy surface treatment method - Google Patents
A kind of aluminium alloy surface treatment method Download PDFInfo
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- CN106555215A CN106555215A CN201510631797.XA CN201510631797A CN106555215A CN 106555215 A CN106555215 A CN 106555215A CN 201510631797 A CN201510631797 A CN 201510631797A CN 106555215 A CN106555215 A CN 106555215A
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Abstract
The invention discloses a kind of aluminium alloy surface treatment method.The method includes defat, and alkali cleaning, electrolysis, anodic oxidation are dried five steps.Using the aluminium alloy surface treatment method of the present invention, can effectively improve the stability of aluminum alloy surface and corrosion-resistant, the service life of raising aluminum alloy materials.
Description
Technical field
The invention belongs to aluminum alloy materials technical field, more particularly to a kind of aluminium alloy surface treatment method.
Background technology
Aluminum and aluminum alloy mateial density is little, and intensity is high, conductive, excellent thermal conductivity, plasticity and good moldability, without black brittleness, easy processing.Aluminum alloy materials have been widely used in building at present, and aviation is military, automobile, navigation, in the field such as medical treatment.Then the wearability of aluminum is poor, and corrosion potential is relatively born, and is easily corroded in an atmosphere.Aluminium alloy under field conditions (factors), easily forms one layer of natural oxide-film on surface, and its thickness is about 4nm, porous and uneven.The oxide-film is insufficiently resistant to the corrosion under severe environmental conditions.Simultaneously because aluminum alloy materials are it occur frequently that abrasion is damaged.Therefore aluminium alloy is meeting its adaptability and safety to environment using front having to pass through corresponding surface special handling.Aluminium alloy surface treatment method can improve the barrier propterty of aluminium alloy, and ornamental and feature overcomes the shortcoming of aluminum alloy surface performance, expands the range of application of aluminium alloy, postpone its service life.
Chinese patent 201410167929.3, a kind of entitled aluminium alloy surface treatment method, the present invention provide a kind of aluminium alloy surface treatment method, including：The degreasing bath for loading degreasant solution is provided, ungrease treatment is made to aluminum alloy surface in degreasing bath；The degreasant solution is made up of water, degreasing agent and additive；The table tune groove that load table adjusts solution is provided, is adjusted in groove in table and reason is mediated to aluminum alloy surface tabulation；The table is adjusted solution to be adjusted by water and table and is constituted；The chromaking groove for loading chromaking solution is provided, chromate treating is made to aluminum alloy surface in chromaking groove；The chromaking solution is made up of pure distilled water and chromaking agent；After multiple tracks so process, aluminum alloy surface treatment effect is good, and whole free from admixture solves existing problem well.Its deficiency is to employ heavy metal chromium solution easily to produce pollution to environment.
Chinese patent 201410573896.2, entitled aluminum alloy materials and its surface treatment method, the present invention relates to aluminum alloy materials and its surface treatment method, the component of aluminum alloy materials is respectively：Lithium, zinc, copper, silicon, manganese, magnesium, titanium, boron, germanium and molybdenum, remaining composition are aluminum.The surface treatment method of aluminum alloy materials, comprises the following steps：（1）Remove the surface film oxide of aluminum alloy materials；（2）By step（1）The aluminum alloy materials of gained carry out chemical plating.The comprehensive various aspects of performance that improve aluminum alloy materials of the invention, strengthens the mechanical strength and tensile property of aluminium alloy, improves tensile strength, yield limit and the heat resistance of aluminum alloy materials.The surface treatment method of the present invention, is conducive to improving stablizing for aluminum alloy surface so that aluminum alloy material surface is brighter, and aesthetic property is good.Its deficiency is that the surface film oxide for obtaining is relatively thin, it is difficult to adapt to severe complex environment.
The content of the invention
In view of the shortcomings of the prior art, the present invention seeks to provide a kind of aluminium alloy surface treatment method, it is to realize above-mentioned purpose of the invention, the present invention is adopted the following technical scheme that.
A kind of aluminium alloy surface treatment method is comprised the steps of.
Step 1：Defat：The purpose of ungrease treatment is the technological lubrication oil for removing aluminium material surface, antirust oil and other dirts, to ensure the aluminium homogeneous corrosion in caustic corrosion operation.Aluminium alloy is put in organic solvent degreasing agent carries out ungrease treatment, makes full use of organic solvent degreasing agent to be soluble in organic solvent this feature.Organic solvent can be dissolved in saponified oil, can also be dissolved in non-soap carburetion, with very strong degreasing power.
Step 2：Al-alloy products after the agent of step 1 organic solvent degreasing is processed are difficult completely to remove impurity and greasy dirt of aluminum alloy surface etc..Aluminum alloy surface easily need to be processed using alkalescence; typically the NaOH of 25-100g/L is adopted for processing solution; its objective is to remove the remaining dirt of aluminium material surface, and by the base metal under aluminum alloy materials oxide film protection thoroughly it is exposed out, so as to the process of next step.Aluminum hydroxide precipitation is then produced when molten aluminum amount reaches 30g/L in aqueous slkali, bottom land is piled up in and is formed rigid solid thing.In order to prevent precipitation, typically add sodium citrate and sodium gluconate aborning（1.5g/L）.When molten aluminum amount reaches 50g/L, now tank liquor serious aging needs to be changed.
Step 3：The aluminum alloy materials that step 2 is obtained are put in the soft water of boiling or are placed in vapor, its surface natural oxide film progressive additive, the reaction of this change is.
Cathode reaction has hydrogen evolution.
