Anodic oxide coatings that provide corrosion resistance to parts having protruding features, such as edges, corners and convex-shaped features, are described. According to some embodiments, the anodic oxide coatings include an inner porous layer and an outer porous layer. The inner layer is adjacent to an underlying metal substrate and is formed under compressive stress anodizing conditions that allow the inner porous layer to be formed generally crack-free. In this way, the inner porous layer acts as a barrier that prevents water or other corrosion-inducing agents from reaching the underlying metal substrate. The outer porous layer can be thicker and harder than the inner porous layer, thereby increasing the overall hardness of the anodic oxide coating.

The present disclosure relates to an electrode for eloxing a component, in particular a component of a vehicle brake system, comprising an electrolyte inlet for feeding an electrolyte into the electrode, an inlet channel, which connects the electrolyte inlet to an electrolyte outlet opening formed in the region of an outer surface of the electrode, an electrolyte inlet opening formed in the region of the outer surface of the electrode at a distance from the electrolyte outlet opening, an electrolyte flow path, which runs between the electrolyte outlet opening and the electrolyte inlet opening along the outer surface of the electrode and is designed to bring a surface portion of the component, which surface portion is to be eloxed, into fluid contact with the electrolyte flowing through the electrolyte flow path, an outlet channel, and an electrolyte outlet.

A substrate that includes a base layer having a first principal surface defining a plurality of first trenches and intervening first lands, and a cover layer provided over the first principal surface of the base layer and covering the first trenches and first lands substantially conformally, wherein the surface of the cover layer remote from the first principal surface of the base layer comprises a plurality of second trenches and intervening second lands defined at a smaller scale than the first trenches and first lands. The substrate may be used to fabricate a capacitive element in which thin film layers are provided and conformally cover the second trenches and second lands of the cover layer, to create a metal-insulator-metal structure having high capacitance density.

A substrate that includes a base layer having a first principal surface defining a plurality of first trenches and intervening first lands, and a cover layer provided over the first principal surface of the base layer and covering the first trenches and first lands substantially conformally, wherein the surface of the cover layer remote from the first principal surface of the base layer comprises a plurality of second trenches and intervening second lands defined at a smaller scale than the first trenches and first lands. The substrate may be used to fabricate a capacitive element in which thin film layers are provided and conformally cover the second trenches and second lands of the cover layer, to create a metal-insulator-metal structure having high capacitance density.

Metal components that require anodic coating or anodizing, may also require some surfaces of the component to be free of the anodic coating for the purpose of conductivity. The presence of the anodic coating on surfaces of the component that require conductivity would make those surface more electrically resistant or nonconductive. A combination of a gas pocket or air bubble to create a barrier to anodizing in a cavities of a workpiece (or in a cavity created by a conformal compression material) and the use of a (e.g., compressible) mask/seal material to mask off other surfaces though a gasket sealing function, is used. The mask/seal material may be compressed and makes a seal of some surfaces using pressure from clamping or pressure mechanisms. At least two opposing surfaces are masked by the compressive mask/seal material on one end and a gas pocket on the other end. The gas pocket will allow the anode to make firm electrical contact with the workpiece. The unmasked surfaces of the workpiece will be contacted by the electrolyte and consequently anodized. These anodized surfaces will have more electrical resistance (e.g., have higher resistance, and might even be non-conductive) than the masked surfaces that were not anodized. Further, the selectively anodized surfaces can be colored, seal, or have other conventional post anodizing processes applied.

A coated metal alloy substrate for an electronic device, a process for producing a coated metal alloy substrate for an electronic device and a housing for an electronic device, comprising a coated metal alloy substrate wherein the coated metal alloy CA substrate comprises at least one chamfered edge (1) and comprises: a passivation layer (2) deposited on the at least one chamfered edge (1); an electrophoretic deposition layer (3) deposited on the passivation layer (2); and a hydrophobic layer (4) deposited on the electrophoretic deposition layer (3).

In example implementations, a method for producing a coating is provided. The method includes placing a magnesium substrate into an anodizing bath, applying a voltage for a first amount of time to form a micro-porous anodizing layer having a thickness of between 1 to 50 microns on the magnesium substrate, placing the magnesium substrate with the micro-porous anodizing layer in plating bath, wherein the plating bath comprises a metal and a complexing agent with a pH between 8 and 14, applying a first current to the plating bath for a second amount of time to form an interlock layer on the micro-porous anodizing layer, and applying a second current to the plating bath for a third amount of time to form a coating on the interlock layer.

Method for manufacturing a fire-resistant part of an air conditioning system for an air or rail transport vehicle, characterized in that it includes at least the following steps: a step of obtaining a part including at least one aluminum alloy surface portion, and a step of treating the aluminum alloy surface portion by use of micro-arc oxidation in order to produce a ceramic coating on the surface portion.

A method of providing a workpiece with an anodised aluminium surface with varying colour. The anodised surface is added colour, such as evenly, so that a colour concentration profile exists through the depth, where after a portion of the outer layer is removed to arrive at colour corresponding to a particular depth.

This application describes covers for electronic devices, electronic devices, and methods for making the covers. In one example, described herein is a cover for an electronic device comprising: a substrate comprising a metal; a passivation layer or a micro-arc oxidation layer deposited on at least one surface of the substrate; a primer coating layer on the passivation layer or the micro-arc oxidation layer; an optional base coating layer on the primer coating layer; a top coating layer on the optional base coating layer or on the primer coating layer; and a hydrophobic coating layer.