Abstract

steps a) and b) take place consecutively or simultaneously.

IPC Classes  ?

• C23C 18/24 - Roughening, e.g. by etching using acid aqueous solutions
• C09K 13/08 - Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
• C23C 18/20 - Pretreatment of the material to be coated of organic surfaces, e.g. resins
• C23C 18/32 - Coating with one of iron, cobalt or nickelCoating with mixtures of phosphorus or boron with one of these metals

Abstract

The invention relates to a corrosion protection layer system for metal surfaces, said layer system comprising as the two top most layers: a) a discontinuous nickel-phosphorus layer and b) a chromium layer plated from a trivalent chromium electrolyte solution, as well as to a method of producing such a layer system. The inventive layer system is capable to combine the good corrosion resistance of the nickel-phosphorus layer against sodium chloride with the protective power of the chromium layer from the trivalent plating process against magnesium and calcium salts, especially without the need for any post-treatment.

IPC Classes  ?

• B32B 3/00 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form
• C25D 15/00 - Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
• C25D 3/06 - ElectroplatingBaths therefor from solutions of chromium from solutions of trivalent chromium
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys
• C25D 5/14 - Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
• C25D 5/00 - Electroplating characterised by the processPretreatment or after-treatment of workpieces

Abstract

The present invention relates to a chrome free etch for plating on plastic processes, wherein plastic surfaces are contacted in a first etching step with an etching solution at least comprising Mn(IV)-ions and, in a second etching step, with a solution at least comprising Mn(III)- and Mn(VII)-ions prior to the metal plating step.

IPC Classes  ?

• C23C 18/20 - Pretreatment of the material to be coated of organic surfaces, e.g. resins
• C23C 18/24 - Roughening, e.g. by etching using acid aqueous solutions
• C23C 18/30 - Activating
• C23C 18/34 - Coating with one of iron, cobalt or nickelCoating with mixtures of phosphorus or boron with one of these metals using reducing agents

Abstract

The invention relates to a corrosion protection layer system for metal surfaces, said layer system comprising as the two top most layers: a) a discontinuous nickel-phosphorus layer and b) a chromium layer plated from a trivalent chromium electrolyte solution, and method of producing such a corrosion protection layer system. The corrosion protection layer system provides corrosion resistance of the nickel-phosphorus layer against sodium chloride with the protection of the chromium layer produced from a trivalent process again magnesium salts, without the need for any post-treatment.

IPC Classes  ?

• B32B 3/00 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form
• C25D 15/00 - Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
• C25D 3/06 - ElectroplatingBaths therefor from solutions of chromium from solutions of trivalent chromium
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys
• C25D 5/14 - Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers

Abstract

The present invention relates to a chrome free etch for plating on plastic processes, wherein plastic surfaces are contacted in a first etching step with an etching solution at least comprising Mn(IV)-ions and, in a second etching step, with a solution at least comprising Mn(III)- and Mn(VII)-ions prior to the metal plating step.

IPC Classes  ?

• C23C 18/20 - Pretreatment of the material to be coated of organic surfaces, e.g. resins
• C23C 18/24 - Roughening, e.g. by etching using acid aqueous solutions
• C23C 18/30 - Activating
• C23C 18/34 - Coating with one of iron, cobalt or nickelCoating with mixtures of phosphorus or boron with one of these metals using reducing agents

Abstract

The invention relates to a corrosion protection layer system for metal surfaces, said layer system comprising as the two top most layers: a) a discontinuous nickel-phosphorus layer and b) a chromium layer plated from a trivalent chromium electrolyte solution, as well as to a method of producing such a layer system. The inventive layer system is capable to combine the good corrosion resistance of the nickel-phosphorus layer against sodium chloride with the protective power of the chromium layer from the trivalent plating process against magnesium and calcium salts, especially without the need for any post-treatment.

IPC Classes  ?

• C25D 3/06 - ElectroplatingBaths therefor from solutions of chromium from solutions of trivalent chromium
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys
• C25D 5/14 - Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
• C25D 15/00 - Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires