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The influence of direct current interference on the corrosion behavior of HRB400 and HRB400M steel bars in simulated concrete solution was studied using methods such as weight loss experiment, electrochemical experiment, surface technology and product analysis. The research results showed that with the increase of DC interference voltage, the corrosion rates of HRB400 and HRB400M steel bars would increase. The corrosion resistance of HRB400M steel bars was better than HRB400 steel bars under the experimental conditions. In addition, direct current interference could cause damage to the corrosion product layer on the surface of HRB400 steel bars and HRB400M steel bars. And the corrosion form and corrosion product types of HRB400 and HRB400M steel bars would be affected by direct current interference. The main corrosion products of HRB400 steel bars included γ-FeOOH and Fe 2 O 3  when it was not interfered by DC. When DC interference was applied, the main corrosion products included Fe 3 O 4  and Fe 2 O 3 . The corrosion products on the surface of HRB400M steel bars were mainly Fe 3 O 4  and Fe 2 O 3 , and the types of products increased to form Cr 2 O 3  and MnFe 2 O 4 .

Corrosion behavior of HRB400 and HRB400M steel bars in concrete under DC interference