CN104361836A - Pickling and phosphating method of light-emitting diode (LED) display screen cast iron box body - Google Patents

Pickling and phosphating method of light-emitting diode (LED) display screen cast iron box body Download PDF

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Publication number
CN104361836A
CN104361836A CN201410666531.4A CN201410666531A CN104361836A CN 104361836 A CN104361836 A CN 104361836A CN 201410666531 A CN201410666531 A CN 201410666531A CN 104361836 A CN104361836 A CN 104361836A
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China
Prior art keywords
washing
time
pickling
cast iron
phosphatization
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Granted
Application number
CN201410666531.4A
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Chinese (zh)
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CN104361836B (en
Inventor
沈智广
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Qingdao Shunyi Sen Intelligent Electronic Technology Co., Ltd.
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WUXI COCIS ELECTRONICS SCIENCE AND TECHNOLOGY Co Ltd
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Priority to CN201410666531.4A priority Critical patent/CN104361836B/en
Publication of CN104361836A publication Critical patent/CN104361836A/en
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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08Orthophosphates
    • C23C22/12Orthophosphates containing zinc cations
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00Coating starting from inorganic powder
    • C23C24/02Coating starting from inorganic powder by application of pressure only
    • C23C24/04Impact or kinetic deposition of particles
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F17/00Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25

Abstract

The invention discloses a pickling and phosphating method of a light-emitting diode (LED) display screen cast iron box body. The method sequentially comprises the steps of surface treatment, degreasing, washing for the first time, pickling, washing for the second time, surface conditioning, washing for the third time, phosphating, washing for the fourth time, washing by hot water, and dewatering; after washing for the first time, the method also sequentially comprises the steps of spraying an aluminite powder layer, arranging a grounded welding spot on the aluminite powder layer, arranging a protection layer on the grounded welding spot, and sandblasting the surface. The aluminite powder layer is additionally arranged, and the grounded point is arranged on the aluminite powder layer, so that the box body can be effectively grounded, and has a good electromagnetic shielding effect, and radiation is avoided.

