CN104562051A - Surface treatment method for aluminum alloy casting - Google Patents
Surface treatment method for aluminum alloy casting Download PDFInfo
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- CN104562051A CN104562051A CN201410813374.5A CN201410813374A CN104562051A CN 104562051 A CN104562051 A CN 104562051A CN 201410813374 A CN201410813374 A CN 201410813374A CN 104562051 A CN104562051 A CN 104562051A
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- aluminum alloy
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Abstract
The invention relates to the field of surface treatment of metal, and particularly discloses a surface treatment method for an aluminum alloy casting. The method comprises the following steps: (1), casting pretreatment; (2), copper plating priming; (3), preparation of a TiO thin film; (4), chemical nickel plating; (5) ,electroplating. Compared with the conventional surface treatment method for the aluminum alloy casting, the method has the advantages that the corrosion resistance of the aluminum alloy casting is improved, the deposition rate is greatly increased, and energy resources are further saved under the condition of not excessively increasing the cost.
Description
Technical field
The present invention relates to metallic surface process field, specifically a kind for the treatment of process of aluminum alloy casting surface.
Background technology
The cost of material is low for aluminium alloy, adopts the method for die casting can produce little, the complex-shaped part of tolerance by one-step moulding, be commonly used to replace copper, copper alloy and ferrous materials to manufacture stressed less and structural part that shape is more complicated and decoration.Therefore, aluminum alloy casting is industrially applied widely.
The traditional electroplating technology flow process of aluminum alloy casting is: treatment before plating → copper facing bottoming → plating, and with traditional technique Electroplating Aluminum alloy-steel casting, there will be copper facing rear surface light, without foaming skin effect phenomenon, coating easily bubbles.
The Electroless Plating Ni P of low toxicity, thickness of coating is even, and coating performance is superior, has good erosion resistance, wear resistance and higher hardness, has apply more widely in industries such as petrochemical complex, machinery, electronics.Electroless Plating Ni P is uniform amorphous structure, there is not the defect of crystal boundary, dislocation, fault, and matrix combines fine and close, and erosion resistance is better than electrodeposited chromium.But because its sedimentation rate is slow, coating is thin, surface easily produces the defects such as pin hole.If when coating exists the hole communicated with matrix, corrosive medium oozes people and contacts with matrix metal to coating hole, coating will become the negative electrode of micropore battery, and matrix metal then forms the anode of this battery and causes matrix metal accelerated corrosion.And TiO film is acidproof, alkaline-resisting, anti-light corrosion is excellent corrosion resistant material.
Summary of the invention
In order to solve the deficiency of above-mentioned existing aluminum alloy casting process for treating surface, the invention provides a kind for the treatment of process of aluminum alloy casting surface.
Technical scheme of the present invention is as follows: a kind for the treatment of process of aluminum alloy casting surface, comprises the following steps:
(1) foundry goods pre-treatment: first aluminum alloy casting sand for surface wheel mechanical is eliminated rust, polish flat, then clean up with distilled water, acid activation;
(2) copper facing bottoming: adopt cyanide-free copper electroplating in the bottoming of aluminum alloy casting plated surface one deck copper, plated after washing, acid activation, washing, finally puts into ethanol and soaks 20 ~ 30 minutes by aluminum alloy casting;
(3) preparation of TiO film: mixed with titanium acid butyl ester, concentrated hydrochloric acid and distilled water, mix, vigorous stirring obtains TiO sol solution; Pretreated foundry goods exemplar is taken out, immerses in TiO sol solution, the obtained aluminum alloy casting scribbling TiO film;
(4) chemical nickel plating: the bath pH value of chemical nickel plating is adjusted to 8.0 ~ 9.0, immerses the aluminum alloy casting scribbling TiO film in plating solution and carries out electroless plating process, then washing, acid activation, washing;
(5) electroplate: the aluminum alloy casting scribbling TiO film is carried out follow-up electroplating processes, described follow-up electroplating processes step is the aluminum alloy casting scribbling TiO film is carried out successively acidiccopper plating, vitriol plating semi-gloss nickel, vitriol light-plated pool nickel.
During chemical nickel plating, bath temperature remains on 40 ~ 60 DEG C, and the plating time of chemical nickel plating is 15 ~ 25min.
During copper facing bottoming, current density is 2.5 ~ 3.0 A/dm2, and the electroplating time of copper facing bottoming is 5 ~ 20min.
Acid activation is dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 5% ~ 8%.
The preparation process of described TiO film is carried out in the retort furnace being set to 400 DEG C, and after the preparation process of described TiO colloidal sol, the TiO sol solution of gained is translucent.
Advantage of the present invention: compared with existing aluminum alloy casting surface treatment method, present invention process improves the erosion resistance of aluminum alloy casting, and improves sedimentation rate significantly, when not increasing excessive cost, also a saving the energy.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, the present invention is further elaborated.
