CN102527609A - Treating process before spraying aluminum profile - Google Patents
Treating process before spraying aluminum profile Download PDFInfo
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- CN102527609A CN102527609A CN2012100644828A CN201210064482A CN102527609A CN 102527609 A CN102527609 A CN 102527609A CN 2012100644828 A CN2012100644828 A CN 2012100644828A CN 201210064482 A CN201210064482 A CN 201210064482A CN 102527609 A CN102527609 A CN 102527609A
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- hole
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- oxidation
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Abstract
The invention discloses a treating process before spraying an aluminum profile. Before spraying, a blank is subjected to treatment of deoiling, alkaline degreasing, neutralizing, oxidizing a positive electrode and sealing half of a hole, so that a semi-closed oxidized film is formed on the surface of the blank; and the oxidization treatment is that: the blank is put into H2SO4 with the concentration of between 160 and 180 g/L, the oxidization temperature is of between 18 and 22 DEG C, and the current density is of between 140 and 160 A/dm<2>. By adoption of the oxidization treatment step, the formed semi-closed oxidized film has a pore structure, so that a good attachment condition is supplied to paints; furthermore, compared with a non-closed oxidized film, the semi-closed oxidized film has the advantages that: impurities, such as dust and the like, cannot be attached to the surface of the profile easily before the profile is sprayed, and a subsequent spraying effect can be guaranteed. Meanwhile, a chromizing treatment step is avoided, and the finally obtained aluminum profile product does not contain chromium; and therefore, the aluminum profile can meet a non-chromizing requirement, and is relatively safe and environment-friendly.
Description
Technical field
The present invention relates to the spraying technology field of aluminium section bar, relate in particular to a kind of aluminium section bar of aluminium section bar Chrome-free that makes and spray preceding treatment process.
Background technology
Shape is with the characteristics of its excellent durability, ornamental and processing forming; Be widely used in industry-by-industries such as building, and aluminium section bar is because of its excellent processing performance, characteristics such as light weight; Consumption accounts for more than 80% of shape; Wherein fluorine carbon application aluminium section bar can reach 10～15 years service life, and rich color, more can satisfy people to variation and personalized pursuit.Aluminium section bar application front surface is handled and is adopted oil removing, chromaking, stoving process to handle usually, and wherein the chromaking processing is with the Cr in the chromaking liquid
6+Deng the chemical reaction of composition and a series of complicacies of section bar aluminium surface generation, make the section bar surface generate the loose chromate conversion coating that hole is arranged of one deck, thereby make the aluminium section bar base material good adhesive force arranged, but the conversion film that is generated contains Cr with coating
6+And Cr
3+, have very strong toxicity, especially Cr
6+Belong to carcinogen, a series of policies that national governments formulate adopt this kind technology in some domain restrictions, and chromate is classified as utmost point drugs by Epas such as the U.S.; On February 13rd, 2003; " the The Restriction of the use of certain Hazardous substances in Electnical and Electronic " that European Union passes through; In promptly " in electronic electric equipment, limiting the instruction of using some harmful substance ", Cr
6+Classified as harmful substance; And existing this technology, it is produced waste liquid and contains a large amount of Cr
6+And Cr
3+, it is complicated to dispose waste liquid.The domestic many local governments of China consider Cr in traditional chromating
6+And Cr
3+Environmental hazard and the difficulty of improvement and supervision; Launch respectively strict restriction and adopted traditional environmental protection policy that contains chromium passivating technology; How aluminium section bar manufacturing enterprise actively and scientifically responds national local environment protection laws and regulations under the prerequisite that guarantees the product quality and the market competitiveness, adopt non-chromium inactivating technique economically; Comply with the social development trend, become the problem that is worth the thinking of aluminium section bar enterprise.Along with country encourages promoting the use of of energy-saving and environmental protection product, the range of application of Chrome-free section bar will constantly enlarge.
Summary of the invention
In view of this, the object of the present invention is to provide the preceding treatment process of a kind of aluminium section bar spraying, abandon chromaking treatment step of the prior art, form the oxide-film of half sealing of hole, for coating provides the good condition of adhering to.
