Flux for use in soldering of stainless steels

Claim 3

The method of claim 11 which includes incorporating with said ingredients from about 2 to 25 parts by weight of a nonionic surfactant. ( 13. In the soldering of stainless steel in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 1.) ( 14. In the soldering of stainless steel in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 4.) ( 15. In the soldering of stainless steel in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 6.) ( 16. In the soldering of stainless steel in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 9.)

Claim 4

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphorus acid, to which has been added from 5 to 20%, by weight of said acid, of a copper salt selected from the group consisting of copper acetate, basic copper carbonate, cupric carbonate, cuprous carbonate, basic cupric chromate, cupric dichromate, copper oxides, copper hydroxides, copper salicylate, cupric phosphite, cupric phosphate, and copper salt complexes with ammonia or amines, said flux being essentially free from halides.

Claim 5

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphorus acid, to which has been added from 5 to 20%, by weight of said acid, of a copper salt selected from the group consisting of copper acetate, basic copper carbonate, cupric carbonate, cuprous carbonate, basic cupric chromate, cupric dichromate, copper oxides, copper hydroxides, copper salicylate, cupric phosphite, cupric phosphate, and copper salt complexes with ammonia or amines, said flux being essentially free from halides.

Claim 6

The flux of claim 17 in which the added copper compound constitutes from about 5 to about 10% by weight of said acid.

Claim 7

The flux of claim 18 in the added copper compound is basic copper carbonate.

Claim 8

The flux of claim 18 in which the added copper compound is a copper phosphate.

Claim 9

The flux of claim 17 in which the phosphorus-containing acid comprises 75-105% orthophosphoric acid.

Claim 10

The flux of claim 17 wherein the following ingredients are present in approximately the stated parts by weight:

Claim 11

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphoric acid, to which has been added from 4 to 10%, by weight of said acid, of metallic copper, said flux being essentially free from halides.

Claim 12

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphoric acid, to which has been added from 4 to 10%, by weight of said acid, of metallic copper, said flux being essentially free from halides.

Claim 13

The flux of claim 23 in which the phosphorus-containing acid comprises 75-105% orthophosphoric acid.

Claim 14

A flux for use in soldering stainless steels which comprises, as essential ingredients, a 40-115% orthophosphoric acid to which has been added finely divided copper, the aforesaid ingredients being admixed in proportions, per 100 parts of said orthophosphoric acid, of from 5 to 10 parts of said finely divided copper, said parts being by weight, and the resulting flux being essentially free of halides.

Claim 15

A flux for use in soldering stainless steels which comprises, as essential ingredients, a 40-115% orthophosphoric acid to which has been added finely divided copper, the aforesaid ingredients being admixed in proportions, per 100 parts of said orthophosphoric acid, of from 5 to 10 parts of said finely divided copper, said parts being by weight, and the resulting flux being essentially free of halides.

Claim 16

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of 75-105% orthophosphoric acid and a copper phosphate, the copper phosphate constituting from about 5 to 15% by weight of the orthophosphoric acid, said flux being essentially free of halides.

Claim 17

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of 75-105% orthophosphoric acid and a copper phosphate, the copper phosphate constituting from about 5 to 15% by weight of the orthophosphoric acid, said flux being essentially free of halides.

Claim 18

The flux of claim 26 which includes an ammonium phosphate.

Claim 19

The flux of claim 26 which includes a minor proportion of a nonionic surfactant.

Claim 20

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of 75-105% orthophosphoric acid, and a minor proportion of a complex copper-ammonium salt, said flux being essentially free of halides.

Claim 21

A flux for use in soldering stainless steels which comprises, as essential ingredients, a major proportion of 75-105% orthophosphoric acid, and a minor proportion of a complex copper-ammonium salt, said flux being essentially free of halides.

Claim 22

A flux for use in soldering stainless steels which comprises, as essential ingredients, a 75-115% orthophosphoric acid and a non-halide copper salt, the aforesaid ingredients being present in proportions, per 100 parts of said acid, of from 5 to 20 parts of said non-halide copper salt, said parts being by weight, said flux being essentially free of halides.

Claim 23

A flux for use in soldering stainless steels which comprises, as essential ingredients, a 75-115% orthophosphoric acid and a non-halide copper salt, the aforesaid ingredients being present in proportions, per 100 parts of said acid, of from 5 to 20 parts of said non-halide copper salt, said parts being by weight, said flux being essentially free of halides.

Claim 24

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 17.

Claim 25

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 20.

Claim 26

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 22.

Claim 27

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 23.

Claim 28

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux the flux of claim 30.

Claim 29

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux a flux which comprises as essential ingredients, a 75-115% orthophosphoric acid and a non-halide copper salt, the aforesaid ingredients being present in proportions, per 100 parts of said acid, of from 1 to 20 parts of said non-halide copper salt, said parts being by weight, said flux being essentially free of halides.

Claim 30

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux a flux which comprises as essential ingredients, a 75-115% orthophosphoric acid and a non-halide copper salt, the aforesaid ingredients being present in proportions, per 100 parts of said acid, of from 1 to 20 parts of said non-halide copper salt, said parts being by weight, said flux being essentially free of halides.

Claim 31

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux a flux which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphorus acid, to which has been added from 1 to 10%, by weight of said acid, of metallic copper, said flux being essentially free from halides.

Claim 32

In the soldering of stainless steels in which a soldering flux is utilized, the improvement which comprises utilizing as said flux a flux which comprises, as essential ingredients, a major proportion of at least one phosphorus-containing acid selected from the group of orthophosphoric acid and phosphorus acid, to which has been added from 1 to 10%, by weight of said acid, of metallic copper, said flux being essentially free from halides.