Abstract

The present invention is related to the field of metal surface preparation by anodizing processes and refers to a method for producing a corrosion-resistant aluminum-silicon alloy casting and more particularly to the optimization of the anodizing cast aluminum parts with high silicon content, by using a multiple step anodizing cycle. Moreover, the present invention refers to a corrosion-resistant aluminum-silicon alloy casting and its use.

IPC Classes  ?

• C25D 11/12 - Anodising more than once, e.g. in different baths
• C25D 11/08 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
• C25D 11/10 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
• C25D 11/16 - Pretreatment
• C25D 11/24 - Chemical after-treatment

Abstract

The present invention is related to the field of metal surface preparation by anodizing processes and refers to a method for producing a corrosion-resistant aluminum-silicon alloy casting and more particularly to the optimization of the anodizing cast aluminum parts with high silicon content, by using a multiple step anodizing cycle. Moreover, the present invention refers to a corrosion-resistant aluminum-silicon alloy casting and its use.

IPC Classes  ?

• C25D 11/08 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
• C25D 11/10 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
• C25D 11/12 - Anodising more than once, e.g. in different baths
• C25D 11/16 - Pretreatment
• C25D 11/24 - Chemical after-treatment

Abstract

The present invention is related to the field of metal surface preparation by anodizing processes and refers to a method for producing a corrosion-resistant aluminum-silicon alloy casting and more particularly to the optimization of the anodizing cast aluminum parts with high silicon content, by using a multiple step anodizing cycle. Moreover, the present invention refers to a corrosion-resistant aluminum-silicon alloy casting and its use.

IPC Classes  ?

• C25D 11/08 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
• C25D 11/10 - Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
• C25D 11/12 - Anodising more than once, e.g. in different baths
• C25D 11/16 - Pretreatment
• C25D 11/24 - Chemical after-treatment

Abstract

A method of selective metallization of butadiene-containing polymer regions in a component also containing non-butadiene-containing polymer regions is provided. Additionally presented is a kit for performance of the method. The method differs from known prior art methods in that, after the surface of the component has been contacted with a catalyst solution and before the component has been contacted with an accelerator solution, the component is rinsed with an aqueous alkaline rinse solution. This achieves the effect that, on addition of the accelerator solution, more catalyst atoms become detached from the non-butadiene-containing polymer regions than from the originally butadiene-containing polymer. A subsequent chemical deposition of a metal on the component surface is thus significantly more site-selective than without the rinse step with the aqueous alkaline rinse solution.

IPC Classes  ?

• C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating by reduction or substitution, i.e. electroless plating
• 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 18/28 - Sensitising or activating
• C23C 18/30 - Activating

Abstract

The invention relates to a sealing agent for metallic substrates that contains an aqueous dispersion consisting of: an oligosiloxane made of a glycidoxy silane or an epoxyalkyl silane or an epoxycycloalkyl silane, and at least one colloidal silicic acid, and further additives when appropriate, and water. The invention likewise relates to a metallic substrate sealed therewith. The sealing agent according to the invention is used as corrosion protection for metallic substrates.

IPC Classes  ?

• C23C 22/83 - Chemical after-treatment
• C09D 5/08 - Anti-corrosive paints
• C09D 183/06 - Polysiloxanes containing silicon bound to oxygen-containing groups
• C25D 5/48 - After-treatment of electroplated surfaces
• C23C 22/60 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH > 8

Abstract

The invention relates to an anode and to the use thereof in an alkaline electroplating bath. In the application in electroplating, said anode is suitable for use in highly alkaline electroplating electrolytes based on sodium hydroxide or potassium hydroxide for depositing zinc and zinc alloys onto substrates of steel and die-cast zinc.

IPC Classes  ?

• C25D 3/22 - ElectroplatingBaths therefor from solutions of zinc
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys
• C25D 17/02 - TanksInstallations therefor

Abstract

The invention relates to an alkali, galvanic bath for applying zinc or zinc alloys to substrates, wherein the anode chamber and the cathode chamber are separated from each other by a bipolar membrane. The galvanic bath is operated with zinc or zinc alloy baths that can comprise further additives. The invention further relates to a method for galvanic deposition of zinc or zinc alloys on substrates, wherein the substrate is placed in the galvanic bath according to the invention. The invention further relates to the use of bipolar membranes for separating the anode chamber and cathode chamber in galvanic baths, and for avoiding anodic disintegration of organic components of the electrolyte in galvanic baths.

IPC Classes  ?

• C25D 3/22 - ElectroplatingBaths therefor from solutions of zinc
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys
• C25D 17/02 - TanksInstallations therefor

Abstract

The invention relates to polymers which consist of at least partly crosslinked main chains formed from repeat units of the general formula (I), and optionally repeat units formed from five- or six-membered azaaromatics or nitrogen-containing heterocycles. Such polymers find use as an additive in galvanization baths, since they enable a better layer thickness distribution of the electroplated layer.

IPC Classes  ?

• C08G 73/02 - Polyamines
• C25D 3/02 - ElectroplatingBaths therefor from solutions
• C25D 3/22 - ElectroplatingBaths therefor from solutions of zinc
• C25D 3/12 - ElectroplatingBaths therefor from solutions of nickel or cobalt
• C25D 3/20 - ElectroplatingBaths therefor from solutions of iron
• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys