CN110644008A - Surface treatment process for large workpiece - Google Patents
Surface treatment process for large workpiece Download PDFInfo
- Publication number
- CN110644008A CN110644008A CN201910970739.8A CN201910970739A CN110644008A CN 110644008 A CN110644008 A CN 110644008A CN 201910970739 A CN201910970739 A CN 201910970739A CN 110644008 A CN110644008 A CN 110644008A
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- China
- Prior art keywords
- washing
- large workpiece
- acid
- workpiece
- surface treatment
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
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- 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
- C23C22/24—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 hexavalent chromium compounds
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- 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
- C23C22/82—After-treatment
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
Abstract
The invention discloses a surface treatment process of a large workpiece, wherein the large workpiece to be treated can be subjected to surface treatment only by the steps of S1. frosting, S2. acid spraying, S3. alkali washing, S4. washing, S5. passivating, S6. secondary washing and S7. air drying. The invention can effectively carry out surface treatment on large-sized workpieces by only homomorphic simple procedures, has low energy consumption in the treatment process, and can recycle consumables, thereby having lower cost.
Description
Technical Field
The invention relates to the field of surface treatment of metal workpieces, in particular to a surface treatment process of a large workpiece.
Background
The surface treatment is a process method for adding or subtracting on the surface of a base material to change the physical and chemical properties of the base material. The purpose of the surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of the product. The surface treatment of large workpieces is always a great problem in the industry, and the large workpieces cannot be soaked in a pickling tank due to the large surface area.
Disclosure of Invention
In view of the problems of the prior art, the present invention aims to provide a surface treatment process for a large workpiece, which can effectively perform surface treatment on the large workpiece.
In order to achieve the purpose, the invention adopts the technical scheme that: a surface treatment process of a large workpiece comprises the following steps:
s1, sanding: carrying out simple surface polishing on a large workpiece to be processed by using sand paper to remove surface rust and stains;
s2, acid spraying: spraying acid washing liquid onto the surface of the large workpiece by using an acid-resistant spray, wherein the acid washing liquid is 4.9-9.8% of sulfuric acid solution, and the retention time of the acid washing liquid is 6-10 minutes;
s3, alkaline washing: washing the surface of the large workpiece clean by using alkali liquor, wherein the alkali liquor is 2% of sodium hydroxide solution;
s4, washing: washing the large workpiece subjected to alkali washing with clear water;
s5, passivation: passivating the large-sized workpiece after washing by using a passivating agent, wherein the passivating agent is formed by dissolving and mixing magnesium chromate and sodium chromate in 100 parts of water according to the weight ratio of 5-7: 2;
s6, secondary washing: carrying out secondary washing on the passivated large workpiece, wherein the washing liquid is a 5% hydrogen peroxide solution;
s7, air drying: and (3) placing the large workpiece in a ventilation position, and finishing surface treatment after the large workpiece is air-dried.
Preferably, in the step S2, the acid washing solution used for acid spraying is a 7% sulfuric acid solution.
The invention can effectively carry out surface treatment on large-sized workpieces only through simple procedures, has low energy consumption in the treatment process, and can recycle consumables, thereby having lower cost.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A surface treatment process of a large workpiece comprises the following steps:
s1, sanding: carrying out simple surface polishing on a large workpiece to be processed by using sand paper to remove surface rust and stains;
s2, acid spraying: spraying acid washing liquid onto the surface of a large workpiece by using an acid-resistant spray, wherein the acid washing liquid is 9.8% sulfuric acid solution, and the retention time of the acid washing liquid is 10 minutes;
s3, alkaline washing: washing the surface of the large workpiece clean by using alkali liquor, wherein the alkali liquor is 2% of sodium hydroxide solution;
s4, washing: washing the large workpiece subjected to alkali washing with clear water;
s5, passivation: passivating the large-sized workpiece after washing by using a passivating agent, wherein the passivating agent is prepared by dissolving magnesium chromate and sodium chromate in 100 parts of water according to the weight ratio of 7:2 and mixing;
s6, secondary washing: carrying out secondary washing on the passivated large workpiece, wherein the washing liquid is a 5% hydrogen peroxide solution;
s7, air drying: and (3) placing the large workpiece in a ventilation position, and finishing surface treatment after the large workpiece is air-dried.
The surface treatment of large-sized workpieces can be effectively carried out by the step, the energy consumption in the treatment process is low, and the consumable materials can be recycled, so the cost is lower.
Example 2
A surface treatment process of a large workpiece comprises the following steps:
s1, sanding: carrying out simple surface polishing on a large workpiece to be processed by using sand paper to remove surface rust and stains;
s2, acid spraying: spraying acid washing liquid onto the surface of a large workpiece by using an acid-resistant spray, wherein the acid washing liquid is 4.9% sulfuric acid solution, and the retention time of the acid washing liquid is 6 minutes;
s3, alkaline washing: washing the surface of the large workpiece clean by using alkali liquor, wherein the alkali liquor is 2% of sodium hydroxide solution;
s4, washing: washing the large workpiece subjected to alkali washing with clear water;
s5, passivation: passivating the large-sized workpiece after washing by using a passivating agent, wherein the passivating agent is prepared by dissolving magnesium chromate and sodium chromate in 100 parts of water according to the weight ratio of 5:2 and mixing;
s6, secondary washing: carrying out secondary washing on the passivated large workpiece, wherein the washing liquid is a 5% hydrogen peroxide solution;
s7, air drying: and (3) placing the large workpiece in a ventilation position, and finishing surface treatment after the large workpiece is air-dried.
