CN104361836B - 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 PDFInfo
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- CN104361836B CN104361836B CN201410666531.4A CN201410666531A CN104361836B CN 104361836 B CN104361836 B CN 104361836B CN 201410666531 A CN201410666531 A CN 201410666531A CN 104361836 B CN104361836 B CN 104361836B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005554 pickling Methods 0.000 title claims abstract description 33
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 71
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000005488 sandblasting Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims abstract description 6
- 229910000679 solder Inorganic materials 0.000 claims description 21
- 239000011241 protective layer Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 9
- 229910002114 biscuit porcelain Inorganic materials 0.000 claims description 9
- 241001465754 Metazoa Species 0.000 claims description 6
- 239000013527 degreasing agent Substances 0.000 claims description 6
- 238000005237 degreasing agent Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000002480 mineral oil Substances 0.000 claims description 6
- 235000010446 mineral oil Nutrition 0.000 claims description 6
- 230000002000 scavenging effect Effects 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229910001586 aluminite Inorganic materials 0.000 abstract 4
- 238000003466 welding Methods 0.000 abstract 2
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 238000005238 degreasing Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating 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
- G09F9/33—Indicating 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C22/00—Chemical 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
- C23C22/05—Chemical 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
- C23C22/06—Chemical 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
- C23C22/07—Chemical 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
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
-
- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23F—NON-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
- C23F17/00—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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
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
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 be in design by the installation requirement of display screen and display size and ambient color depending on, on the premise of ensureing to have enough installation strength, reduce the erection weight of display screen as far as possible.
Three kinds of ways are generally had: black aluminium alloy, aluminium alloy stainless steel outer packed (sub-light, light) and fabrication are integrated for indoor display screen housing.
Black aluminum alloy outer frame simple in construction, housing color is close to display screen background color.
The stainless steel outer packed framework of aluminium alloy, uses wire drawing rustless steel, beautiful, generous.
Fabrication integral structure, its color is Sony's ash, easily by visual reception.Additionally compact in terms of overall structure, there is no gap.Its shortcoming is that the size to display screen requires.
Being to ensure there are enough installation strength for outdoor display screen, its housing is steel construction, and external decoration is selected generally according to field condition and customer requirement, generally uses 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 be with disposed at equal distance lines, in accordance with aesthetic.
In prior art, LED display frame structure all pursues the features such as light, thin, therefore, being difficult to take into account the requirement of electromagnetic shielding, most of LED display casings the most do not possess the feature of electromagnetic shielding, or the poor effect of electromagnetic shielding, meanwhile, the surface lacquer of casing easily comes off.
Summary of the invention
The technical problem to be solved is: provide a kind of acid washing phosphorization method of LED display cast iron casing, solves LED display casing in prior art and does not possess electromagnetic shielding or the problem of effectiveness difference.
The present invention solves above-mentioned technical problem by the following technical solutions:
A kind of acid washing phosphorization method of LED display cast iron casing; include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; include aluminium-plated bisque the most successively before pickling after the washing of described first time, ground connection solder joint, the technique arranging protective layer, surface sand-blasting on ground connection solder joint are set on aluminium powder layer; wherein
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat is used for removing surface 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 for forming black phosphating film in tank surface；
Aluminium-plated bisque is used for forming radiation protective layer；
Ground connection solder joint is set for by casing ground connection, formation zero-potential point；
Ground connection solder joint is arranged and protective layer used is grit blasted process on ground connection solder joint in preventing；
Surface sand-blasting is used for strengthening tank surface frictional force.
Described defat uses 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 uses the dilute hydrochloric acid of 5%～10%, and pickling time is 2～5 minutes.
Described pickling uses the dilute hydrochloric acid of 5%, and pickling time is 5 minutes.
Described phosphatization uses 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.
The industrial tap water that the washing of described first time, second time washing, third time washing, the 4th washing all use pH value to be 6～7, scavenging period is 1～2 minute.
Compared with prior art, the method have the advantages that
1, add aluminium powder layer, and earth point be set at aluminium powder layer so that this casing can effective ground connection, there is good effectiveness, it is to avoid radiation.
2, the casing resistance to corrosion using the method to carry out processing strengthens, it is not easy to get rusty, and the black of casing is not easy to come off, and effectively protects the electronic devices and components of LED display, improves the life-span of LED display.
3, using PZn-9 to strengthen as bonderite, the casing resistance to corrosion after phosphatization, tank surface is not easy to fade, and tank surface is smooth.
Detailed description of the invention
Structure and work process to the present invention are described further below.
A kind of acid washing phosphorization method of LED display cast iron casing; include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; include aluminium-plated bisque the most successively before pickling after the washing of described first time, ground connection solder joint, the technique arranging protective layer, surface sand-blasting on ground connection solder joint are set on aluminium powder layer; wherein
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat is used for removing surface 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 for forming black phosphating film in tank surface；
Aluminium-plated bisque is used for forming radiation protective layer；
Ground connection solder joint is set for by casing ground connection, formation zero-potential point；
Ground connection solder joint is arranged and protective layer used is grit blasted process on ground connection solder joint in preventing；
Surface sand-blasting is used for strengthening tank surface frictional force.
