CN105215568B - A kind of tin solder of resistance to marine climate and preparation method thereof - Google Patents

Abstract

The invention discloses a marine climate-resistant tin-based solder, which comprises Al with a weight percentage of 0.005-0.20%, Ni with a weight percentage of 0.005-0.20%, Cr with a weight percentage of 0.005-0.20%, and The percentage content is 0.005-0.20% of Sb; it also includes 37% by weight of Pb or 40% by weight of Bi or 0.7% by weight of Cu; the balance is Sn. The invention also discloses a preparation method of the above-mentioned marine climate-resistant tin-based solder. The marine-resistant tin-based solder of the present invention can effectively improve the performance of the tin-based solder in terms of chloride ion corrosion resistance, oxidation resistance and damp heat mildew resistance by adding trace elements Al, Ni, Cr and Sb in the solder matrix, thereby reducing the The tin-based solder has the problem of surface corrosion, discoloration, mildew or desoldering.

Description

A kind of marine climate-resistant tin-based solder and its preparation method

technical field

The invention relates to a tin-based solder resistant to marine climate, and also relates to a preparation method of the tin-based solder, which belongs to the field of tin solder alloys.

Background technique

With the development of modern technology and the improvement of human living standards, more and more electrical and electronic equipment needs to be used in coastal and offshore environments. Corrosion of solder by high-temperature, high-humidity, salt-containing marine atmospheres will affect related equipment reliability. In recent years, a large number of photovoltaic power generation devices have been placed in coastal tidal flats or near-shore front seas. The threat of solar panels being eroded by chloride ions is increasing. The probability of surface corrosion, discoloration, mildew, and desoldering of solder is greatly increased. The operating life of the components is adversely affected. Therefore, the industry has a strong interest in developing new solders resistant to marine climates, and research has also shown an increasing trend in recent years. Therefore, the development of a tin-based solder resistant to marine climate is necessary.

Contents of the invention

Purpose of the invention: The technical problem to be solved by the present invention is to provide a tin-based solder resistant to marine climate, which can be used for soldering of electronic devices that need to be used in a marine atmosphere.

The technical problem to be solved by the present invention is to provide the preparation method of the above-mentioned tin-based solder resistant to marine climate.

Summary of the invention: In order to solve the above technical problems, the technical solution adopted in the present invention is:

A tin-based solder resistant to marine climate, comprising 0.005-0.20% by weight of Al, 0.005-0.20% by weight of Ni, 0.005-0.20% by weight of Cr and 0.005% by weight -0.20% Sb; also includes 37% by weight of Pb or 40% by weight of Bi or 0.7% by weight of Cu; the balance is Sn.

Wherein, the sum of the weight percent contents of Al, Ni, Cr and Sb elements is less than or equal to 0.25%.

The preparation method of the above-mentioned marine climate-resistant tin-based solder includes the following steps: melting a required amount of pure tin in a crucible furnace, raising the temperature to 600-700°C and adding a required amount of Sn-3% into the crucible furnace Cr intermediate alloy, after melting, cool down to 200-300°C, then add required Cu elements, Bi elements, Pb elements, and Ni, Sb and Al elements into the crucible furnace, and cast into ingots after the materials in the crucible furnace are completely melted That's it.

Beneficial effects: the marine-resistant tin-based solder of the present invention can effectively improve the performance of the tin-based solder in terms of resistance to chloride ion erosion, oxidation resistance and damp-heat mildew resistance by adding trace elements Al, Ni, Cr and Sb to the solder matrix, Therefore, the problems of surface corrosion, discoloration, mildew or desoldering of the tin-based solder are reduced, thereby significantly improving the service life and reliability of electronic equipment in marine atmospheres.

The tin-based solder of the present invention can form an oxide layer that effectively blocks chloride ions on the surface of the solder matrix by adding Ni and Cr elements in the solder matrix, thus improving the salt spray (chloride ion) corrosion resistance of the alloy, and the Ni element can also A nickel-rich ion layer is formed on the surface of the solder matrix, so that the solder has mildew resistance. The tin-based solder of the present invention can form a dense oxide film layer on the surface of the solder matrix by adding Al and Sb elements in the solder matrix, thereby slowing down the soldering process. oxidation, maintain the integrity of the surface structure, and improve the oxidation resistance of the solder.

detailed description

The present invention can be better understood from the following examples. However, those skilled in the art can easily understand that the content described in the embodiments is only for illustrating the present invention, and should not and will not limit the present invention described in the claims.

