Flux composition and brazing sheet

A technology of flux and composition, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of rising cost, expensive Cs, low practicability, etc., and achieve high strength, light weight, wettability Improves and improves the effect of brazing

Inactive Publication Date: 2013-03-06
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the flux composition to which CsF in the above (1) is added is not suitable for mass production, etc., because Cs is very expensive, and its practicability is low.
On the other hand, according to CaF added with the above (2) 2 It is considered that the flux composition such as , etc. lowers the melting point of the flux and improves the wettability of the flux, but the wettability of the flux changes according to the coating amount. However, in the above-mentioned publications, However, there is no description of the research on the coating amount of flux
Therefore using the addition of CaF 2 In the case of a flux composition such as , the coating amount is increased in order to exhibit sufficient wettability, which may lead to an increase in cost

Method used

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  • Flux composition and brazing sheet
  • Flux composition and brazing sheet
  • Flux composition and brazing sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Mix KF and AlF at a mass ratio of 1:1 3 , to obtain [A] flux composition. Add 20 parts by mass of BaF as [B] additive with respect to 100 parts by mass of this [A] flux composition 2 and mixed to obtain the flux composition of Example 1.

Embodiment 2～11

[0073] Except having set [B] additive to the kind and content (parts by mass) shown in Table 1, it prepared similarly to Example 1, and obtained the flux composition of Examples 2-11.

[0074] 〔Evaluation〕

[0075] In 100 mL of ion-exchanged water, 0.04 g of each obtained flux composition was prepared and suspended to obtain a suspension containing the flux composition. The above-mentioned suspension was dropped on the center of a plate-shaped Al-Mg alloy (Mg content: 0.6% by mass) with a diameter of 20 mm so that the flux composition had a diameter of 5 mm, and dried. In addition, the mass of the plate alloy is measured before and after the flux composition is attached, and the dropping amount is adjusted so that the amount of the flux composition attached (solid content) becomes 1 to 10 g / m 2 . Thereafter, the plate-shaped alloy to which the flux composition was adhered was heated at 600° C. for 10 minutes in an atmosphere having a dew point of −40° C. and an oxygen concen...

Embodiment 12

[0083] Use 30 parts by mass of BaF as [B] additive 2 , except that, the same adjustment as in Example 1 was performed to obtain the flux composition of Example 12. Using the flux composition obtained in Example 12, the plate-shaped alloy was heated in the same manner as the evaluation method described above, and after cooling, the surface was observed with a scanning electron microscope (SEM). The observed image is shown in figure 2 middle. In addition, the observed image of the surface of the plate-shaped alloy after heating when the flux composition containing only the [A] flux component of Comparative Example 1 is used is shown in image 3 middle.

[0084] Depend on figure 2 As can be seen from the photographs in the figure, when the flux composition obtained in Example 12 was used, precipitation of needle-shaped high melting point compounds was hardly observed. On the other hand, if image 3 As shown in the photo, when the flux composition of Comparative Example 1 ...

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Abstract

Disclosed are: a flux composition which is used for brazing of a magnesium-containing aluminum alloy material, suppresses the formation of high-melting compounds, provides better wettability, and thereby exhibits better brazability even applied in a small mass of coating; and a brazing sheet using the flux composition. The flux composition for brazing of a magnesium-containing aluminum alloy material includes a flux component [A] containing fluorides as principal components; and an additive [B] being at least one selected from the group consisting of CeF3, BaF2, and ZnSO4. The flux component [A] preferably contains KF in a content of 40 percent by mass or more and 60 percent by mass or less; and AlF3 in a content of 40 percent by mass or more and 60 percent by mass or less.

Description

technical field [0001] The present invention relates to a flux composition used for brazing magnesium-containing aluminum alloy materials and a brazing sheet using the flux composition. Background technique [0002] In recent years, attention has been paid to environmental issues. For example, in the automotive industry, weight reduction for the purpose of improving fuel efficiency is also being promoted. In response to the demand for weight reduction, researches on reducing the thickness and increasing the strength of the aluminum cladding material (brazing sheet) for automobile heat exchangers are active. The above-mentioned brazing sheet generally has a three-layer structure composed of a sacrificial material (for example, Al-Zn system), a core material (for example, Al-Si-Mn-Cu system), and a brazing material (for example, Al-Si system), In order to achieve high strength, magnesium (Mg) is added to the above-mentioned core material, that is, by means of Mg 2 Research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B32B15/04
CPCB23K35/3605B23K35/362B23K35/0233B23K35/284B32B15/04F28F21/089Y10T428/31678
Inventor 小林宣裕堀口元宏国井一孝植田利树木村申平
Owner KOBE STEEL LTD
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