The invention relates to a biodegradable implant comprising a surface coated magnesium alloy or zinc alloy product, whereby the coating layer comprises oxides and/or phosphates of from rare-earth elements, Mg, Ca, Zn, Zr, Cu, Fe, Sr, Li, Mn or Ag wherein the coating is preferably generated by plasma electrolytically oxidation (PEO). The invention further comprises a method for preparing the coated magnesium or zinc alloy product of the implant.

The invention relates to a biodegradable implant comprising a surface coated magnesium alloy or zinc alloy product, whereby the coating layer comprises oxides and/or phosphates of from rare-earth elements, Mg, Ca, Zn, Zr, Cu, Fe, Sr, Li, Mn or Ag wherein the coating is preferably generated by plasma electrolytically oxidation (PEO). The invention further comprises a method for preparing the coated magnesium or zinc alloy product of the implant.

A multi-color application method and device for an aluminum alloy wheel. The method is used for preparing a wear-resistant ceramic layer on a surface of the aluminum alloy wheel by using a plasma coating (PLMC) system, includes the steps of: pretreating the wheel, spraying an insulating powder coating, curing an insulating powder coating, making a multi-color pattern, cleaning the multi-color pattern, forming a PLMC, performing blocking, performing water washing, drying the PLMC, forming a transparent powder coating, curing a transparent powder coating, forming the PLMC includes preparation of a ceramic film at a multi-color application position, an electrolyte is a phosphate-silicate system, and the PLMC system is provided with: a power supply, a mechanical arm and a plurality of oxidation tanks, the mechanical arm plays a supporting role in wheel transportation and an oxidation process; and the oxidation tanks are used to prepare the PLMC with different colors in the electrolyte.

A multi-color application method and device for an aluminum alloy wheel. The method is used for preparing a wear-resistant ceramic layer on a surface of the aluminum alloy wheel by using a plasma coating (PLMC) system, includes the steps of: pretreating the wheel, spraying an insulating powder coating, curing an insulating powder coating, making a multi-color pattern, cleaning the multi-color pattern, forming a PLMC, performing blocking, performing water washing, drying the PLMC, forming a transparent powder coating, curing a transparent powder coating, forming the PLMC includes preparation of a ceramic film at a multi-color application position, an electrolyte is a phosphate-silicate system, and the PLMC system is provided with: a power supply, a mechanical arm and a plurality of oxidation tanks, the mechanical arm plays a supporting role in wheel transportation and an oxidation process; and the oxidation tanks are used to prepare the PLMC with different colors in the electrolyte.