A zinc foil is provided that can be used as a negative electrode active material, and in a battery including the zinc foil as a negative electrode active material, the amount of gas generated during long term storage of the battery is reduced as compared with that in a battery including a conventional zinc foil. The zinc foil contains zinc as a main material and bismuth. The bismuth content is 100 ppm or more and 10000 ppm or less on a mass basis. The zinc crystal grain size is 0.2 μm or more and 8 μm or less. The bismuth crystal grain size is less than 1000 nm, as measured in a backscattered electron image obtained using a scanning electron microscope. The zinc foil is free of aluminum and/or lead, or even if the zinc foil contains aluminum and/or lead, the aluminum content is 1% or less on a mass basis and/or the lead content is 200 ppm or less on a mass basis.

A self-drilling screw (10) having a head (20), a shaft (30) at least partially wearing a thread (35) and a drill point (40). The base material of the screw (10) including the drill point (40) is integrally manufactured from an austenitic 300 series steel with a surface hardness (uncoated) of 400-600 HV 0.3. The surface of the screw has a top coating of Zn—Ni with a Ni-content between 12-15% deposited on the austenitic base material. This self-drilling screw (10) is manufactured from a blank of raw austenite 300 series steel which is initially squeezed by cold forming to reduce its diameter in a first operation and, in following cold forming operations the head, the drill point and a thread are formed.

A self-drilling screw (10) having a head (20), a shaft (30) at least partially wearing a thread (35) and a drill point (40). The base material of the screw (10) including the drill point (40) is integrally manufactured from an austenitic 300 series steel with a surface hardness (uncoated) of 400-600 HV 0.3. The surface of the screw has a top coating of Zn—Ni with a Ni-content between 12-15% deposited on the austenitic base material. This self-drilling screw (10) is manufactured from a blank of raw austenite 300 series steel which is initially squeezed by cold forming to reduce its diameter in a first operation and, in following cold forming operations the head, the drill point and a thread are formed.

The invention discloses a Zn—Ga series alloy and a preparation method and application thereof, belonging to the technical field of medical alloys. The Zn—Ga series alloy includes Zn and Ga, and Ga accounts for 0-30 wt % but not including 0. The preparation method is to mix Zn and Ga or Zn, Ga and trace elements, then to obtain a Zn—Ga series alloy by coating paint after smelting or sintering. The mechanical properties of the prepared Zn—Ga series alloy meet the requirements of the strength and toughness of medical implant materials, and it can be degraded in vivo. It has the dual characteristics of biological corrosion degradation and suitable corrosion rate to provide long-term effective mechanical support.

The invention discloses a Zn—Ga series alloy and a preparation method and application thereof, belonging to the technical field of medical alloys. The Zn—Ga series alloy includes Zn and Ga, and Ga accounts for 0-30 wt % but not including 0. The preparation method is to mix Zn and Ga or Zn, Ga and trace elements, then to obtain a Zn—Ga series alloy by coating paint after smelting or sintering. The mechanical properties of the prepared Zn—Ga series alloy meet the requirements of the strength and toughness of medical implant materials, and it can be degraded in vivo. It has the dual characteristics of biological corrosion degradation and suitable corrosion rate to provide long-term effective mechanical support.

A biodegradable Zn—Mg—Bi zinc alloy and a preparation method thereof. The method including: melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain Mg-50 wt. % Bi alloy ingot; melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth followed by heating to a preset temperature, stirring and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in a furnace followed by refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

A biodegradable Zn—Mg—Bi zinc alloy and a preparation method thereof. The method including: melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain Mg-50 wt. % Bi alloy ingot; melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth followed by heating to a preset temperature, stirring and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in a furnace followed by refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

A method includes disposing a braze material adjacent a first body and a second body; heating the braze material and forming a transient liquid phase; and transforming the transient liquid phase to a solid phase and forming a bond between the first body and the second body. The braze material includes copper, silver, zinc, magnesium, and at least one material selected from the group consisting of nickel, tin, cobalt, iron, phosphorous, indium, lead, antimony, cadmium, and bismuth.

A method includes disposing a braze material adjacent a first body and a second body; heating the braze material and forming a transient liquid phase; and transforming the transient liquid phase to a solid phase and forming a bond between the first body and the second body. The braze material includes copper, silver, zinc, magnesium, and at least one material selected from the group consisting of nickel, tin, cobalt, iron, phosphorous, indium, lead, antimony, cadmium, and bismuth.

A method of manufacturing a hot press-formed part by hot pressing a coated steel sheet formed with a Zn—Ni plating layer on a surface of a steel sheet includes: heating the coated steel sheet to a temperature range of Ac.sub.3 transformation temperature to 1000° C.; cooling the coated steel sheet to 550-410° C. at a cooling rate of 100° C./s or higher by squeezing the coated steel sheet with a press tool for cooling having flat surfaces configured to contact the coated steel sheet; press forming the coated steel sheet with a tool of press forming to obtain a formed body, the press forming being initiated within 5 seconds after the cooling while the temperature of the coated steel sheet is 550-400° C.; and quenching the formed body, while squeezing the formed body with the tool of press forming and holding at its press bottom dead center, to obtain a hot press-formed part.