热处理工艺对2205双相不锈钢耐蚀性能的影响

摘要

To Treat 2205 duplex stainless steel by heat treatment process at different temperature,then observe the microstructure of 2205 duplex stainless steel after corrosion in the liquid of 0.33 mol/L FeCl3+0.05 mol/L HCl by a metalloscope and a scanning electron microscope; Test the microhardness and the corrosion resistance of 2205 duplex stainless steel in boiled 65% HNO3 for 24 hrs as well as the pitting potential in 3.5%NaCl liquid at 25℃. The experimental results indicated that σ phase precipitation appeared in 2205 duplex stainless steel heated at 750～900℃ for 4hrs, and the microhardness was increased. At the same time the pitting potential decreased and the corrosion rate increased with the heat treatment temperature rising.%对2205双相不锈钢采用不同温度进行热处理,然后用光学显微镜和电子扫描电镜观察其在0.33 mol/L FeCl3+0.05 mol/L HCl溶液中腐蚀后的形貌;测试其显微硬度的变化、在沸腾的65%的硝酸溶液中浸蚀24 h的腐蚀速率和在25℃的3.5%NaCl溶液中的点蚀电位.研究表明:2205双相不锈钢在750～900℃保温4 h有σ相析出,材料的显微硬度增大.同时随着热处理温度的升高,2205双相不锈钢的点蚀电位降低,腐蚀速率增大.