Electrolytic phosphating treatment method and warm or hot forging method

A treatment method, a technique for electrolytic phosphating, applied in the direction of phosphating, etc., capable of solving problems such as the possibility of not teaching or suggesting warm forging or hot forging applications, etc.

Inactive Publication Date: 2008-01-16
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

JP-A-200-234200 describes the film to be applied to cold forging, but does not teach or suggest the possibility of application for warm or hot forging

Method used

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  • Electrolytic phosphating treatment method and warm or hot forging method
  • Electrolytic phosphating treatment method and warm or hot forging method
  • Electrolytic phosphating treatment method and warm or hot forging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0181] (I. Improvement of electrolytic phosphating treatment efficiency)

[0182] Table 4 shows the treatment liquid conditions in Examples 1-5 and Comparative Example 1.

[0183] Table 4

[0184]

[0185] In the comparative example, the concentrations of phosphoric acid and phosphate ions were higher than 1 / 2 of metal ions (Ni). In this case, the treatment liquid is out of the scope of the treatment liquid of the present invention.

[0186] The electrolytic phosphating treatment was carried out in these treatment solutions, and Table 5 shows the outline.

[0187] table 5

[0188] Trial Products / Test Conditions

[0189] Incidentally, the film thickness was measured by using an electromagnetic film thickness tester (LE-300J, K.K. Ketto Kagaku Kenkyujo).

Embodiment 6-8

[0216] (II. Application in warm forging)

[0217] Automobile engine parts (lower body: material SCM415) are used. Figure 9 shows the situation before warm forging, and Figure 10 shows the situation before and after warm forging.

[0218] Table 9 shows the warm forging process steps in Examples 6-8 and Comparative Example 2. However, water washing and hot water washing are omitted. In warm forging pressing, a solid lubricant (graphite) was sprayed onto a die in Examples 6-8 and Comparative Example 2 under the same conditions.

[0219] Table 9

[0220] steps

Example 6

Example 7

Example 8

Comparative example 2

previous steps

Cold-rolled film with phosphating treatment + lubricant (stearin) formed by lubricating treatment

salt) coil

1

Sandblasting

o

o

o

-(0)

2

skim

o

o

o

-(0)

3

electrolytic phosphating formation site

Reason: Metal + Phosphate

o

o

...

Embodiment 9

[0247] (organic fatty acid salt is used for the embodiment of lubricant)

[0248] Use automotive engine parts (NB cylinder: material SUJ2: Cr-containing alloy steel). Figures 15 and 16 show the shapes of the NB cylinders before and after warm forging, respectively.

[0249] Table 13 shows the warm forging steps of Example 9 and Comparative Example 5.

[0250] Incidentally, the lubricant was sprayed onto the dies under the same conditions in the warm forging of Example 9 and Comparative Example 5.

[0251] Table 13

[0252] steps

Example 9

Comparative example 5

1

Sandblasting

o

-(0)

2

skim

o

-(0)

3

surface adjustment

o

-(0)

4

Electrolytic Phosphating: Metal

+ phosphate

o

-(0)

5

Lubrication treatment

o: sodium stearate, 3-6%: dissolved at 85°C

liquid, 3 minutes

-(0)

6

Heating: 850°C

o

o

7

warm forging

o

...

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PUM

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Abstract

The invention provides an electrolytic phosphating treatment method that forms a film by causing a large current to flow at a voltage as low as possible and can improve efficiency. Namely, the invention provides an electrolytic phosphating treatment method for forming a film containing a metal precipitating from a nitrate, and a phosphate, by executing electrolysis between a metal that is the same as a metal of a nitrate of a treatment bath as an electrode and a work by using a D.C. power source, the treatment bath comprising phosphoric acid, zinc, iron or manganese as a metal capable of dissociating phosphoric acid and dissolving in phosphoric acid, and a solution dissolving a nitrate of a metal to become a film component, wherein anions other than nitrate ions and metal ions other than the metal ions to become the film component are present at not greater than 0.5 g / L, the metal ion dissolving from the nitrate is present at greater than 10 g / L and phosphoric acid and phosphate ion are present at not greater than 1 / 2 of the metal ion dissolving from the nitrate.

Description

technical field [0001] The present invention relates to a treatment solution for forming a thin film containing phosphate and metal on a metal surface by electrolytic treatment, a method for this treatment, and a method for plastic working of a workpiece heated to a high temperature and above warm or hot forging temperature Lubrication treatment. Background technique [0002] Japanese Unexamined Patent Publication (Kokai) No. 2000-234200 (JP-A-2000-234200) is a basic patent application related to electrolytic phosphating treatment, filed by the present inventors. This patent application is characterized in that the treatment liquid contains substantially no metal ions (less than 0.4 g / L) other than film-forming components. The composition of the treatment solution is characterized by containing 6-140g / L nitrate ions, 0.5-60g / L phosphoric acid and phosphate ions, and 0.5-70g / L ions that form complexes with phosphate ions in the treatment solution and are dissolved therein (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/36B21J3/00
CPCC25D11/36B21J3/00
Inventor 松田茂树
Owner DENSO CORP
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