The surface treatment of large-sized workpieces can be effectively carried out by the step, the energy consumption in the treatment process is low, and the consumable materials can be recycled, so the cost is lower.
Example 3
A surface treatment process of a large workpiece comprises the following steps:
s1, sanding: carrying out simple surface polishing on a large workpiece to be processed by using sand paper to remove surface rust and stains;
s2, acid spraying: spraying acid washing liquid onto the surface of a large workpiece by using an acid-resistant spray, wherein the acid washing liquid is a 7% sulfuric acid solution, and the retention time of the acid washing liquid is 8 minutes;
s3, alkaline washing: washing the surface of the large workpiece clean by using alkali liquor, wherein the alkali liquor is 2% of sodium hydroxide solution;
s4, washing: washing the large workpiece subjected to alkali washing with clear water;
s5, passivation: passivating the large-sized workpiece after washing by using a passivating agent, wherein the passivating agent is prepared by dissolving magnesium chromate and sodium chromate in 100 parts of water according to the weight ratio of 3:1 and mixing;
s6, secondary washing: carrying out secondary washing on the passivated large workpiece, wherein the washing liquid is a 5% hydrogen peroxide solution;
s7, air drying: and (3) placing the large workpiece in a ventilation position, and finishing surface treatment after the large workpiece is air-dried.
The surface treatment of large-sized workpieces can be effectively carried out by the step, the energy consumption in the treatment process is low, and the consumable materials can be recycled, so the cost is lower.
Claims (2)
1. A surface treatment process of a large workpiece is characterized by comprising the following steps:
s1, sanding: carrying out simple surface polishing on a large workpiece to be processed by using sand paper to remove surface rust and stains;
s2, acid spraying: spraying acid washing liquid onto the surface of the large workpiece by using an acid-resistant spray, wherein the acid washing liquid is 4.9-9.8% of sulfuric acid solution, and the retention time of the acid washing liquid is 6-10 minutes;
s3, alkaline washing: washing the surface of the large workpiece clean by using alkali liquor, wherein the alkali liquor is 2% of sodium hydroxide solution;
s4, washing: washing the large workpiece subjected to alkali washing with clear water;
s5, passivation: passivating the large-sized workpiece after washing by using a passivating agent, wherein the passivating agent is formed by dissolving and mixing magnesium chromate and sodium chromate in 100 parts of water according to the weight ratio of 5-7: 2;
s6, secondary washing: carrying out secondary washing on the passivated large workpiece, wherein the washing liquid is a 5% hydrogen peroxide solution;
s7, air drying: and (3) placing the large workpiece in a ventilation position, and finishing surface treatment after the large workpiece is air-dried.
2. The surface treatment process for the large-sized workpiece according to claim 1, wherein the pickling solution used in the step S2. acid spraying is a 7% sulfuric acid solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970739.8A CN110644008A (en) | 2019-10-14 | 2019-10-14 | Surface treatment process for large workpiece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970739.8A CN110644008A (en) | 2019-10-14 | 2019-10-14 | Surface treatment process for large workpiece |
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| CN110644008A true CN110644008A (en) | 2020-01-03 |
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| CN201910970739.8A Pending CN110644008A (en) | 2019-10-14 | 2019-10-14 | Surface treatment process for large workpiece |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4694048B2 (en) * | 2001-06-15 | 2011-06-01 | 株式会社パーカーコーポレーション | High-speed descaling method for stainless steel |
| CN106835097A (en) * | 2017-03-10 | 2017-06-13 | 重庆市金思杰科技有限责任公司 | Chrome-free tanning agent and preparation method thereof |
| CN108165971A (en) * | 2017-12-13 | 2018-06-15 | 浙江灿根智能科技有限公司 | The anti-rotten antirust passivation process of copper alloy surface |
-
2019
- 2019-10-14 CN CN201910970739.8A patent/CN110644008A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4694048B2 (en) * | 2001-06-15 | 2011-06-01 | 株式会社パーカーコーポレーション | High-speed descaling method for stainless steel |
| CN106835097A (en) * | 2017-03-10 | 2017-06-13 | 重庆市金思杰科技有限责任公司 | Chrome-free tanning agent and preparation method thereof |
| CN108165971A (en) * | 2017-12-13 | 2018-06-15 | 浙江灿根智能科技有限公司 | The anti-rotten antirust passivation process of copper alloy surface |
Non-Patent Citations (1)
| Title |
|---|
| 樊宝德等: "《油库设备使用与维修》", 31 July 2005, 中国石化出版社 * |
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Application publication date: 20200103 |
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