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Industrial pure tin with resistance to liquid surface oxidizing and application

A surface oxidation, industrially pure technology, used in manufacturing tools, metal processing equipment, welding media, etc., can solve the problems of inclusion pollution, micro-welding, and poor welding in solder pools, and achieve the effect of improving oxidation resistance.

Inactive Publication Date: 2005-12-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process produces tin slag very quickly. A common wave soldering machine can lose as much as several kilograms of tin every day due to oxidized tin slag. These surface scums not only lose a large amount of solder, but also cause solder pool damage. Inclusion pollution requires continuous manual slag removal to make the wave soldering machine operate normally. Otherwise, the tin slag floating or deposited in the solder pool is easy to adhere to the solder joints, resulting in poor welding , micro-soldering and other welding defects, therefore, how to reduce the oxidation of the solder surface in the molten state is the key technology to be solved in the wave soldering process and one of the main technical ways to reduce production costs

Method used

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  • Industrial pure tin with resistance to liquid surface oxidizing and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of anti-liquid surface tin oxide is prepared by using industrial No. 1 tin as a raw material and adding trace element 0.05% Ge (weight percentage, the same below). Take 100g of the sample and place it in a graphite crucible with a diameter of 20mm for heating and melting, and heat it up to 250°C for heat preservation. After gently scraping off a layer of film on the surface with a scraper, observe the oxidation on the surface of the liquid metal melt. Just after scraping off the surface film, the metal liquid surface is very bright. The degree of oxidation resistance of the metal liquid surface can be easily estimated from the brightness of the metal liquid surface, because once the oxide film is formed, this bright liquid surface will quickly disappear. Through observation, it can be found that the tin added with the above trace elements is heated and kept warm for a long time in the atmosphere, and the surface of the molten tin can still remain bright. After 5 ...

Embodiment 2

[0018] The composition of the prepared sample is 0.03% P, and the rest is industrial pure tin. The test method and procedure are the same as those in Example 1. When kept at 250°C, the molten liquid surface remained bright for a long time. After 5 hours of oxidation, the center of the liquid surface was still bright, and there was a thin oxide film on the edge surface, and there was no further change in color. Therefore, the sample has good oxidation resistance. .

Embodiment 3

[0020] The components of the prepared sample are 0.05% Sb, 0.02% Ge, and the rest are industrial pure tin. The test method and procedure are the same as those in Example 1. When kept at 250°C, the molten liquid surface remained bright for a long time. After 5 hours of oxidation, the center of the liquid surface was still bright, and there was a thin oxide film on the edge surface, and there was no further change in color. Therefore, the sample has good oxidation resistance. .

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Abstract

The present invention provides one kind of industrial pure tin resisting liquid surface oxidation. One or several of trace elements Sb, Ag, Zn, P and Ge in the amount of 0.01-0.2 wt% is added into tin so as to raise the oxidation resistance of liquid metal surface in atmosphere condition. This kind of industrial pure tin may be used as material for producing various pure tin products or tin-base alloy, and is especially suitable for preparing various tin-base electronic soldering alloy requiring high liquid metal surface oxidation resisting performance.

Description

Technical field: [0001] The present invention relates to an industrial pure tin raw material, and specifically provides an industrial pure tin resistant to liquid surface oxidation. The industrial pure tin can be used as a raw material for preparing various pure Sn products or tin-based alloys, especially It is suitable for the preparation of tin-based electronic solder alloys to improve the oxidation resistance of their liquid surfaces. Background technique: [0002] Tin is a metal with a wide range of uses, among which tin-based alloys are mainly used for the preparation of solder and bearing materials. In recent years, due to the rapid development of the electronics industry, the proportion of tin used in electronic solders is rising rapidly. At the same time, after nearly 30 years of continuous technological progress in modern microelectronic packaging technology, some new soldering technologies have been established and developed to meet the production needs of simultan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/26C22C13/00
Inventor 冼爱平郭建军尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI