Abstract This invention relates to the corrosion protection of cupriferous surfaces. According to the invention, effective corrosion protection is obtained by treating the copper surfaces with a solution of elementary sulfur in certain organic solvents viz. in organic amines of the group comprising alkyl amines, aryl amines, hydroxyalkyl amines, and hydroxyaryl amines. Before use, these solutions are diluted with water, preferably in a ratio of approximately 1:500. It is believed that by this treatment a copper sulfide layer is formed on the treated surfaces, with simultaneous inclusion of sulfur into the copper lattice near the surface. While the surface layer of copper sulfide has but poor mechanical resistance, the layer containing included sulfur is firmly adherent and gives an effective protection of the copper articles.
A METHOD FOR PROTECTING COPPER SURFACES AGAINST CORROSION, COMPRISING TREATING THE SURFACES TO BE PROTECTED WITH A SOLUTION OF ELEMENTARY SULFUR IN THE PROPORTION OF 15 TO 20% BY WEIGHT IN A HYDROXYALKYL AMINE, SAID SOLUTION BEING DILUTED WITH H2O IN THE RATIO OF 1:100 TO 1:1000 BEFORE APPLICATION.
Claim 2
Independent Claim
49 words
A METHOD FOR PROTECTING COPPER SURFACES AGAINST CORROSION, COMPRISING TREATING THE SURFACES TO BE PROTECTED WITH A SOLUTION OF ELEMENTARY SULFUR IN THE PROPORTION OF 15 TO 20% BY WEIGHT IN A HYDROXYALKYL AMINE, SAID SOLUTION BEING DILUTED WITH H2O IN THE RATIO OF 1:100 TO 1:1000 BEFORE APPLICATION.
Claim 3
Independent Claim
34 words
A method for protecting copper surfaces against corrosion, comprising treating the copper surfaces with a 20% by weight solution of elementary sulfur in monoethanolamine which is diluted with water in the ratio of 1:500.
Claim 4
Independent Claim
34 words
A method for protecting copper surfaces against corrosion, comprising treating the copper surfaces with a 20% by weight solution of elementary sulfur in monoethanolamine which is diluted with water in the ratio of 1:500.
Claim 5
Independent Claim
34 words
A method for protecting copper surfaces against corrosion, comprising treating the copper surfaces with a 15% by weight solution of elementary sulfur in isopropanolamine which is diluted with water in the ratio of 1:500.
Claim 6
Independent Claim
34 words
A method for protecting copper surfaces against corrosion, comprising treating the copper surfaces with a 15% by weight solution of elementary sulfur in isopropanolamine which is diluted with water in the ratio of 1:500.