Optimized passivation on Ti/Zr-basis for metal surfaces
First Claim
1. An aqueous chromium-free agent for anticorrosion conversion treatment of metallic surfaces comprising components:
- (A) one or more water-soluble compounds containing at least one atom selected from elements titanium and/or zirconium, total concentration of said elements being no less than 2.5·
10−
4 mol/l, but no greater than 2.0·
10−
2 mol/l;
(B) one or more water-soluble compounds, as a source of fluoride ions, containing at least one fluorine atom;
the agent containing the elements of (A) and the fluorine of (B) in a molar ratio A;
B of 1;
z, z being a real number and greater than 6;
(C) one or more water-soluble compounds, which release copper ions, containing at least one copper atom; and
(D) one or more water-soluble and/or water-dispersible compounds, which release metal ions, but are not a source of fluoride ions, containing at least one metal atom selected from the group consisting of aluminum and iron; and
optionally further containing calcium;
said agent having a molar ratio D;
B representing total number of component (D) metal atoms to total number of component (B) fluorine atoms, D;
B;
being no less than
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Accused Products
Abstract
The present invention relates to a chromium-free aqueous agent based on water-soluble compounds of titanium and/or zirconium and a source of fluoride ions, copper ions and metal ions selected from the group consisting of calcium, magnesium, aluminum, boron, zinc, iron, manganese and/or tungstene and to a method for the anti-corrosive conversion treatment of metal surfaces. The chromium-free aqueous agent is suitable for the treatment of various metal materials, joined in composite structures, amongst others of steel or galvanized steel or the alloys thereof or any combinations of said materials. Furthermore, surfaces of aluminum and alloys thereof can be treated in an anti-corrosive manner using the agent according to the invention. The anti-corrosive treatment is intended in particular as a pretreatment for a subsequent dip-coating. The invention further relates to a metallic substrate that was treated according to a predefined method sequence with the chromium-free agent according to the invention and to the use thereof, particularly in the automotive production of vehicle bodies.
16 Citations
12 Claims
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1. An aqueous chromium-free agent for anticorrosion conversion treatment of metallic surfaces comprising components:
-
(A) one or more water-soluble compounds containing at least one atom selected from elements titanium and/or zirconium, total concentration of said elements being no less than 2.5·
10−
4 mol/l, but no greater than 2.0·
10−
2 mol/l;(B) one or more water-soluble compounds, as a source of fluoride ions, containing at least one fluorine atom; the agent containing the elements of (A) and the fluorine of (B) in a molar ratio A;
B of 1;
z, z being a real number and greater than 6;(C) one or more water-soluble compounds, which release copper ions, containing at least one copper atom; and (D) one or more water-soluble and/or water-dispersible compounds, which release metal ions, but are not a source of fluoride ions, containing at least one metal atom selected from the group consisting of aluminum and iron; and
optionally further containing calcium;said agent having a molar ratio D;
B representing total number of component (D) metal atoms to total number of component (B) fluorine atoms, D;
B;being no less than - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An aqueous chromium-free agent for anticorrosion conversion treatment of metallic surfaces comprising components:
-
(A) one or more water-soluble compounds containing at least one atom selected from elements titanium and/or zirconium, total concentration of said elements being no less than 2.5·
10−
4 mol/l, but no greater than 2.0·
10−
2 mol/l;(B) one or more water-soluble compounds, as a source of fluoride ions, containing at least one fluorine atom; the agent containing the elements of (A) and the fluorine of (B) in a molar ratio A;
B of 1;
z, z being a real number and greater than 6;(C) one or more water-soluble compounds, which release copper ions, containing at least one copper atom; and (D) one or more water-soluble and/or water-dispersible compounds, which release metal ions, but are not a source of fluoride ions, containing at least one metal atom selected from the group consisting of calcium, aluminum and iron;
said agent;1) having a molar ratio D;
B representing total number of component (D) metal atoms to total number of component (B) fluorine atoms, D;
B;being no less than
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Specification