电镀锌层白色腐蚀现象的腐蚀机理

着重从理论角度对电镀锌层在不同环境中产生白色腐蚀产物现象的腐蚀机理进行了论述,并说明了电镀锌层产生白色腐蚀现象是电镀锌层在不同环境中产生腐蚀的必然结果。     

铜—镍—铬镀层脱皮起泡的原因

一、前言电镀层脱皮或起泡的疵病是工艺上的老大难问题,在多种常见故障以脱皮、起泡、毛刺、针孔、露黄、烧黑以及光泽不均等故障中,以脱皮、起泡的疵病最为多见,影响产品的使用寿命,由此造成的经济损失也很大,自行车电镀件尤其是车圈的脱皮、起泡更是个常见     

镀锌层银盐黑色钝化工艺

在含ＡｇＮＯ３０．５～１ｇ／Ｌ，ＣｒＯ３５～１０ｇ／Ｌ，Ｈ２ＳＯ４０．５～１ｍｌ／Ｌ，光泽控制剂１０～２５ｍＬ／Ｌ的钝化液中处理镀锌层，可获得结合力良好、光亮的黑色钝化膜。     

崩落区回填的生产实践

本文就丰山铜矿无底柱分段崩落法及覆盖层的形成过程进行了介绍，分析了在丰山特定条件下利用露天剥离废石回填崩落区的原因和效果，对回填厚度及其对崩落范围，巷道稳定性影响进行了探讨。     

崩落区回填的生产实践

本文就丰山铜矿无底柱分段崩落法及覆盖层的形成过程进行了介绍，分析了在丰山特定条件下利用露天剥离废石回填崩落区的原因和效果，对回填厚度及其对崩落范围，巷道稳定性影响进行了探讨。     

提高小折射资料解释效率的几种方法

折射法在石油地震勘探中常用于低降速层厚度、速度的测定。常用的厚度计算方法较繁琐，易出错。这里介绍几种用折射法快速求取地层厚度的方法。方法介绍为了下面叙述方便，这里先给出临界距离法（Xc法）和截距时间法（To法）的厚度公式（1）临界距离法（2）截距时间法f述公式中：i为临界角；sini；。一见／V。；sini。。一V。／V。；…。手工来取低降速层厚度的快速方法这里介绍两种求取低降速层厚度方法——T近似法和图表法。T。近似法几近似法的数学式推导为令X。一t。；V；，当v。远大于风时，可以认为图l给出了几近似法的图解，图2…     

Effect of Thickness on the Structure and Tribological Properties of MoSx Coating

MoSx coatings were prepared by bipolar-pulse DC unbalanced magnetron-sputtering system with the variation of coating thickness at different Ar pressures.The composition and surface morphology were determined by using energy dispersive X-ray and scanning electron microscopy;the structural characterization was analyzed by X-ray diffraction.The friction and wear properties were investigated by fretting tests in air with less than 10% and 50% relative humidity.At 0.40 Pa pressure,(002) basal plane orientation was formed throughout the coatings.At 0.88 Pa and 1.60 Pa pressures,(002) basal plane orientation was only noticed in the first stage of coating growth(around 0.20 μm in thickness), and then edge orientations with their basal planes perpendicular to the surface would be evolved in the coatings.Humidity has a minor influence on the coatings that have(002) basal plane orientation,whereas the tribological properties of MoSx coatings with edge orientations are greatly affected by humidity.The mechanisms of coating growth and friction and wear processes are discussed.