Example 1

A tin-based solder resistant to marine climate is composed of the following components in weight percentage: 0.7% Cu, 0.005% Al, 0.005% Sb, 0.1% Cr, 0.1% Ni, and the balance is Sn.

The above-mentioned tin-based solder resistant to marine climate is prepared by the following method: first melt the required amount of pure tin in the crucible furnace during melting, then raise the temperature to 600°C, and then add the required amount of Sn into the crucible furnace -3% Cr master alloy (prepared in advance), after melting, cool down to 300°C, then add required Cu, Ni, Sb and Al elements into the crucible furnace, and cast it after the materials in the crucible furnace are completely melted and evenly Ingots are enough.

Example 2

A tin-based solder resistant to marine climate is composed of the following components in weight percent: 37% Pb, 0.05% Al, 0.05% Sb, 0.05% Cr, 0.05% Ni, and the balance is Sn.

The above-mentioned tin-based solder resistant to marine climate is prepared by the following method: first melt the required amount of pure tin in the crucible furnace during melting, then raise the temperature to 600°C, and then add the required amount of Sn into the crucible furnace -3% Cr master alloy (prepared in advance), after melting, cool down to 280°C, then add the required Pb, Ni, Sb and Al elements into the crucible furnace, and cast it after the materials in the crucible furnace are completely melted and uniform. Ingots are enough.

Example 3

A tin-based solder resistant to marine climate is composed of the following components by weight percentage: 40% Bi, 0.1% Al, 0.05% Sb, 0.05% Cr, 0.005% Ni, and the balance is Sn.

The above-mentioned tin-based solder resistant to marine climate is prepared by the following method: first melt the required amount of pure tin in the crucible furnace during melting, then raise the temperature to 600°C, and then add the required amount of Sn into the crucible furnace -3% Cr master alloy (prepared in advance), after melting, cool down to 280°C, then add the required Bi elements, Ni, Sb and Al elements into the crucible furnace, and cast after the materials in the crucible furnace are completely melted and uniform It can be made into ingots.

Example 4

A tin-based solder resistant to marine climate is composed of the following components by weight percentage: 0.7% Cu, 0.2% Al, 0.005% Sb, 0.005% Cr, 0.005% Ni, and the balance is Sn.

The above-mentioned tin-based solder resistant to marine climate is prepared by the following method: first melt the required amount of pure tin in the crucible furnace during melting, then raise the temperature to 700°C, and then add the required amount of Sn into the crucible furnace -3% Cr master alloy (prepared in advance), after melting, cool down to 200°C, then add the required Cu elements, Ni, Sb and Al elements into the crucible furnace, and cast after the materials in the crucible furnace are completely melted and uniform It can be made into ingots.

The tin-base solder that embodiment 1～4 makes and Sn-40%Bi and Sn-0.7%Cu carry out wet heat test, salt spray test and hydrochloric acid acceleration test respectively under the same test condition, and the conditions of various tests are as shown in the table 1, the test results are shown in Table 2;

Table 1 Test conditions for damp heat and corrosion:

Table 2 shows the damp heat and corrosion test results of various tin-based solders:

As can be seen from Table 2, compared with the existing tin-based solder, the tin-based solder of the present invention has obvious improvement in heat and humidity resistance and corrosion resistance after adding Al, Ni, Cr and Sb elements , and then solve the problem that tin-based solder is easy to corrode in high-temperature, high-humidity and salt-containing marine atmosphere.

Claims (2)

1. A tin-based solder resistant to marine climate, characterized in that: comprising 0.005-0.20% Al by weight, 0.005-0.20% Ni by 0.005-0.20% by weight, and 0.005-0.20% Cr by weight and Sb with a content of 0.005 to 0.20% by weight; it also includes Pb with a content of 37% by weight or Bi with a content of 40% by weight or Cu with a content of 0.7% by weight; the balance is Sn; the Al, The sum of the weight percent contents of Ni, Cr and Sb elements is less than or equal to 0.25%. 2. A method for preparing the marine climate-resistant tin-based solder according to claim 1, characterized in that: comprising the following steps: melting the required amount of pure tin in a crucible furnace, and raising the temperature to 600-700°C Add the required amount of Sn-3%Cr intermediate alloy into the crucible furnace, cool down to 200-300°C after melting, and then add the required Cu element or Bi element or Pb element and Ni, Sb and Al into the crucible furnace Elements can be cast into ingots after the materials in the crucible furnace are completely melted.