This invention provides a technique that enables a chemical conversion coating excellent in adhesiveness and corrosion resistance to be formed on or over a magnesium material or magnesium alloy material and use of the technique. The above object is achieved by performing a surface conditioning treatment by using a surface conditioning agent that includes specific dibasic calcium phosphate particles before performing a chemical conversion for forming the chemical conversion coating.

This disclosure discloses a durable super-hydrophobic manganese dioxide coating, belonging to the field of metallic material surface treatment. The super-hydrophobic manganese dioxide coating includes manganese dioxide microspheres and a stearic acid shell. The manganese dioxide microspheres are encased in the stearic acid shell. The manganese dioxide microspheres are stacked hierarchically on the metallic material surface.

A method to treat the magnesium surface to manufacture the metallic assembly with the polymer and magnesium to have excellent bonding strength is disclosed. As a method to treat the magnesium surface for the bonded coupling of the mixture of the polymer and magnesium, this is a method including, (a) an etching step, wherein the magnesium surface is treated with an acidic solution; (b) a first surface treatment step, wherein the magnesium surface is treated with ultrasonic waves; (c) a second surface treatment step, wherein the magnesium surface is treated with an acidic solution; (d) a first silane coupling processing step, wherein the magnesium surface is treated with ultrasonic waves; (e) a surface activation treatment step, wherein the magnesium surface is treated with acidic solution; and (f) a second silane coupling processing step, wherein the magnesium surface is treated with ultrasonic waves.

A method to treat the magnesium surface to manufacture the metallic assembly with the polymer and magnesium to have excellent bonding strength is disclosed. As a method to treat the magnesium surface for the bonded coupling of the mixture of the polymer and magnesium, this is a method including, (a) an etching step, wherein the magnesium surface is treated with an acidic solution; (b) a first surface treatment step, wherein the magnesium surface is treated with ultrasonic waves; (c) a second surface treatment step, wherein the magnesium surface is treated with an acidic solution; (d) a first silane coupling processing step, wherein the magnesium surface is treated with ultrasonic waves; (e) a surface activation treatment step, wherein the magnesium surface is treated with acidic solution; and (f) a second silane coupling processing step, wherein the magnesium surface is treated with ultrasonic waves.

Anti-corrosive conversion coating compositions are disclosed. The anti-corrosive conversion coating compositions include a biopolymer and a rare earth element compound. Implementations of the anti-corrosive conversion coating composition can include where the biopolymer includes chitosan, starch, inulin, dextran, pullulan, or a combination thereof. The rare earth element compound may include one or more of the lanthanide series of elements, scandium, yttrium, or a combination thereof. The rare earth element compound may include a hydroxide of a rare earth element, an oxide of a rare earth element, or a combination thereof. Coated articles and methods for applying the anti-corrosive conversion coating compositions are also disclosed.

A coated metal alloy substrate with at least one chamfered edge, a process for producing a coating a metal alloy substrate, and an electronic device having a housing comprising a coated metal alloy substrate are described. The coated metal alloy substrate with at least one chamfered edge comprises a hydrophobic anti-fingerprint layer deposited on the metal alloy substrate, a passivation layer deposited on the at least one chamfered edge, and a water based paint layer deposited on the passivation layer.

A coated metal alloy substrate with at least one chamfered edge, a process for producing a coating a metal alloy substrate, and an electronic device having a housing comprising a coated metal alloy substrate are described. The coated metal alloy substrate with at least one chamfered edge comprises a hydrophobic anti-fingerprint layer deposited on the metal alloy substrate, a passivation layer deposited on the at least one chamfered edge, and a water based paint layer deposited on the passivation layer.

A coated metal alloy substrate, a process for producing a coating a metal alloy substrate, and an electronic device having a housing comprising a coated metal alloy substrate are described. The coated metal alloy substrate comprises a passivation layer deposited on the metal alloy substrate, a porous conductive water borne carbon nanotube layer on the passivation layer, and an electrophoretic deposition layer deposited on the porous conductive water borne carbon nanotube layer.

A conversion coating applicator includes a first liner, a hydrogel attached to the first liner, and a second liner removably attached to the hydrogel. The hydrogel includes a trivalent chromium conversion coating solution including a trivalent chromium compound, a zirconate compound, and a dye compound. The conversion coating solution is an aqueous solution.

A conversion coating applicator includes a first liner, a hydrogel attached to the first liner, and a second liner removably attached to the hydrogel. The hydrogel includes a trivalent chromium conversion coating solution including a trivalent chromium compound, a zirconate compound, and a dye compound. The conversion coating solution is an aqueous solution.