Method and device for preparing corrosion-resistant hot stamping part

A method for manufacturing a corrosion-resistant hot-stamping part without shot blasting, comprising:

• blanking a bare steel plate into a required blank shape,
• heating the blank to above AC3 in an oxygen-free heating furnace to austenitize the blank;
• wherein the oxygen-free heating furnace is a vacuum heating furnace and a vacuum degree of the vacuum heating furnace is 50-500 Pa;
• putting the austenitized blank into a mold to mold a part;
• conducting an ultrasonic cleaning or pickling on the part, then using an electroplating process to form a corrosion-resistant coating layer on a surface of the part;
• and
• conducting a dehydrogenation treatment;
• wherein the dehydrogenation treatment comprises heating the part to 140° C.-190° C. and insulating the part at the temperature for 10-30 min;
• wherein the electroplating process comprises firstly using a current density of 5-10 A/dm2 for 0.5-2 min to strike plating the part;
• and using a current density of 1-3 A/dm2 for 1-15 min to electroplating the part;
• wherein a tensile strength of the part after treated reaches 1300-1650 Mpa
• wherein the step heating the blank to above AC3 in an oxygen-free heating furnace to austenize the blank, wherein the oxygen-free heating furnace is a vacuum heating furnace and a vacuum degree of the vacuum heating furnace is 50-500 Pa comprises:
• putting the blanking blank into an oxygen-free furnace;
• starting vacuum pump to vacuumize the furnace to make the vacuum degree inside of the furnace 50-500 Pa;
• then using nitrogen gas inflate the vacuum furnace which makes the inside of vacuum furnace to achieve one atmospheric pressure;
• and
• heating the blank to above AC3 to austenize the blank;
• wherein the oxygen-free heating furnace is a vacuum heating furnace and a vacuum degree of the vacuum heating furnace is 50-500 Pa.