镁合金复合镀层结构和耐腐蚀性能研究

采用微弧氧化和磁控溅射复合技术在镁合金表面制备高硬度镀层。通过X衍射仪、扫描电镜、测厚仪和电化学工作站等分析手段对镀层的组织结构和性能进行研究。结果表明,镀层由MgO、MgSiO 3、CrN和Cr 2N等物相组成,自腐蚀电位从-1.69 V上升到了-0.9 V,极化电阻从3.4×10^3 ohm·cm 2增加到了4.6×10^5 ohm·cm ^2,腐蚀电流密度从1.2×10^-5 A/cm^ 2降低至8.2×10^-8 A/cm ^2,耐腐蚀性能得到了显著提高。     

Influence of Hydrogen on Impact strength and Microstrcture of the Titanium Alloy Ti-Al-V

Absract:After analyzed and tested the composition, microstructure and the mechanical property for the forging timber of the titanium alloy Ti-Al-V, Processed it into lash test samples , and made the samples having different hydrgen-content by the way of artificial hydrogen-absorption. Next, measured the impact strength vaules(ak ) of the titanium alloy in different hydrogen-content, and drawn the relation curve between the impact strength and the hydrogen-content. Afertwards,four samples and themselves impact fractographies whose hydrogen-contents are 48ppm,137ppm, 361ppm and 666ppm have been used for phases and the sweep electorn microscopes,Known microstructures and shapes of the hydrogenate of the different hydrogen-content tianium alloy and that the hydrogenate is sheet and its distribution in the titanium alloy.     

铝合金门窗施工中应注意的几个问题

本文着重对铝合金门窗施工前的准备工作,现场安装的顺序,吊线检查、防护情况等进行了简单的阐述,并提出了自己的意见。     

Fe-B合金化学沉积的影响因素分析

通过化学沉积法制备Fe-B化学镀层,用电化学方法分析了偶接铝、镀液组分和沉积工艺对Fe-B化学沉积行为的影响.结果表明,偶接铝使体系的沉积电位负移,降低了Fe-B合金化学沉积的极化阻力,特别是金属离子还原的极化阻力,从而诱导Fe-B的化学沉积.镀层的沉积速率依赖于镀液组分和沉积工艺.     

YG6拉丝模渗硼的试验研究

对YG6硬质合金拉丝模进行了固体粉末渗硼试验，结果一，不同渗硼温度和时间对渗硼层硬度影响不大，经950℃，5h固体粉末渗硼后，可获得40μm厚的Co2B单相渗硼层，表面硬度（HV）提高90－100，使拉丝模寿命提高5倍以上。     

用于某种电动客车的铝合金榫卯节点疲劳性能研究

针对铝合金电动中巴客车行驶环境中榫卯结构的疲劳强度问题,以铝合金榫卯节点为研究对象开展三点弯曲疲劳试验,研究铝合金榫卯节点疲劳性能。研究结果表明,榫卯节点裂纹萌生寿命位于总寿命的10%~20%区间。根据寿命曲线预估,每降低一个载荷等级,榫卯节点疲劳寿命约是前一载荷等级的2倍。疲劳破坏先是卯梁上翼缘受到挤压开始萌生裂纹,接着节点周围焊缝处产生新的裂纹,随着变形量增大,样件最后断裂失稳。     

ADC12铝合金箱体件的质量改进

简要介绍了ADC12铝合金薄壁箱体件的质量改进措施。     

Idling noise from circular saws made of metals with different damping capacities

Circular saw construction using materials with high internal damping has been found to be an effective way to suppress whistling noise during saw idling. A high-damping alloy called Silentalloy (12Cr-3Al-Fe) was previously shown to be an effective material for this purpose. Tests with Silentalloy suggested that a logarithmic decrement of at least 0.07 is needed. Silentalloy does have some disadvantages, such as modest strength, difficult heat treatability, and special order status. The purpose of these experiments was to confirm the general applicability of the minimum effective logarithmic decrement of 0.07 and to find more practical metals for saw-blade construction. Three commercially available metals of different damping capacity were selected. The idling noises of saws made of these metals were compared with those of saws made of typical saw steel and Silentalloy. The minimum logarithmic decrement for whistling-noise suppression was found to be approximately 0.01. On a logarithmic scale, this value is similar to the 0.07 value previously found for a Silentalloy saw. A ferromagnetic steel (20Cr-3A1-Fe) was found to be a useful alternative to Silentalloy from the viewpoint of strength, but the cost of this steel makes it unsuitable for mass production. The success in identifying an effective alternative material to Silentalloy provides encouragement for the identification of other high-damping alloys among the 13Cr-Fe to 18Cr-Fe series without the cost disadvantage of ferromagnetic steel.     

硝酸法处理废钨铜合金回收钨和铜新方法

对采用硝酸法从废钨铜合金中回收金属钨和铜，以及转化有害的氮氧化物的方法进行了探讨．并设计了数种较小规模的回收装置．经实验表明，本法具有操作简便、投资省、能耗低、污染小等特点，具有一定的实用价值．