Embodiment one:
The treatment process on aluminum alloy casting surface, comprises the following steps:
(1) foundry goods pre-treatment: first aluminum alloy casting sand for surface wheel mechanical is eliminated rust, polish flat, then clean up with distilled water, acid activation;
(2) copper facing bottoming: adopt cyanide-free copper electroplating in the bottoming of aluminum alloy casting plated surface one deck copper, plated after washing, acid activation, washing, finally puts into ethanol and soaks 30 minutes by aluminum alloy casting;
(3) preparation of TiO film: mixed with titanium acid butyl ester, concentrated hydrochloric acid and distilled water, mix, vigorous stirring obtains TiO sol solution; Pretreated foundry goods exemplar is taken out, immerses in TiO sol solution, the obtained aluminum alloy casting scribbling TiO film;
(4) chemical nickel plating: the bath pH value of chemical nickel plating is adjusted to 9.0, immerses the aluminum alloy casting scribbling TiO film in plating solution and carries out electroless plating process, then washing, acid activation, washing;
(5) electroplate: the aluminum alloy casting scribbling TiO film is carried out follow-up electroplating processes, described follow-up electroplating processes step is the aluminum alloy casting scribbling TiO film is carried out successively acidiccopper plating, vitriol plating semi-gloss nickel, vitriol light-plated pool nickel.
During chemical nickel plating, bath temperature remains on 60 DEG C, and the plating time of chemical nickel plating is 20min.
During copper facing bottoming, current density is 3.0 A/dm2, and the electroplating time of copper facing bottoming is 20min.
Acid activation is dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 6%.
The preparation process of described TiO film is carried out in the retort furnace being set to 400 DEG C, and after the preparation process of described TiO colloidal sol, the TiO sol solution of gained is translucent.
Compared with existing aluminum alloy casting surface treatment method, present invention process improves the erosion resistance of aluminum alloy casting, and improves sedimentation rate significantly, when not increasing excessive cost, also a saving the energy.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the treatment process on aluminum alloy casting surface, is characterized in that, comprises the following steps:
(1) foundry goods pre-treatment: first aluminum alloy casting sand for surface wheel mechanical is eliminated rust, polish flat, then clean up with distilled water, acid activation;
(2) copper facing bottoming: adopt cyanide-free copper electroplating in the bottoming of aluminum alloy casting plated surface one deck copper, plated after washing, acid activation, washing, finally puts into ethanol and soaks 20 ~ 30 minutes by aluminum alloy casting;
(3) preparation of TiO film: mixed with titanium acid butyl ester, concentrated hydrochloric acid and distilled water, mix, vigorous stirring obtains TiO sol solution; Pretreated foundry goods exemplar is taken out, immerses in TiO sol solution, the obtained aluminum alloy casting scribbling TiO film;
(4) chemical nickel plating: the bath pH value of chemical nickel plating is adjusted to 8.0 ~ 9.0, immerses the aluminum alloy casting scribbling TiO film in plating solution and carries out electroless plating process, then washing, acid activation, washing;
(5) electroplate: the aluminum alloy casting scribbling TiO film is carried out follow-up electroplating processes, described follow-up electroplating processes step is the aluminum alloy casting scribbling TiO film is carried out successively acidiccopper plating, vitriol plating semi-gloss nickel, vitriol light-plated pool nickel.
2. according to the treatment process on a kind of aluminum alloy casting surface described in claim 1, it is characterized in that, during chemical nickel plating, bath temperature remains on 40 ~ 60 DEG C, and the plating time of chemical nickel plating is 15 ~ 25min.
3. according to the treatment process on a kind of aluminum alloy casting surface described in claim 1, it is characterized in that, during copper facing bottoming, current density is 2.5 ~ 3.0 A/dm2, and the electroplating time of copper facing bottoming is 5 ~ 20min.
4. according to the treatment process on a kind of aluminum alloy casting surface described in claim 1, it is characterized in that, acid activation is dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 5% ~ 8%.
5. according to the treatment process on a kind of aluminum alloy casting surface described in claim 1, it is characterized in that, the preparation process of described TiO film is carried out in the retort furnace being set to 400 DEG C, and after the preparation process of described TiO colloidal sol, the TiO sol solution of gained is translucent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813374.5A CN104562051A (en) | 2014-12-24 | 2014-12-24 | Surface treatment method for aluminum alloy casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813374.5A CN104562051A (en) | 2014-12-24 | 2014-12-24 | Surface treatment method for aluminum alloy casting |
Publications (1)
| Publication Number | Publication Date |
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| CN104562051A true CN104562051A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410813374.5A Pending CN104562051A (en) | 2014-12-24 | 2014-12-24 | Surface treatment method for aluminum alloy casting |
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| CN (1) | CN104562051A (en) |
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2014
- 2014-12-24 CN CN201410813374.5A patent/CN104562051A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 张允诚等: "《电镀手册》", 4 December 2011 * |
| 李志江: "一次锌合金镀件起泡的故障分析", 《电镀与环保》 * |
| 赵亚楠: "TiO2涂层与化学镀Ni-P用于铸件表面处理的研究", 《湖北广播电视大学学报》 * |
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Application publication date: 20150429 |