Cu对低碳钢耐腐蚀和抑菌性能的影响

Effects of Cu Content on the Corrosion Resistance and Antibacterial Property of Low Carbon Steels

低碳钢不仅要求其具有较高的强度和硬度,而且耐腐蚀性和抑菌性也至关重要。为了研究不同Cu含量的低碳钢在复杂工况环境下的耐腐蚀和抑菌性能,选取了4种不同组织钢种:MS1500、S-Ten2、F92和17-4PH。实验选择了酸性(pH=3)、中性(pH=7)、碱性(pH=11)和菌液(大肠杆菌和葡萄球菌)4种溶液来模拟材料应用的复杂环境,采用动电位极化、电化学阻抗谱测试和浸泡实验对比分析了它们在4种环境下的耐腐蚀性能,并在菌液环境中进行了材料抑菌实验。另外,通过对不同热处理后的S-Ten2低碳钢进行抑菌实验,进一步研究了不同Cu析出状态对低碳钢抑菌性能的影响。实验结果表明:F92和17-4PH 2种低碳钢在4种环境下均表现出了优异的耐蚀腐性能;在强碱环境下4种材料的耐腐蚀性能相近。S-Ten2在碱性环境下的耐腐蚀性能优于酸性和中性环境,而MS1500的耐腐蚀性能在所有实验环境下相对稳定。在葡萄球菌液中,F92和17-4PH的耐蚀性能优于MS1500和S-Ten2。通过对S-Ten2不同热处理后,大肠杆菌液中900℃-6 h-水淬和560℃-6 h-空冷的样品抑菌性优于700℃-5 min-固溶的样品,说明合理的热处理可以使Cu析出达到理想抑菌效果,但在葡萄球菌液中,3种不同热处理的样品抑菌性均不理想。

Low carbon steels require not only high strength and hardness, but also good corrosion resistance and antibacterial property. In order to study the corrosion resistance and antibacterial property of different low carbon steels with different Cu contents under complex working conditions, four steels with different microstructures were selected: MS1500, S-Ten2, F92 and 17-4PH. Acidic(pH=3), neutral(pH=7), alkaline(pH=11) and bacterial solutions(escherichia coli and staphylococcus) were selected to simulate the complex environment in which the materials were applied. Their corrosion resistances in these four environments were compared and analyzed by potentiodynamic polarization, electrochemical impedance spectroscopy test and immersion test. The bacteriostatic experiment of the materials was carried out in the bacteria solution environment. In addition, the effect of different Cu precipitation states on the bacteriostatic performance of low carbon steel was further studied through bacteriostatic experiments on S-Ten2 low carbon steels treated with different heat treatments. Results showed that F92 and 17-4PH low carbon steels exhibited excellent corrosion resistance in four environments. The corrosion resistances of the four materials were similar in strong alkali environment. The corrosion resistance of S-Ten2 in alkaline environment was better than that in acidic and neutral environments, and the corrosion resistance of MS1500 was relatively stable in all experimental environments. The corrosion resistances of F92 and 17-4PH were better than that of MS1500 and S-Ten2 in staphylococcal fluid. The antibacterial property of S-Ten2 samples with 900 ℃-6 h water quenching and 560 ℃-6 h air cooling was better than that with 700 ℃-5 min solid solution in escherichia coli solution, indicating that reasonable heat treatment could make the Cu precipitate achieve ideal bacteriostatic effects, but in staphylococcal solution, the bacteriostatic property of samples treated with three different heat treatments were not good.