Process of treating metallic surfaces

A process of treating zinc, magnesium or aluminum or of the alloys of zinc, magnesium or aluminum surfaces for application of lacquers, plastic coatings, paints, sealing compounds or adhesives comprising the steps of:

• cleaning a metallic surface comprising at least one metal selected from the group consisting of zinc, zinc alloy, magnesium, magnesium alloy, aluminum and aluminum alloy to remove oxidic layers, said cleaning step comprising subjecting said metallic surface to at least one of an alkaline pickling or an acid pickling bath and rinsing the pickled metallic surface with water;
• treating the metallic surfaces at 10 to 100° C. by at least one of dipping, spraying and rolling with an aqueous solution having a pH from 2 to 13, said solution comprising 10−5 to 1 mol/l of at least one compound of the formula XYZ, wherein
• Y is a straight-chain organic group of 2 to 50 carbon atoms;
• X is COOH—, HSO3—, HSO4—, (OH)2PO—, (OH2)PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• and
• Z is OH—, SH—, NH2—, NHR′—, CN—, CH═CH2—, OCN—, CH2═CR″—COO—, acrylamide, (OH)2PO—, (OH)2PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• R′ is a C1 to C4 alkyl group;
• R″ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms;
• wherein groups X and Z are each bound to the group Y in their terminal position;
• wherein said X group chemically bonds directly to said metallic surface.

A process for preparing a film coated metallic surface comprising the steps of:

• subjecting a metallic surface comprising at least one metal selected from the group consisting of zinc, zinc alloy, magnesium, magnesium alloy, aluminum and aluminum alloy to at least one of an alkaline pickling or an acid pickling bath under conditions that do not substantially form metal oxides or metal hydroxides on said metallic surface;
• subsequently rinsing the pickled metallic surface with water;
• treating the metallic surfaces at 10 to 100° C. by at least one of dipping, spraying and rolling with an aqueous solution having a pH from 2 to 13, said solution comprising 10−5 to 1 mol/l of at least one compound of the formula XYZ, wherein Y is a straight-chain organic group of 2 to 50 carbon atoms;
• X is a COOH—, HSO3—, HSO4—, (OH)2PO—, (OH2)PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• and
• Z is OH—, SH—, NH2—, NHR′—, CN—, CH═CH2—, OCN—, CH2═CR″—COO—, acrylamide, (OH)2PO—, (OH)2PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• R′ is a C1 to C4 alkyl group;
• R″ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms;
• wherein groups X and Z are each bound to the group Y in their terminal position;
• wherein at least a portion of said metallic surface is chemically bonded to said compound of formula XYZ.

A process for preparing a film coated metallic surface comprising the steps of:

• subjecting a metallic surface comprising at least one metal selected from the group consisting of zinc, zinc alloy, magnesium, magnesium alloy, aluminum and aluminum alloy to at least one of an alkaline pickling or an acid pickling bath under conditions that do not substantially form metal oxides or metal hydroxides on said metallic surface;
• subsequently rinsing the pickled metallic surface with water;
• treating the metallic surfaces at 10 to 100° C. by at least one of dipping, spraying and rolling with an aqueous solution having a pH from 2 to 13, said solution comprising 10−5 to 1 mol/l of at least one compound of the formula XYZ, wherein Y is a straight-chain organic group of 10 to 12 carbon atoms;
• X is a COOH—, HSO3—, HSO4—, (OH)2PO—, (OH2)PO2—, (OH)(OR)PO— or (OH)(OR)PO2;
• and
• Z is OH—, SH—, NH2—, NHR′—, CN—, CH═CH2—, OCN—, CH2═CR″—COO—, acrylamide, (OH)2PO—, (OH)2PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• R′ is a C1 to C4 alkyl group;
• R″ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms;
• wherein groups X and Z are each bound to the group Y in their terminal position;
• wherein at least a portion of said metallic surface is chemically bonded to said compound of formula XYZ to form the film coated metal surface.

A process for preparing a film coated metallic surface comprising the steps of:

• subjecting a metallic surface comprising at least one metal selected from the group consisting of zinc, zinc alloy, magnesium, magnesium alloy, aluminum and aluminum alloy to at least one of an alkaline pickling or an acid pickling bath under conditions that do not substantially form metal oxides or metal hydroxides on said metallic surface;
• subsequently rinsing the pickled metallic surface with water;
• treating the metallic surfaces at 10 to 100° C. by at least one of dipping, spraying and rolling with an aqueous solution having a pH from 2 to 13, said solution comprising 10−5 to 1 mol/l of at least one compound of the formula XYZ, wherein Y is a straight-chain organic group of 2 to 50 carbon atoms;
• X is a COOH—, HSO3—, HSO4—, (OH)2PO—, or (OH2)PO2—;
• and
• Z is OH—, SH—, NH2—, NHR′—, CN—, CH═CH2—, OCN—, CH2═CR″—COO—, acrylamide, (OH)2PO—, and (OH)2PO2—;
• R′ is a C1 to C4 alkyl group;
• R″ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms;
• wherein groups X and Z are each bound to the group Y in their terminal position;
• wherein at least a portion of said metallic surface is chemically bonded to the compound of formula XYZ to form the film coated metal surface.

A treated metallic substrate comprising:

• a metal substrate having a metal surface, said metal being selected from the group consisting of zinc, magnesium and aluminum, said metal surface being film coated with a coating comprising at least one compound of the formula XYZ, wherein
• Y is a straight-chain organic group of 2 to 50 carbon atoms;
• X is a COOH—, HSO3—, HSO4—, (OH)2PO—, (OH2)PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• and
• Z is OH—, SH—, NH2—, NHR′—, CN—, CH═CH2—, OCN—, CH2═CR″—COO—, acrylamide, (OH)2PO—, (OH)2PO2—, (OH)(OR′)PO— or (OH)(OR′)PO2;
• R′ is a C1 to C4 alkyl group;
• R″ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms;
• wherein groups X and Z are each bound to the group Y in their terminal position;
• wherein said at least one compound of formula XYZ comprises at least one of a phosphoric acid group, a phosphonic acid group, an amino group and a thiol group.