Provided is a production method of an ultra-thin
steel belt plated with
precious metal. The production method includes the steps that a DC01 cold-rolled steel plate is used as a
raw material, and conventional
degreasing is conducted after the steel plate is cold-rolled repeatedly; annealing is conducted; the belt is prepared, specifically, uncoiling, striping and burr removal are carried out; Zn / Fe
electroplating, primary water-washing and
drying, primary
physical vapor deposition, secondary water-washing and
drying and secondary
physical vapor deposition are carried out sequentially; and the belt is rolled after being naturally cooled to be at the
room temperature. According to the
steel belt, the Rm is 200-230 MPa, the percentage of elongation is 45%-50%, the
surface roughness of an Au-plated or Ag-plated
coating is 0.05-0.10 micron, and the
specular reflection is 99%-99.9%; after the
coating is stored on the indoor atmospheric condition for 1800 days, the
specular reflection of the
coating is 98.7%-99.7%, the gloss
loss rate is not higher than 0.5%, and the rate of the corroded area is not higher than 0.05%; after the coating is exposed in air containing 30 ppmH2S for 1200 days, the
specular reflection of the coating is 98.5%-99.5%, the gloss
loss rate is not higher than 0.6%, and the rate of the corroded area is not higher than 0.08%; for a Pt-plated
steel belt, the
surface roughness is 0.03-0.06 micron, the
porosity is not higher than five each
square centimeter, and the specular reflection is 99.5%-99.9%; and after the coating is stored in the 50-KHz ultrasonic environment continuously for 2400 hours, the thickness of the coating is not changed, and the surface has no crack.