For solving the problems of the technologies described above, technical scheme of the present invention is:
Treatment process before the spraying of a kind of aluminium section bar comprises the processing of oil removing, alkali erosion, neutralization, oxidation, half sealing of hole to blank before spraying, make blank surface form half sealing of hole oxide-film, and wherein, oxidation processes is: blank is put into the H of 160g/L～180g/L
2SO
4In, the temperature of oxidation is 18 ℃～22 ℃, current density is 140A/dm
2～160A/dm
2
Preferably, after oil removing, before the alkali erosion, proceed to few once washing, before alkali erosion back, neutralization, proceed to few twice washing; After neutralization, before the oxidation, proceed to few once washing, after oxidation, before half sealing of hole, proceed to few twice washing, behind half sealing of hole, proceed to few once washing.
Preferably, after oxidation, carry out twice washing before half sealing of hole.
Preferably, the thickness of half sealing of hole oxide-film of formation is 4 μ m～6 μ m.
Preferably, said half sealing of hole is treated to: is that 58 ℃～66 ℃, mass concentration are to soak 3～4 minutes in the nickel acetate of 0.9g/l～1.5g/l with blank in temperature.
Compared with prior art; The present invention adopts oxidation treatment step; The half sealing of hole oxide-film that forms has pore structure, for coating provides the good condition of adhering to, and with respect to sealing of hole oxide-film not; Make section bar be difficult for being stained with dust and other impurities not spraying front surface, can guarantee follow-up spraying effect.Simultaneously, owing to abandoned the chromaking treatment step, the aluminium profile product that finally obtains does not contain chromium, thereby can also satisfy no chromaking requirement, safer, environmental protection.
The specific embodiment
In order to make those skilled in the art understand technical scheme of the present invention better, the present invention is described in further detail below by concrete embodiment.
Treatment process before the aluminium section bar spraying in the present embodiment in turn includes the following steps:
Oil removing, washing for the first time, alkali erosion, for the second time, wash for the third time, neutralize, the 4th washing, oxidation, the 5th washing, the 6th washing, half sealing of hole, washing, drip-dry, undercarriage, then can carry out follow-up spray treatment.
That wherein, oil removing, neutralization, oxidation are used is the H of mass concentration as 160g/l～180g/l
2SO
4, the temperature of oil removing, neutralization is a room temperature; The concrete operations mode of oil removing, neutralization all can adopt the technical scheme of this area in the prior art, repeats no more here.
Wherein, oxidation processes is specially: the H that blank is put into 160g/L
2SO
4In, the temperature of oxidation is 19 ℃, current density is 140A/dm
2In other embodiments, H
2SO
4Concentration also can be any value of 160g/L～180g/L, like 165g/L, 170g/L, 175g/L, 180g/L, the temperature of oxidation can be any value in 18 ℃～22 ℃, as 18 ℃, 19 ℃, 20 ℃, 22 ℃; Current density can be 140A/dm
2～160A/dm
2In any one the value, like 140A/dm
2, 145A/dm
2, 150A/dm
2, 155A/dm
2, 160A/dm
2
Wherein, half sealing of hole is handled and to be specially: is that 60 ℃, mass concentration are to soak 3 minutes in the nickel acetate of 1.2g/l with blank in temperature; In other embodiments, the soaking temperature of blank can be any value in 58 ℃～66 ℃, as 58 ℃, 60 ℃, 62 ℃, 64 ℃, 66 ℃; The mass concentration of nickel acetate can be any value among 0.9g/l～1.5g/l, like 0.9g/l, 1.0g/l, 1.2g/l, 1.3g/l, 1.4g/l, 1.5g/l.
Wherein, the step of spray treatment comprises that pure water is washed, dry, lacquer wet film, lacquer dry film, curing, and specifically the technology of each step is following:
Pure water is washed: pure water conductance＜30 μ s/cm, room temperature, 1～2 minute;
Dry: drying is 20～25 minutes under 35 ℃～45 ℃ temperature;
Paint film wet-film thickness: priming paint 23 μ m～33 μ m, finish paint 66 μ m～83 μ m, coating varnish 26 μ m～33 μ m;
Flow time: priming paint 6.5min～8min, finish paint 6.5min～8min, coating varnish 13min～17min;
Paint film build: priming paint 7～10 μ m, finish paint 20～25 μ m, coating varnish 8～10 μ m;
Electrostatic potential :-50KV～-70KV
Solidify: temperature: 225 ℃～240 ℃; Time: 8min～10min.