Such that it is able to form hydroxide Al (OH)3.When the thickness of thin film increases to a certain ultimate value, because thin film has been fully dense no hole, solution cannot contact the reaction with internal aluminium alloy element to be terminated.
Step 4：The aluminium alloy obtained by step 3 is used as anodized.Using aluminium alloy as anode in electrolytic solution.Using the high material of the chemical stabilities such as lead as negative electrode.Further aluminum oxide film can be formed in aluminum alloy product surface after energization.
Step 5：Aluminium alloy obtained by step 4 is put in drying oven and is dried process, finally give finished product aluminum alloy materials.
Specific embodiment
Step 1：Defat：The purpose of ungrease treatment is the technological lubrication oil for removing aluminium material surface, antirust oil and other dirts, to ensure the aluminium homogeneous corrosion in caustic corrosion operation.Aluminium alloy is put in organic solvent degreasing agent carries out ungrease treatment, makes full use of organic solvent degreasing agent to be soluble in organic solvent this feature.Organic solvent can be dissolved in saponified oil, can also be dissolved in non-soap carburetion, with very strong degreasing power.
Further, the solution composition that the degreasing agent is adopted for：H3PO4:10%；Butanol：20%；Isopropanol：30%；Water：20%.
Further, the soak time of the degreasing agent is adopted for 8min.
Step 2：Al-alloy products after the agent of step 1 organic solvent degreasing is processed are difficult completely to remove impurity and greasy dirt of aluminum alloy surface etc..Aluminum alloy surface easily need to be processed using alkalescence; typically the NaOH of 25-100g/L is adopted for processing solution; its objective is to remove the remaining dirt of aluminium material surface, and by the base metal under aluminum alloy materials oxide film protection thoroughly it is exposed out, so as to the process of next step.Aluminum hydroxide precipitation is then produced when molten aluminum amount reaches 30g/L in aqueous slkali, bottom land is piled up in and is formed rigid solid thing.In order to prevent precipitation, typically add sodium citrate and sodium gluconate aborning（1.5g/L）.When molten aluminum amount reaches 50g/L, now tank liquor serious aging needs to be changed.
Further, the alkaline solution is consisted of：NaOH:5.0%；NaF：2.0%；Na5P3O10：0.2%；Wetting agent：0.2%.
Further, the soak time of the alkaline solution is adopted for 5min.
Step 3：The aluminum alloy materials that step 2 is obtained are put in the soft water of boiling or are placed in vapor, its surface natural oxide film progressive additive, the reaction of this change is.
Cathode reaction has hydrogen evolution.
Such that it is able to form hydroxide Al (OH)3.When the thickness of thin film increases to a certain ultimate value, because thin film has been fully dense no hole, solution cannot contact the reaction with internal aluminium alloy element to be terminated.
Step 4：The aluminium alloy obtained by step 3 is used as anodized.Using aluminium alloy as anode in electrolytic solution.Using the high material of the chemical stabilities such as lead as negative electrode.Further aluminum oxide film can be formed in aluminum alloy product surface after energization.
Step 5：Aluminium alloy obtained by step 4 is put in drying oven and is dried process, finally give finished product aluminum alloy materials.
Claims (1)
1. a kind of aluminium alloy surface treatment method is comprised the steps of：
Step 1：Defat：The purpose of ungrease treatment is the technological lubrication oil for removing aluminium material surface, antirust oil and other dirts, to ensure the aluminium homogeneous corrosion in caustic corrosion operation, aluminium alloy is put in organic solvent degreasing agent carries out ungrease treatment, organic solvent degreasing agent is made full use of to be soluble in organic solvent this feature, organic solvent can be dissolved in saponified oil, can also be dissolved in non-soap carburetion, with very strong degreasing power；
Step 2：Al-alloy products after the agent of step 1 organic solvent degreasing is processed are difficult completely to remove impurity and greasy dirt of aluminum alloy surface etc., aluminum alloy surface easily need to be processed using alkalescence, typically the NaOH of 25-100g/L is adopted for processing solution, its objective is to remove the remaining dirt of aluminium material surface, and by the base metal under aluminum alloy materials oxide film protection thoroughly it is exposed out, so as to the process of next step, aluminum hydroxide precipitation is produced when molten aluminum amount reaches 30g/L in aqueous slkali then, it is piled up in bottom land and forms rigid solid thing, in order to prevent precipitation, it is general to add sodium citrate and sodium gluconate aborning（1.5g/L）, when molten aluminum amount reaches 50g/L, now tank liquor serious aging needs to be changed；
Step 3：The aluminum alloy materials that step 2 is obtained are put in the soft water of boiling or are placed in vapor, its surface natural oxide film progressive additive, the reaction of this change is：
Cathode reaction has hydrogen evolution：
Such that it is able to form hydroxide Al (OH)3
When the thickness of thin film increases to a certain ultimate value, because thin film has been fully dense no hole, solution cannot contact the reaction with internal aluminium alloy element to be terminated；
Step 4：The aluminium alloy obtained by step 3 further can form aluminum oxide film in aluminum alloy product surface after energization as anodized using aluminium alloy as anode in electrolytic solution, using the high material of the chemical stabilities such as lead as negative electrode；
Step 5：Aluminium alloy obtained by step 4 is put in drying oven and is dried process, finally give finished product aluminum alloy materials.
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| CN201510631797.XA CN106555215A (en) | 2015-09-29 | 2015-09-29 | A kind of aluminium alloy surface treatment method |
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Application publication date: 20170405 |