Described defat uses 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 uses the dilute hydrochloric acid of 5%～10%, and pickling time is 2～5 minutes.
Described pickling uses the dilute hydrochloric acid of 5%, and pickling time is 5 minutes.
Described phosphatization uses 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.
The industrial tap water that the washing of described first time, second time washing, third time washing, the 4th washing all use pH value to be 6～7, scavenging period is 1～2 minute.
Specific embodiment one,
A kind of acid washing phosphorization method of LED display cast iron casing; include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; include aluminium-plated bisque the most successively after the washing of described first time, ground connection solder joint, the technique arranging protective layer, surface sand-blasting on ground connection solder joint are set on aluminium powder layer; wherein
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat uses POH-11 degreasing agent, and pH value is 11, and temperature is 70 degree, and the time is 8 minutes, is used for removing surface animals and plants, mineral oil；
Pickling uses the dilute 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 uses PZn-9, and phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C, for forming black phosphating film in tank surface；
The washing of described first time, second time washing, third time washing, the 4th washing all use 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; include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; include aluminium-plated bisque the most successively after the washing of described first time, ground connection solder joint, the technique arranging protective layer, surface sand-blasting on ground connection solder joint are set on aluminium powder layer; wherein
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat uses POH-11 degreasing agent, and pH value is 13, and temperature is 60 degree, and the time is 12 minutes, is used for removing surface animals and plants, mineral oil；
Pickling uses the dilute 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 uses PZn-9, and phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C, for forming black phosphating film in tank surface；
The washing of described first time, second time washing, third time washing, the 4th washing all use 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; include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively; include aluminium-plated bisque the most successively after the washing of described first time, ground connection solder joint, the technique arranging protective layer, surface sand-blasting on ground connection solder joint are set on aluminium powder layer; wherein
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat uses POH-11 degreasing agent, and pH value is 12, and temperature is 65 degree, and the time is 10 minutes, is used for removing surface animals and plants, mineral oil；
Pickling uses the dilute 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 uses PZn-9, and phosphating time is 6 minutes, and phosphatization temperature is 42 DEG C, for forming black phosphating film in tank surface；
The washing of described first time, second time washing, third time washing, the 4th washing all use 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 so that this casing can effective ground connection, there is good effectiveness, it is to avoid radiation.
The casing resistance to corrosion using the method to carry out processing strengthens, it is not easy to get rusty, and the black of casing is not easy to come off, and effectively protects the electronic devices and components of LED display, improves the life-span of LED display.
Using PZn-9 to strengthen as bonderite, the casing resistance to corrosion after phosphatization, tank surface is not easy to fade, and tank surface is smooth.
Claims (3)
1. the acid washing phosphorization method of a LED display cast iron casing, include surface process, defat, washing for the first time, pickling, second time washing, table tune, third time washing, phosphatization, the 4th washing, hot water wash, dewatering process successively, it is characterized in that: described defat uses POH-11 degreasing agent, pH value is 11～13, temperature is 60～70 degree, and the time is 8～12 minutes；Described pickling uses the dilute hydrochloric acid of 5%～10%, and pickling time is 2～5 minutes；Described phosphatization uses PZn-9, and phosphating time is 5～10 minutes, and phosphatization temperature is 40～45 DEG C；The industrial tap water that the washing of described first time, second time washing, third time washing, the 4th washing all use pH value to be 6～7, scavenging period is 1～2 minute；Include aluminium-plated bisque after the washing of described first time before pickling the most successively, aluminium powder layer arrange ground connection solder joint, the technique of protective layer, surface sand-blasting is set on ground connection solder joint, wherein,
Surface processes and is used for removing surface dust, greasy dirt, burr, rusty stain；
Defat is used for removing surface 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 for forming black phosphating film in tank surface；
Aluminium-plated bisque is used for forming radiation protective layer；
Ground connection solder joint is set for by casing ground connection, formation zero-potential point；
Ground connection solder joint is arranged and protective layer used is grit blasted process on ground connection solder joint in preventing；
Surface sand-blasting is used for strengthening tank surface frictional force.
The acid washing phosphorization method of LED display cast iron casing the most according to claim 1, it is characterised in that: described pickling uses the dilute hydrochloric acid of 5%, and pickling time is 5 minutes.
The acid washing phosphorization method of LED display cast iron casing the most according to claim 1, it is characterised in that: phosphating time is 5 minutes, and phosphatization temperature is 45 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN104361836A CN104361836A (en) | 2015-02-18 |
| CN104361836B true CN104361836B (en) | 2017-01-11 |
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| CN201410666531.4A Expired - Fee Related 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 (5)
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060099332A1 (en) * | 2004-11-10 | 2006-05-11 | Mats Eriksson | Process for producing a repair coating on a coated metallic surface |
| DE102008015104A1 (en) * | 2008-03-19 | 2009-09-24 | Basf Coatings Ag | Coating composition, process for its preparation, its use and substrates coated therewith |
-
2014
- 2014-11-20 CN CN201410666531.4A patent/CN104361836B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
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