Description

A kind of acid washing phosphorization method of LED display cast iron casing
Technical field
The invention belongs to field of LED display, be specifically related to a kind of acid washing phosphorization method of LED display cast iron casing.
Background technology
At present, LED display frame structure is determined by the installation requirement of display screen and display size and ambient color in design, under the prerequisite ensuring enough installation strength, reduces the erection weight of display screen as far as possible.  
Usually three kinds of ways are had: black aluminium alloy, aluminium alloy stainless steel outer packed (sub-light, light) and fabrication integration for indoor display screen housing.
Black aluminum alloy outer frame structure is simple, and housing color is close to display screen background color.
The stainless steel outer packed framework of aluminium alloy, adopts wire drawing stainless steel, attractive in appearance, generous.
Fabrication integral structure, its color is Sony's ash, easily by visual reception.Compact in one-piece construction in addition, there is no gap.Its shortcoming has requirement to the size of display screen.
Be ensure enough installation strength for outdoor display screen, its housing is steel construction, and external decoration is selected according to field condition and customer requirement usually, usually adopts outsourcing aluminium-plastic panel.Its advantage is as follows:
Aluminium-plastic panel color is various, wide in variety, can require to choose according to difference;
Aluminium-plastic panel surface quality is high, and roughness is little;
Aluminium-plastic panel can realize glue-line splicing, and surface can disposed at equal distance lines, conform with aesthetic.
In prior art, LED display frame structure all pursues the features such as light, thin, therefore, be difficult to the requirement taking into account electromagnetic screen, most of LED display casing does not all possess the feature of electromagnetic screen, or the poor effect of electromagnetic screen, meanwhile, the surface lacquer of casing easily comes off.
Summary of the invention
Technical matters to be solved by this invention is: a kind of acid washing phosphorization method providing LED display cast iron casing, solves LED display casing in prior art and does not possess the problem of electromagnetic screen or effectiveness difference.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of acid washing phosphorization method of LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint before pickling after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing is for removing surperficial animals and plants, mineral oil;
Pickling is for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization is used for forming black phosphating film in tank surface;
Aluminium-plated bisque is for the formation of radiation protective layer;
Ground connection solder joint is set for by casing ground connection, forms zero-potential point;
Ground connection solder joint is arranged protective layer used in preventing on ground connection solder joint by blasting treatment;
Surface sand-blasting is for strengthening tank surface friction force.
Described degreasing adopts POH-11 degreasing agent, and pH value is 11 ~ 13, and temperature is 60 ~ 70 degree, and the time is 8 ~ 12 minutes.
Described pickling adopts the watery hydrochloric acid of 5% ~ 10%, and pickling time is 2 ~ 5 minutes.
Described pickling adopts the watery hydrochloric acid of 5%, and pickling time is 5 minutes.
Described phosphatization adopts PZn-9, and phosphating time is 5 ~ 10 minutes, and phosphatization temperature is 40 ~ 45 DEG C.
Phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C.
Described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 6 ~ 7, and scavenging period is 1 ~ 2 minute.
Compared with prior art, the present invention has following beneficial effect:
1, add aluminium powder layer, and earth point is set at aluminium powder layer, make this casing can effective ground connection, there is good effectiveness, avoid radiation.
2, adopt the method to carry out the casing resistance to corrosion that processes to strengthen, be not easy to get rusty, and the black of casing is not easy to come off, the available protecting electronic devices and components of LED display, improve the life-span of LED display.
3, adopt PZn-9 as bonderite, the casing resistance to corrosion after phosphatization strengthens, and tank surface is not easy to fade, and tank surface is smooth.
Embodiment
Below structure of the present invention and the course of work are described further.
A kind of acid washing phosphorization method of LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint before pickling after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing is for removing surperficial animals and plants, mineral oil;
Pickling is for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization is used for forming black phosphating film in tank surface;
Aluminium-plated bisque is for the formation of radiation protective layer;
Ground connection solder joint is set for by casing ground connection, forms zero-potential point;
Ground connection solder joint is arranged protective layer used in preventing on ground connection solder joint by blasting treatment;
Surface sand-blasting is for strengthening tank surface friction force.
Described degreasing adopts POH-11 degreasing agent, and pH value is 11 ~ 13, and temperature is 60 ~ 70 degree, and the time is 8 ~ 12 minutes.
Described pickling adopts the watery hydrochloric acid of 5% ~ 10%, and pickling time is 2 ~ 5 minutes.
Described pickling adopts the watery hydrochloric acid of 5%, and pickling time is 5 minutes.
Described phosphatization adopts PZn-9, and phosphating time is 5 ~ 10 minutes, and phosphatization temperature is 40 ~ 45 DEG C.
Phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C.
Described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 6 ~ 7, and scavenging period is 1 ~ 2 minute.
Specific embodiment one,
A kind of acid washing phosphorization method of LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing adopts POH-11 degreasing agent, and pH value is 11, and temperature is 70 degree, and the time is 8 minutes, for removing surperficial animals and plants, mineral oil;
Pickling adopts the watery hydrochloric acid of 5%, and pickling time is 5 minutes, for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization adopts PZn-9, and phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C, for forming black phosphating film in tank surface;
Described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 7, and scavenging period is 1 minute.
Specific embodiment two,
A kind of acid washing phosphorization method of LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing adopts POH-11 degreasing agent, and pH value is 13, and temperature is 60 degree, and the time is 12 minutes, for removing surperficial animals and plants, mineral oil;
Pickling adopts the watery hydrochloric acid of 10%, and pickling time is 2 minutes, for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization adopts PZn-9, and phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C, for forming black phosphating film in tank surface;
Described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 6, and scavenging period is 2 minutes.
Specific embodiment three,
A kind of acid washing phosphorization method of LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing adopts POH-11 degreasing agent, and pH value is 12, and temperature is 65 degree, and the time is 10 minutes, for removing surperficial animals and plants, mineral oil;
Pickling adopts the watery hydrochloric acid of 8%, and pickling time is 3 minutes, for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization adopts PZn-9, and phosphating time is 6 minutes, and phosphatization temperature is 42 DEG C, for forming black phosphating film in tank surface;
Described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 6, and scavenging period is 1.5 minutes.
The LED box of this patent adds aluminium powder layer, and arranges earth point at aluminium powder layer, makes this casing can effective ground connection, has good effectiveness, avoids radiation.
Adopt the method to carry out the casing resistance to corrosion that processes to strengthen, be not easy to get rusty, and the black of casing is not easy to come off, the available protecting electronic devices and components of LED display, improve the life-span of LED display.
Adopt PZn-9 as bonderite, the casing resistance to corrosion after phosphatization strengthens, and tank surface is not easy to fade, and tank surface is smooth.

