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A new environmental friendly cutting brass containing stibium instead of lead was produced by casting and rolling. The microstructure was observed and the mechanical, dezincification and cutting properties were studied. The results show that the white particles distribute in both grains and grain boundaries, and the particles are mainly intermetallics containing stibium. The tensile strength, yield strength and elongation percentage of half-hard Sb-brass is 461.72 MPa, 213.3 MPa and 15.67%, respectively. Corresponding to HPb59-1 by the size as well as appearance of the chips and the mechanism of free-cutting, the cutting property of unleaded free-cutting Sb-brass is excellent. The unleaded Sb-brass has excellent dezincification corrosion resistance, and the average depth of longitudinal section is about 295.4 μm, while the average depth of lateral section is about 214.7 μm, and it is feasible to develop a new unleaded free-cutting Sb-brass. 相似文献
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采用金相试验、扫描电镜试验、硬度试验和双环电化学动电位再活化法(DL-EPR)试验等方法,研究不同的固溶处理温度对冷弯TP347H钢管组织和性能的影响。结果表明,TP347H钢管经过冷弯变形后,晶内有大量的滑移线出现,硬度超出标准许可范围,抗晶间腐蚀能力降低。经固溶处理后,滑移线和第二相减少,硬度降低。固溶处理温度对弯管的抗晶间腐蚀能力影响很大,从1050℃到1150℃,弯管的抗晶间腐蚀能力先变强,在1 100℃达到峰值,然后变弱。TP347H的最佳固溶处理温度为1 100℃。 相似文献
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架空输电线路金具腐蚀分析及防护对策 总被引:2,自引:0,他引:2
架空输电线路金具的腐蚀速度一般较快,且位于高空不便维护.为此,以广西、湖南地区架空输电线路金具腐蚀为例,通过宏观形貌检查、力学性能实验、X衍射物相分析、电子显微分析、电化学测试和镀锌层厚度测量,分析金具的腐蚀机理和规律,提出了有针对性的金具腐蚀防护对策.分析结果表明:金具腐蚀引发截面尺寸减小、抗拉强度降低、材质变脆这3种失效形式;硫是促进金具腐蚀的关键因素,拉应力和微动摩擦也加剧了金具的腐蚀.因此,在腐蚀较重的工业区,为保障电网运行安全,金具应采取加强防腐措施,镀锌厚度宜增加到192 μm以上. 相似文献