A method of treating a substrate, the method comprising: delivering substantially simultaneously a first set of particles comprising a dopant and a second set of particles comprising an abrasive from at least one fluid jet to a surface of the substrate, to impregnate the surface of the substrate with the dopant; wherein the dopant comprises a corrosion-inhibiting or adhesion-promoting species, such as to form a corrosion-inhibiting or adhesion-promoting coating at or on the surface of the substrate. Also provided is an article comprising a substrate having a corrosion-inhibiting or adhesion-promoting coating, the said coating comprising particles of a corrosion-inhibiting or adhesion-promoting species that impregnate the surface of the substrate (e.g. as produced by the above method).

Embodiments of the present disclosure provide a surface treatment composition and methods for using same. The composition for removing contaminants from a metallic surface, can include 3 wt % to 40 wt % of at least one bifunctional alkaline compound, 0.03 wt % to 10 wt % of at least one oxidizer comprising a metal salt, and water, where all weight percentages are based on the total weight of the composition.

An additive supply apparatus for a high-pressure liquid jet system is provided. The additive supply apparatus includes a processing head having a central bore extending along a central longitudinal axis of the processing head from a proximal end to a distal end. The additive supply apparatus also includes a first aperture fluidly connected to the central bore to supply a fluid jet to flow longitudinally within the processing head, a second aperture fluidly connected to the central bore to supply a flow of gas to the processing head, and a third aperture fluidly connected to the central bore to supply a flow of an additive fluid to the processing head. The additive supply apparatus further includes a fluid mixing insert disposed within the central bore and fluidly connected to the first, second and third apertures, and a mixing tube in fluid communication with and downstream from the fluid mixing insert.

Powder chamber for an air polishing device, extending from a top end to a bottom end along an axis, said powder chamber including at least two wall sections, where a first wall section forms a first angle with respect to the axis, and where a second wall section forms a second angle with respect to the axis, where the angles are measured in a measuring direction from the axis to the appropriate wall section in such a manner so that the acute angles are obtained, where the measuring direction from the top end to the bottom end is counted positive, and where the measuring direction from the bottom end to the top end is counted negative, where the second wall section is arranged below the first wall section, and where the second angle is smaller than the first angle.

A surface polishing method for micro inner flow channel, a micro inner flow channel part and a polishing medium. The diameter of the micro inner flow channel is less than or equal to 3 mm and length-diameter ratio is greater than or equal to 50:1. A polishing medium including a liquid phase and a solid phase, and viscosity of the liquid phase <1000 cP, the solid phase includes abrasive particles; a predetermined pressure being set on the polishing medium, making the polishing medium flow in the micro inner flow channel at a flow velocity more than 5 m/s, and flow rate of the polish polishing medium flowing into the micro inner flow channel at one end reaches a saturation flow rate allowed by the bore of the micro inner flow channel, making the hydraulic pressure inside the inner flow channel be in a pressure holding state.

Methods and devices for treatment of metal surfaces by means of electrically active solid particles that include a step of contact of the solid particles with the electrode of an electric source, a step of shooting the particles towards the metal surface to be treated and a step of transmission of electric charge of the particles on the metal surface to be treated. The transmission of the electricity between the electric source and the metal surface during the step of shooting preferably is by net charge of the particles or by electric conductivity by contact or by electric conductivity by means of voltaic arches. The current applied to the electrode is preferably a DC or a current that contains positive sections and negative sections.