CN111118562A - Surface treatment process for automobile casting parts - Google Patents
Surface treatment process for automobile casting parts Download PDFInfo
- Publication number
- CN111118562A CN111118562A CN201911326783.1A CN201911326783A CN111118562A CN 111118562 A CN111118562 A CN 111118562A CN 201911326783 A CN201911326783 A CN 201911326783A CN 111118562 A CN111118562 A CN 111118562A
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- CN
- China
- Prior art keywords
- casting
- workpiece
- polishing
- automobile
- surface treatment
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
Abstract
The invention discloses a surface treatment process for an automobile casting, which comprises the following steps: s1: the general surface treatment process of the automobile casting comprises the following steps: automobile aluminum alloy workpiece → precision casting → semi-finished product → polishing and polishing → chemical degreasing → electrolytic degreasing → acid activation → neutral nickel plating → pyrophosphate copper plating → coloring treatment; s2: precision casting, grinding and polishing: the fine casting comprises the processes of molding, plaster molding, wax molding, sand molding, dewaxing, mold baking, casting and the like; the casting surface is rough and has sand holes and scars, and the casting must be polished, wherein the rough surface is firstly polished by filigree filing, and then is polished by cloth abrasive paper. The invention can obtain various colors after surface treatment and coloring treatment, can be comparable to copper artware, has better paint surface adhering effect, has stronger competitiveness in the market, is deeply accepted by the blue of consumers, has less process investment and quick response, and has higher economic benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of automobile casting parts, in particular to a surface treatment process for an automobile casting part.
Background
The application and development of cast parts are important factors in the development of automobiles. On the basis of analyzing the development of automobiles and the current application situation of automobile castings, along with increasingly deep lightweight automobiles, the future development trend of the automobile castings is how much an enterprise needs to meet the development requirements, the automobile castings still have great performance advantages and cost advantages in the future, and great market requirements still exist.
After the existing surface treatment of automobile casting parts is poor, the existing surface treatment can be used for a long time after being coated with paint, the paint surface is unstable, the phenomena of peeling and color change appear endlessly, and in the surface treatment process, a plurality of steps are serious in pollution, the cost is high, and the production is not facilitated.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a surface treatment process for an automobile casting.
The invention provides a surface treatment process for an automobile casting, which comprises the following steps:
s1: the general surface treatment process of the automobile casting comprises the following steps: automobile aluminum alloy workpiece → precision casting → semi-finished product → polishing and polishing → chemical degreasing → electrolytic degreasing → acid activation → neutral nickel plating → pyrophosphate copper plating → coloring treatment;
s2: precision casting, grinding and polishing: the fine casting comprises the processes of molding, plaster molding, wax molding, sand molding, dewaxing, mold baking, casting and the like; the casting surface is rough and has sand holes and scars, and the casting must be polished, wherein the rough surface is firstly polished by filigree filing, and then is polished by cloth abrasive paper.
S3: chemical oil removal: after an automobile aluminum alloy workpiece is ground and polished, polishing scraps are adhered to the surface of the automobile aluminum alloy workpiece, polishing paste is firstly wiped by using fine cloth, then the automobile aluminum alloy workpiece is cleaned by using soft cloth in gasoline, and then the automobile aluminum alloy workpiece is put into chemical degreasing liquid to remove oil;
s4: electrolytic degreasing and acid activation: removing oil in sodium pyrophosphate solution by anode electrolysis, and the concentration of H is 30-50g/L3C6H5O7Performing intermediate activation treatment;
s5: neutral nickel plating and copper plating treatment: after the workpiece is activated, the workpiece does not need to be cleaned, and the workpiece is directly put into a neutral nickel citrate plating tank to cover the surface of the workpiece with a neutral nickel plating layer, and then is subjected to copper plating treatment in a pyrophosphate solution;
s6: and (3) post-plating treatment: and (3) after the plated workpiece is recycled and washed, putting the workpiece into hot distilled water for washing for 1-2min, taking out the workpiece for drying or blow-drying, and spraying corresponding paint surface anti-corrosion treatment on the surface of the workpiece.
Preferably, the polishing wheel in the polishing in S2 should be made of fine cloth or felt, the polishing speed is 1400-.
Preferably, the chemical deoiling liquid in the S3 has the composition of 20-25g/L Na2CO350g/L of Na3PO4And 2g/L of surfactant, wherein the reaction temperature is 60-70 ℃, and the treatment time is 2-3 min.
Preferably, the sodium pyrophosphate solution in S4 is 50-70 g/L of Na4P2O7·10H2O。
Preferably, the thickness of the neutral nickel plating layer in the S5 is 0.5mm-0.8mm, and the thickness of the copper plating layer is 0.3mm-0.8 mm.
The beneficial effects of the invention are as follows:
1. the pre-plated neutral nickel adopted in the surface treatment process is used for treating, the casting alloy casting is generally pre-plated with copper by adopting a neon compound, but the method has the serious problem of environmental pollution, so the process adopts the pre-plated neutral nickel to overcome the defect of the prior process and reduce the pollution;
2. the cast alloy handicraft with the surface treatment process can obtain different colors after being colored after being subjected to surface treatment, can be comparable to copper handicrafts, has good paint surface adhering effect, has strong competitiveness in the market, is deeply subjected to the blue of consumers, has low process investment and quick response, and has high economic benefit and social benefit.
Drawings
FIG. 1 is a processing flow chart of the surface treatment process of the automobile casting part provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, the surface treatment process of the automobile casting comprises the following steps:
s1: the general surface treatment process of the automobile casting comprises the following steps: automobile aluminum alloy workpiece → precision casting → semi-finished product → polishing and polishing → chemical degreasing → electrolytic degreasing → acid activation → neutral nickel plating → pyrophosphate copper plating → coloring treatment;
s2: precision casting, grinding and polishing: the fine casting comprises the processes of molding, plaster molding, wax molding, sand molding, dewaxing, mold baking, casting and the like; the casting surface is rough and has sand holes and scars, and the casting must be polished, wherein the rough surface is firstly polished by filigree filing, and then is polished by cloth abrasive paper.
S3: chemical oil removal: after an automobile aluminum alloy workpiece is ground and polished, polishing scraps are adhered to the surface of the automobile aluminum alloy workpiece, polishing paste is firstly wiped by using fine cloth, then the automobile aluminum alloy workpiece is cleaned by using soft cloth in gasoline, and then the automobile aluminum alloy workpiece is put into chemical degreasing liquid to remove oil;
s4: electrolytic degreasing and acid activation: removing oil in sodium pyrophosphate solution by anode electrolysis, and the concentration of H is 30-50g/L3C6H5O7Medium activationProcessing;
s5: neutral nickel plating and copper plating treatment: after the workpiece is activated, the workpiece does not need to be cleaned, the workpiece is directly put into a neutral nickel citrate plating tank, the surface of the workpiece is covered by a neutral nickel plating layer, then copper plating treatment is carried out in pyrophosphate solution, neutral nickel pre-plating treatment is carried out, casting alloy castings are firstly plated with copper by using neon compounds in advance, but the method has the serious problem of environmental pollution, so that neutral nickel pre-plating is adopted in the process, the defect of the prior process is overcome, and the pollution is reduced;
s6: and (3) post-plating treatment: after being recovered and washed, the plated workpiece is washed in hot distilled water for 1-2min, then taken out and dried or blown to dry, and the surface of the workpiece is sprayed with corresponding paint surface for anticorrosion treatment.
In the invention, the polishing wheel in the polishing in S2 should be fine cloth or felt, the polishing speed is 1400-. The chemical deoiling liquid in S3 contains 20-25g/L of Na2CO350g/L of Na3PO4And 2g/L of surfactant, wherein the reaction temperature is 60-70 ℃, and the treatment time is 2-3 min. The sodium pyrophosphate solution in S4 is 50-70 g/L Na4P2O7·10H2And O. The thickness of the neutral nickel plating layer in the S5 is 0.5mm-0.8mm, and the thickness of the copper plating layer is 0.3mm-0.8 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The surface treatment process of the automobile casting part is characterized by comprising the following steps of:
s1: the general surface treatment process of the automobile casting comprises the following steps: automobile aluminum alloy workpiece → precision casting → semi-finished product → polishing and polishing → chemical degreasing → electrolytic degreasing → acid activation → neutral nickel plating → pyrophosphate copper plating → coloring treatment;
s2: precision casting, grinding and polishing: the fine casting comprises the processes of molding, plaster molding, wax molding, sand molding, dewaxing, mold baking, casting and the like; the casting surface is rough, has sand holes and scars, and must be polished, the rough surface is firstly filed by mixed brocade, and then is polished by cloth abrasive paper;
s3: chemical oil removal: after an automobile aluminum alloy workpiece is ground and polished, polishing scraps are adhered to the surface of the automobile aluminum alloy workpiece, polishing paste is firstly wiped by using fine cloth, then the automobile aluminum alloy workpiece is cleaned by using soft cloth in gasoline, and then the automobile aluminum alloy workpiece is put into chemical degreasing liquid to remove oil;
s4: electrolytic degreasing and acid activation: removing oil in sodium pyrophosphate solution by anode electrolysis, and the concentration of H is 30-50g/L3C6H5O7Performing intermediate activation treatment;
s5: neutral nickel plating and copper plating treatment: after the workpiece is activated, the workpiece does not need to be cleaned, and the workpiece is directly put into a neutral nickel citrate plating tank to cover the surface of the workpiece with a neutral nickel plating layer, and then is subjected to copper plating treatment in a pyrophosphate solution;
s6: and (3) post-plating treatment: and (3) after the plated workpiece is recycled and washed, putting the workpiece into hot distilled water for washing for 1-2min, taking out the workpiece for drying or blow-drying, and spraying corresponding paint surface anti-corrosion treatment on the surface of the workpiece.
2. The surface treatment process for the cast parts of automobiles as claimed in claim 1, wherein the polishing wheel in the polishing in S2 is selected from fine cloth or felt, the polishing speed is 1400-1800r/min, and the polishing wheel diameter is 250-300 mm.
3. The surface treatment process of claim 1, wherein the chemical degreasing liquid in the S3 contains 20-25g/L of Na2CO350g/L of Na3PO4And 2g/L of surfactant, wherein the reaction temperature is 60-70 ℃, and the treatment time is 2-3 min.
4. The surface treatment process of the automobile casting parts as claimed in claim 1, wherein the sodium pyrophosphate solution in the S4 is 50-70 g/L of Na4P2O7·10H2O。
5. The surface treatment process for automobile castings according to claim 1, wherein the neutral nickel plating layer in S5 has a thickness of 0.5mm to 0.8mm, and the copper plating layer has a thickness of 0.3mm to 0.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326783.1A CN111118562A (en) | 2019-12-20 | 2019-12-20 | Surface treatment process for automobile casting parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326783.1A CN111118562A (en) | 2019-12-20 | 2019-12-20 | Surface treatment process for automobile casting parts |
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| Publication Number | Publication Date |
|---|---|
| CN111118562A true CN111118562A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911326783.1A Pending CN111118562A (en) | 2019-12-20 | 2019-12-20 | Surface treatment process for automobile casting parts |
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| CN (1) | CN111118562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115739554A (en) * | 2022-11-30 | 2023-03-07 | 江苏威晟新材料科技有限公司 | Surface treatment process for casting part |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498288A (en) * | 2000-08-17 | 2004-05-19 | ��������ķ������ | ELectroplated aluminium parts and process of production thereof |
-
2019
- 2019-12-20 CN CN201911326783.1A patent/CN111118562A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498288A (en) * | 2000-08-17 | 2004-05-19 | ��������ķ������ | ELectroplated aluminium parts and process of production thereof |
Non-Patent Citations (2)
| Title |
|---|
| 原顺德 等: "铝合金铸件电镀", 《电镀与环保》 * |
| 罗耀宗: "铝合金电镀前处理新工艺", 《电镀与涂刷》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115739554A (en) * | 2022-11-30 | 2023-03-07 | 江苏威晟新材料科技有限公司 | Surface treatment process for casting part |
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Application publication date: 20200508 |