Below double sealing of hole oxide-film set forth as the mechanism of articulamentum:
The surface is cellular after the blank oxidation, if sealing of hole not, oxide-film then be not prone to make substrate surface to be stained with dust and other impurities before the spraying, easy-clear not when washing.If adopt full sealing of hole, oxide-film is the imporosity structure then, is prone to cause the coating adhesion property defective.In the present embodiment blank after the oxidation being carried out half sealing of hole handles; Half sealing of hole processing procedure is specially: blank is inserted in the sealing of hole groove, be provided with the nickel acetate that mass concentration is 0.9g/l～1.5g/l in the sealing of hole groove, the control nickel acetate soaked blank 3 minutes down for 58 ℃～66 ℃ in temperature; Make blank surface half sealing of hole; Generate half sealing of hole oxide-film below 4～6 μ m at last,, realize the no chromium process of aluminium section bar application production as the articulamentum of coating and base material.
Aluminium section bar chromate conversion coating of the prior art has pore structure, and the aluminium section bar anode half sealing of hole oxide-film that present embodiment forms has pore structure equally, can substitute chromate conversion coating thereby half sealing of hole oxide-film is set in the present embodiment.Present embodiment has changed the pre-treatment mode; With the articulamentum of half sealing of hole oxide-film below 4～6 μ m as coating and base material; Facts have proved: the oxide-film thickness is in 4～6 μ m; Can not cause defective, adopt half hole-sealing technology oxide-film can compare favourably with traditional chromaking treatment effect durability of coating to coating performance.Simultaneously, itself has protective effect oxide-film, and does not contain the management and control heavy metal, and is environmentally friendly.The half sealing of hole oxide-film that adopts is owing to have pore structure, thereby the good condition of adhering to is provided for coating.
More than the present invention has been carried out detailed introduction, use concrete example in the literary composition principle of the present invention and embodiment set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (5)
1. the treatment process before an aluminium section bar sprays; It is characterized in that, before spraying, blank comprised the processing of oil removing, alkali erosion, neutralization, oxidation, half sealing of hole, make blank surface form half sealing of hole oxide-film; Wherein, oxidation processes is: blank is put into the H of 160g/L～180g/L
2SO
4In, the temperature of oxidation is 18 ℃～22 ℃, current density is 140A/dm
2～160A/dm
2
2. based on the treatment process before the spraying of the described aluminium section bar of claim 1, it is characterized in that, after oil removing, before the alkali erosion, proceed to few once washing, before alkali erosion back, neutralization, proceed to few twice washing; After neutralization, before the oxidation, proceed to few once washing, after oxidation, before half sealing of hole, proceed to few twice washing, behind half sealing of hole, proceed to few once washing.
3. the treatment process before the aluminium section bar according to claim 1 spraying is characterized in that, after oxidation, before half sealing of hole, carries out twice washing.
4. the treatment process before the aluminium section bar spraying according to claim 1 is characterized in that the thickness of half sealing of hole oxide-film of formation is 4 μ m～6 μ m.
