时效处理对含铜不锈钢耐蚀性能的影响

发布时间：2018-01-03 20:31

  本文关键词：时效处理对含铜不锈钢耐蚀性能的影响　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 含铜不锈钢 时效处理 富铜相 晶界敏化 耐蚀性能

【摘要】：含铜抗菌不锈钢是通过在普通不锈钢的基础上添加一定量的铜而制成的一种新型结构功能一体化材料。它的良好而持久的抗菌性能是源自不锈钢在固溶、时效处理中析出的富铜相。然而,时效往往会使材料的耐蚀性能降低,一定程度上限制了材料的实际应用。因此,研究含铜抗菌不锈钢时效后耐蚀性降低的机理,对于促进含铜不锈钢的实际应用具有重要意义。本文通过对普通不锈钢和含铜不锈钢进行不同的时效处理,对比研究了时效处理对含铜不锈钢耐蚀性能的影响及相关机制。采用了如下的分析和表征手段:双环动电位再极化、动电位极化和静电位极化方法分析不同热处理状态下材料的耐蚀性能;透射电镜、3D原子探针分析含铜不锈钢时效过程的析出相,光学显微镜、激光共聚焦显微镜分析材料表面的腐蚀形貌。实验结果表明:含铜304L不锈钢最易发生晶界敏化的时效温度为735℃,该温度下发生晶界敏化的时间为1.4h;700℃时效10h,随着时效时间的延长,含铜304L不锈钢的点蚀电位从230mV下降到160mV,耐晶间腐蚀性能和耐点蚀性能均降低;相同时效状态下,含铜不锈钢的耐晶间腐蚀性能和耐点蚀性能均比普通不锈钢低。造成含铜不锈钢发生敏化现象、进而降低其耐晶间腐蚀和耐点蚀性能的原因是富铜相的析出,而不是碳化物的析出。而且,由于富铜相具有快速的形核能力,含铜不锈钢发生晶界敏化所需的时间更短(700℃下时效,含铜304L不锈钢发生敏化的时间为2h,普通304L不锈钢发生敏化的时间为10h),敏化温度区间更大。但由于富铜相的长大速率降低,含铜不锈钢的敏化速率随时效时间的增加而逐渐降低。
[Abstract]:Copper-containing antibacterial stainless steel is a new kind of structure-functional integrative material which is made by adding a certain amount of copper on the basis of common stainless steel. Its good and lasting antibacterial properties are derived from the solid solution of stainless steel. The copper-rich phase precipitated in aging treatment. However, aging will often reduce the corrosion resistance of the material, which limits the practical application of the material to a certain extent. It is of great significance to study the mechanism of corrosion resistance reduction of copper containing antibacterial stainless steel after aging, which is of great significance to promote the practical application of copper containing stainless steel. In this paper, different aging treatment of common stainless steel and copper containing stainless steel is carried out. The effect of aging treatment on corrosion resistance of copper containing stainless steel and its related mechanism were studied. The following means of analysis and characterization were used: double cyclic potentiodynamic repolarization. The corrosion resistance of materials under different heat treatment conditions was analyzed by potentiodynamic polarization and electrostatic potential polarization. The precipitation phase and optical microscope of the aging process of copper-containing stainless steel were analyzed by transmission electron microscope (TEM) and 3D atomic probe. The surface corrosion morphology of the material was analyzed by laser confocal microscopy. The experimental results showed that the aging temperature of grain boundary sensitization of 304L stainless steel containing copper was 735 鈩，

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