Method for preparing stainless reinforcing steel bar resistant to corrosion of chloride ions

A method for preparing a stainless reinforcing steel bar resistant to corrosion of chloride ions, comprising the following steps of:

• (a) selecting a reinforcing steel bar blank, and performing oil removing, rust removing, water washing, and drying treatments on the surface of the reinforcing steel bar blank to be treated, or directly performing sand blasting or shot blasting on a reinforcing steel bar blank whose surface is only slightly rusted;
• wherein the reinforcing steel bar blank has the following chemical ingredients in terms of percentage by weight:
• C:
• 0.01-0.08 wt %, Mn:
• 0.10-0.50 wt %, P:
• ≤0.04 wt %, S:
• ≤0.03 wt %, Si:
• 0.2-0.6 wt %, Cr:
• 2.0-8.0 wt %, Mo:
• 1.50-2.50 wt %, Cu:
• 0.08-0.35 wt %, Ti:
• 0.10-0.40 wt %, and Fe and inevitable impurities as the balance;
• (b) performing heat diffusion by placing the reinforcing steel bar blank in a chromium-containing environment, and keeping at a certain temperature for a certain time such that chromium in the environment is capable of diffusing into the surface of the reinforcing steel bar blank to form a chromium-containing diffusion layer, in which an effective diffusion layer having a chromium content exceeding 12% has a thickness exceeding 10 μm;
• and
• (c) performing cooling treatment on the reinforcing steel bar which has been treated by heat diffusion;
• wherein
• after the heat diffusion treatment is completed and when a heat diffusion treatment container is cooled to 100° C. or less along with a heat diffusion treatment furnace, the heat diffusion treatment container is withdrawn from the heat diffusion treatment furnace and subjected to air cooling to room temperature continuously, and then the reinforcing steel bar is separated from a heat diffusion powder.