目的 提高螺纹钢的耐蚀性能。 方法 采用模拟穿水淬火冷却工艺,在加入 ZnSO4 缓蚀剂的介质中对 Q235 螺纹钢进行淬火热处理。 通过 XRD 测试、大气腐蚀和电化学测试(包括极化曲线和交流阻抗)等手段对不同淬火介质中 Q235 螺纹钢进行表征和测试。 结果 淬火处理后试样表面生成 Fe2O3、Fe3O4 和 Zn(OH)2 的保护膜,当 ZnSO4 缓蚀剂添加量达到 120 mg/ L 时,Q235 螺纹钢的腐蚀速度由自来水淬火状态的 0. 4583 g/ (d·m2)降低到 0. 2083 g/ (d·m2),腐蚀速度降低了 54. 5% ;Q235 螺纹钢的腐蚀电位由-0. 3752 V 提高到-0. 2997 V,增加了 20. 1% ;腐蚀电流由 5. 2482×10-5 A 降低到 1. 6082×10-5A,降低了 69. 3% ;容抗谱 Rr 由 25. 58 Ω 增加到 32. 52 Ω,增加了 27. 1% 。 Q235 螺纹钢在模拟雨水中的极化形式为电化学极化。 结论 ZnSO4 缓释剂可有效提高 Q235 螺纹钢的耐蚀性能。

Objective To improve the properties of corrosion resistance of steel Q235. Methods The quenching heat treatments were performed with simulated water quench process on steel Q235 after adding ZnSO4 inhibitor medium. The steel Q235 was characterized and tested by XRD testing, atmospheric corrosion, and electrochemical tests (including polarization curves and AC impedance) under different solutions. Results Fe2O3, Fe3O4 and Zn(OH)2 protective films were generated on the sample surface. When the amount of corrosion inhibitor ZnSO4 reached 120 mg/ L, the corrosion rate was reduced to 0. 2083 g/ (d·m2) from 0. 4583 g/ (d·m2) in the water quenching. The rebar corrosion rate was reduced by 54. 5% . The corrosion potential increased from -0. 3752 V to -0. 2997 V of Q235, the corrosion potential increased by 20. 1% , the corrosion current reduced from 5. 2482×10-5 A to 1. 6082×10-5 A, the corrosion current was reduced by 69. 3% , the capacitance spectrum value Rr increased from 25. 58 Ω up to 32. 52 Ω which was increased by 27. 1% . The polarization of Q235 in simulated rain was the form of electrochemical polarization. Conclusion ZnSO4 inhibitor can effectively alleviate Q235 steel corrosion resistance.