A coating method for a clad steel in which stainless sheets are combined on adjacent surfaces of an aluminum sheet may include preparing the clad steel, preparing a coating solution in which an epoxy resin and titanium dioxide (TiO.sub.2) powder are combined in an acrylic resin, etching the clad steel to improve adhesion property between the coating solution and the clad steel, heating the clad steel, and performing electrodeposition by immersing the clad steel in the coating solution.

The present disclosure provides an electronic product metal shell and a method of manufacturing the same. The electronic product metal shell includes: a metal layer; a first hard anodic oxidation layer formed on an upper surface of the metal layer; a second hard anodic oxidation layer formed on a lower surface of the metal layer; an antenna groove penetrating through the metal layer and the first hard anodic oxidation layer; and a non-conductive material filled in the antenna groove.

The present disclosure provides a metal shell of communication equipment. The metal shell of communication equipment includes a metal substrate, a slit penetrating an inner and an outer surface of the metal substrate, a plastic-supporting layer formed on the inner surface of the metal substrate and a decorative layer formed on the outer surface of the metal substrate, wherein a width of the slit on the outer surface of the metal substrate is 15-500 μm, a width of the slit on the inner surface of the metal substrate is 20-600 μm, and a ratio of the width of the slit on the inner surface of the metal substrate to the width of the slit on the outer surface of the metal substrate is between 1.05:1 and 1.5:1.

The present disclosure provides a metal shell of communication equipment. The metal shell of communication equipment includes a metal substrate, a slit penetrating an inner and an outer surface of the metal substrate, a plastic-supporting layer formed on the inner surface of the metal substrate and a decorative layer formed on the outer surface of the metal substrate, wherein a width of the slit on the outer surface of the metal substrate is 15-500 μm, a width of the slit on the inner surface of the metal substrate is 20-600 μm, and a ratio of the width of the slit on the inner surface of the metal substrate to the width of the slit on the outer surface of the metal substrate is between 1.05:1 and 1.5:1.

A colouring method for wrought aluminium alloy welded joint colour metallography, comprising pre-etching and colouring, wherein the pre-etching comprises an acid etching processing step. The acid etching processing is as follows: an acid etching solution is heated to 55° C.-65° C., dripped onto a test piece surface for 50 s-60 s, then flushed with a large amount of deionized water and dried with hot air. The acid etching solution is an aqueous solution comprising 0.3-0.5 mol/L of Cl.sup.−, 1.4-1.8 mol/L of H.sup.+ and 0.3-0.5 mol/L of PO.sub.4.sup.3−. The colouring is as follows: the test piece subjected to the pre-etching processing is completely immersed in a Weck's reagent, shaken slightly for 5-10 s, flushed with a large amount of deionized water after surface colouring and dried with hot air.

The present invention relates to a method of manufacturing a metal-polymer resin bonded body, including: degreasing metal using a degreasing solution; etching the metal using an etching solution; electrolyzing the metal using an electrolyte solution; and performing a polymer resin injection to bond a polymer resin to the metal, wherein the electrolyte solution includes a compound containing distilled water, oxalic acid, sulfuric acid, and carboxylic acid.

One embodiment of the present disclosure provides a method for producing a substrate formed with a copper thin layer. The method includes providing a carrier, forming a separation-inducing layer on the surface of the carrier, forming a copper thin layer on the separation-inducing layer, and bonding a core to the copper thin layer.

The hydrophobic and corrosion resistive film of cross-linked poly(hexafluoroisopropyl methacrylate) was prepared by photopolymerization. The starting materials were a monomer of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate, a photoinitiator of hydroxycyclohexyl phenyl ketone, and a cross-linker of poly(ethyleneglycol diacrylate). Photopolymerization was used to start polymerization and to cure the polymer film on an aluminum surface. Drop-casting was used to deposit the fluoropolymer onto an aluminum substrate (AA 3003). The fluoropolymer film has high corrosion protection when measured by potentiodynamic polarization and open circuit potential techniques in an aqueous solution of 3.5% NaCl. Fourier-transform infrared spectroscopy was used to monitor the polymerization process. The dynamic contact angle technique was used to measure the hydrophobicity for the fluorinated polymer coating. Thermal stability of the fluorinated polymer was measured using thermogravimetric analysis. Treatment with strong acid followed by contact angle measurements before and after the treatment confirmed the chemical resistance for the coated aluminum.

The hydrophobic and corrosion resistive film of cross-linked poly(hexafluoroisopropyl methacrylate) was prepared by photopolymerization. The starting materials were a monomer of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate, a photoinitiator of hydroxycyclohexyl phenyl ketone, and a cross-linker of poly(ethyleneglycol diacrylate). Photopolymerization was used to start polymerization and to cure the polymer film on an aluminum surface. Drop-casting was used to deposit the fluoropolymer onto an aluminum substrate (AA 3003). The fluoropolymer film has high corrosion protection when measured by potentiodynamic polarization and open circuit potential techniques in an aqueous solution of 3.5% NaCl. Fourier-transform infrared spectroscopy was used to monitor the polymerization process. The dynamic contact angle technique was used to measure the hydrophobicity for the fluorinated polymer coating. Thermal stability of the fluorinated polymer was measured using thermogravimetric analysis. Treatment with strong acid followed by contact angle measurements before and after the treatment confirmed the chemical resistance for the coated aluminum.

A multilayer plate with composite material and a method thereof are described. The multilayer plate includes an aluminum-based thin sheet and a composite material layer. The aluminum-based thin sheet includes a first passivation layer, an aluminum-based metal layer, and a second passivation layer sequentially. The aluminum-based thin sheet includes a first surface and a second surface opposite to the first surface. The first and second surfaces are set with micro holes. A diameter of the micro holes in the second surface is ranging from 0.5 μm to 10 μm. The composite material layer includes a thermoplastic polymer and a fiber material. The composite material layer has a third surface and a fourth surface opposite each other. The second surface is adjacent to or connected to the third surface. At least one portion of the thermoplastic polymer fills into the micro holes in the second surface.