Claims (7)

1. the acid washing phosphorization method of a LED display cast iron casing; comprise surface treatment, degreasing, first time washing, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; it is characterized in that: the technique also comprising aluminium-plated bisque successively, aluminium powder layer arranges ground connection solder joint, protective seam, surface sand-blasting are set on ground connection solder joint before pickling after described first time washing; wherein
Surface treatment is for removing surface dust, greasy dirt, burr, rusty stain;
Degreasing is for removing surperficial animals and plants, mineral oil;
Pickling is for changing the character of tank surface;
Table is adjusted to the auxiliary process of phosphatization;
Phosphatization is used for forming black phosphating film in tank surface;
Aluminium-plated bisque is for the formation of radiation protective layer;
Ground connection solder joint is set for by casing ground connection, forms zero-potential point;
Ground connection solder joint is arranged protective layer used in preventing on ground connection solder joint by blasting treatment;
Surface sand-blasting is for strengthening tank surface friction force.
2. the acid washing phosphorization method of LED display cast iron casing according to claim 1, is characterized in that: described degreasing adopts POH-11 degreasing agent, and pH value is 11 ~ 13, and temperature is 60 ~ 70 degree, and the time is 8 ~ 12 minutes.
3. the acid washing phosphorization method of LED display cast iron casing according to claim 2, is characterized in that: described pickling adopts the watery hydrochloric acid of 5% ~ 10%, and pickling time is 2 ~ 5 minutes.
4. the acid washing phosphorization method of LED display cast iron casing according to claim 3, is characterized in that: described pickling adopts the watery hydrochloric acid of 5%, and pickling time is 5 minutes.
5. the acid washing phosphorization method of LED display cast iron casing according to claim 1, is characterized in that: described phosphatization adopts PZn-9, and phosphating time is 5 ~ 10 minutes, and phosphatization temperature is 40 ~ 45 DEG C.
6. the acid washing phosphorization method of LED display cast iron casing according to claim 5, it is characterized in that: phosphating time is 5 minutes, phosphatization temperature is 45 DEG C.
7. the acid washing phosphorization method of LED display cast iron casing according to claim 1, it is characterized in that: described first time washing, second time washing, third time washing, the 4th washing all adopt pH value to be the industrial tap water of 6 ~ 7, and scavenging period is 1 ~ 2 minute.
CN201410666531.4A 2014-11-20 2014-11-20 Pickling and phosphating method of light-emitting diode (LED) display screen cast iron box body Expired - Fee Related CN104361836B (en)

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CN201410666531.4A CN104361836B (en) 2014-11-20 2014-11-20 Pickling and phosphating method of light-emitting diode (LED) display screen cast iron box body

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1222585A (en) * 1997-11-14 1999-07-14 游天来 Metal surface treating method
DE19905479A1 (en) * 1999-02-10 2000-08-17 Metallgesellschaft Ag Process for the phosphatisation of zinc or aluminum surfaces
CN1476493A (en) * 2000-03-22 2004-02-18 ����ɳ�ع����޹�˾ Energy enhanced process for treating conductive surface and products formed thereby
CN1986882A (en) * 2005-12-22 2007-06-27 佛山市顺德区汉达精密电子科技有限公司 Chemical nickel plating process on magnesium alloy
CN101029401A (en) * 2006-02-27 2007-09-05 徐州正菱涂装有限公司 Pretreatment for coating iron and steel member
US20110020659A1 (en) * 2008-03-19 2011-01-27 Basf Coatings Gmbh Coating composition, method for the production thereof, use thereof, and substrates coated therewith
US20130108782A1 (en) * 2004-11-10 2013-05-02 Mats Eriksson Process for producing a repair coating on a coated metallic surface

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1222585A (en) * 1997-11-14 1999-07-14 游天来 Metal surface treating method
DE19905479A1 (en) * 1999-02-10 2000-08-17 Metallgesellschaft Ag Process for the phosphatisation of zinc or aluminum surfaces
CN1476493A (en) * 2000-03-22 2004-02-18 ����ɳ�ع����޹�˾ Energy enhanced process for treating conductive surface and products formed thereby
US20130108782A1 (en) * 2004-11-10 2013-05-02 Mats Eriksson Process for producing a repair coating on a coated metallic surface
CN1986882A (en) * 2005-12-22 2007-06-27 佛山市顺德区汉达精密电子科技有限公司 Chemical nickel plating process on magnesium alloy
CN101029401A (en) * 2006-02-27 2007-09-05 徐州正菱涂装有限公司 Pretreatment for coating iron and steel member
US20110020659A1 (en) * 2008-03-19 2011-01-27 Basf Coatings Gmbh Coating composition, method for the production thereof, use thereof, and substrates coated therewith

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Inventor after: Quan Lifeng

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Address before: 214028 Jiangsu Province, Wuxi New District No. 7 Changjiang Road, Science Park, No. two, No. 501

Patentee before: Wuxi Cocis Electronics Science and Technology Co., Ltd.

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