5. the treatment process before the aluminium section bar according to claim 1 spraying is characterized in that said half sealing of hole is treated to: is that 58 ℃～66 ℃, mass concentration are to soak 3～4 minutes in the nickel acetate of 0.9g/L～1.5g/L with blank in temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100644828A CN102527609A (en) | 2012-03-12 | 2012-03-12 | Treating process before spraying aluminum profile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100644828A CN102527609A (en) | 2012-03-12 | 2012-03-12 | Treating process before spraying aluminum profile |
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| CN102527609A true CN102527609A (en) | 2012-07-04 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032351A (en) * | 2014-06-06 | 2014-09-10 | 临朐仁和金属制品有限公司 | Production method of aluminum alloy frame |
| CN104357844A (en) * | 2014-10-29 | 2015-02-18 | 凤城太平洋神龙增压器有限公司 | Overprinting process for impeller of air compressor |
| CN106311582A (en) * | 2016-09-23 | 2017-01-11 | 北京新能源汽车股份有限公司 | Coating method for light vehicle body and light vehicle body |
| CN106498469A (en) * | 2016-09-30 | 2017-03-15 | 北京小米移动软件有限公司 | The manufacture method of metal-back, metal-back and terminal |
| CN106917125A (en) * | 2015-12-28 | 2017-07-04 | 华荣科技股份有限公司 | A kind of process of surface treatment of multi-functional comprehensive control maneuvering platform |
| CN106987881A (en) * | 2017-03-10 | 2017-07-28 | 福建省闽发铝业股份有限公司 | A kind of weatherproof color shape bars in aluminium alloy and preparation method thereof |
| CN107523852A (en) * | 2017-09-14 | 2017-12-29 | 福建奋安铝业有限公司 | A kind of high-performance aluminum section bar oxidation technology |
| CN107740153A (en) * | 2017-09-06 | 2018-02-27 | 深圳市德兴创科技有限公司 | A kind of aluminium base process of surface treatment |
| CN109023497A (en) * | 2017-06-09 | 2018-12-18 | 深圳富泰宏精密工业有限公司 | The production method of shell and the shell |
| CN109183111A (en) * | 2018-08-03 | 2019-01-11 | 昆山品钰康机电设备有限公司 | A kind of automobile interior exterior decoration process of surface treatment of aluminium alloy |
| CN109513587A (en) * | 2018-12-29 | 2019-03-26 | 安徽科蓝特铝业有限公司 | A kind of zero-fault zero diopter Electrostatic Spraying of powder Coatings coating method |
| CN109675779A (en) * | 2018-12-28 | 2019-04-26 | 广东兴发铝业（河南）有限公司 | A kind of processing method of fluorine carbon dust Spray-painted aluminum profile |
| CN113289877A (en) * | 2021-05-08 | 2021-08-24 | 浙江万丰摩轮有限公司 | Preparation method of motorcycle hub with nano coating |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032351A (en) * | 2014-06-06 | 2014-09-10 | 临朐仁和金属制品有限公司 | Production method of aluminum alloy frame |
| CN104357844A (en) * | 2014-10-29 | 2015-02-18 | 凤城太平洋神龙增压器有限公司 | Overprinting process for impeller of air compressor |
| CN106917125A (en) * | 2015-12-28 | 2017-07-04 | 华荣科技股份有限公司 | A kind of process of surface treatment of multi-functional comprehensive control maneuvering platform |
| CN106311582A (en) * | 2016-09-23 | 2017-01-11 | 北京新能源汽车股份有限公司 | Coating method for light vehicle body and light vehicle body |
| CN106498469A (en) * | 2016-09-30 | 2017-03-15 | 北京小米移动软件有限公司 | The manufacture method of metal-back, metal-back and terminal |
| CN106987881A (en) * | 2017-03-10 | 2017-07-28 | 福建省闽发铝业股份有限公司 | A kind of weatherproof color shape bars in aluminium alloy and preparation method thereof |
| CN109023497A (en) * | 2017-06-09 | 2018-12-18 | 深圳富泰宏精密工业有限公司 | The production method of shell and the shell |
| CN107740153A (en) * | 2017-09-06 | 2018-02-27 | 深圳市德兴创科技有限公司 | A kind of aluminium base process of surface treatment |
| CN107523852A (en) * | 2017-09-14 | 2017-12-29 | 福建奋安铝业有限公司 | A kind of high-performance aluminum section bar oxidation technology |
| CN109183111A (en) * | 2018-08-03 | 2019-01-11 | 昆山品钰康机电设备有限公司 | A kind of automobile interior exterior decoration process of surface treatment of aluminium alloy |
| CN109675779A (en) * | 2018-12-28 | 2019-04-26 | 广东兴发铝业（河南）有限公司 | A kind of processing method of fluorine carbon dust Spray-painted aluminum profile |
| CN109513587A (en) * | 2018-12-29 | 2019-03-26 | 安徽科蓝特铝业有限公司 | A kind of zero-fault zero diopter Electrostatic Spraying of powder Coatings coating method |
| CN113289877A (en) * | 2021-05-08 | 2021-08-24 | 浙江万丰摩轮有限公司 | Preparation method of motorcycle hub with nano coating |
| CN113289877B (en) * | 2021-05-08 | 2022-04-01 | 浙江万丰摩轮有限公司 | Preparation method of motorcycle hub with nano coating |
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Application publication date: 20120704 |