Cathodic arc deposition technology

Cathodic arc deposition is a unique technology. An arc spot on a cathode generates a plasma consisting of cathode material with a high degree of ionization. The high concentration of ions allows control of film morphology, high adhesion, efficient reactive deposition of compounds and uniform deposition over a variety of shapes. The composition of the alloys is generally retained from source to substrate. Deposition rates cover a wide range from nanometers per minute to tens of micrometers per minute. Many aspects of the technology warrant further study and its applications are only just beginning.     

阴极电泳涂料进展

纵观阴极电泳涂装的发展史,在综述阳离子型树脂的合成方法和阴极电泳涂料的基本组成之后,指出今后阴极电泳涂料将向中厚膜、厚膜、高光泽、高充填性、高平整性、高边棱覆盖及低温固化等方向发展。     

浅谈3层PE管道阴极保护电位对防腐层阴极剥离的影响

国内外标准规范对阴极保护电位规定了最小电位准则,但没有设定最大电位准则.本文通过对阴极剥离原理的分析,阐述了3层PE管道阴极剥离产生的条件,通过实验验证了阴极保护电位与阴极剥离的关系,最后对通电电位的设置提出了几点看法.     

Cathodic protection of water-line areas

Abstract

The effect of cathodic protection on intermittently immersed water-line areas has been studied. Corrosion was greatly reduced in sea water compared with that in sodium chloride solution, and the degree of protection was greater at higher frequencies of immersion. The protective effect of cathodically deposited ‘chalk’ is discussed. No corrosion occurred at a static water-line in sodium chloride solution.     

阴极保护用阳极

介绍了牺牲阳极材料中镁基、锌基、铝基阳极的化学成分和性能特点，以及多种外加电流阴极保护用阳极材料的特点。通过对石墨阳极、高硅铸铁阳极和铅银合金阳极、镀铂阳极和混合金属氧化物阳极的性能比较，认为混合金属氧化物阳极是最为理想和最有前途的辅助阳极材料。     

Cathodic phenomena in aluminum electrowinning

Although aluminum is one of the world’s highest production-volume primary metals, it is particularly costly to produce for a variety of factors, not the least of which are the expenses associated with electrolytic reduction. Based on the scale of global aluminum processing, even minor improvements in the electrowinning technology can result in significant savings of resources. Thus, from this perspective, the following reviews recent studies of cathodic phenomena in aluminum electrowinning.     

阴极保护和参比电极

在防腐和阴极保护领域中，参比电极是最普通且不可缺少的工具和设施之一。但是在实际应用中，对其尚有很多的认识不足和误区，影响着管理水平、维护和维修的质量。本文结合实际讨论了有关问题，提出了应用中应注意的事项。     

外加电流阴极保护辅助阳极

埋设于地下或水中钢铁结构的腐蚀问题是一个世界性的难题,对我们每个人都息息相关,对这些钢结构实施外加电流阴极保护是目前国内主要的保护措施。然而直至现在,可以给腐蚀工程师应用的阳极都不是尽善尽美,他们很难在重量、安装控制、使用寿命及成本上找到一个折中的方案。LIDA混合金属氧化物阳极经过多年研究,成功地解决了这些问题。它们效费比高,易于安装,是一种值得信赖的选择。     

Cathodic polarization of commercially pure aluminium

Cathodic corrosion, particularly alkaline pitting and repassivation, of 1S aluminium has been investigated by potential-controlled methods in unbuffered chloride media. The results are mainly for de-aerated solutions; the influence of dissolved oxygen and stirring, which are likely to be present in a practical situation, are also discussed. The metal undergoes stable pitting and then uniform etching as the applied potential is decreased below ? 1.35 V(SCE). At potentials more positive than this threshold value, metal dissolution still occurs possibly near the cathodic impurities on the surface due to local alkalinization resulting from hydrogen evolution; but, the surface repassivates slowly as the cathodic sites are covered up by the oxide film. The polarization behaviour of the partially passive surface is studied by fast-scan potential measurements and is associated with hydrogen evolution kinetics. The measured current decays exponentially with time during repassivation at constant potential. This is explained in terms of a model based on film growth controlled by metal dissolution.     

外加电流阴极保护用阳极

阴极保护用阳极分为牺牲性阳极和外加电流阳极。本文介绍外加电流保护用阳极材料和主要的阳极反应。通过石墨、Si-Cr-Fe、铂化钛/铌阳极和混合金属氧化物阳极的性能对比,认为混合金属氧化物是有前途的阴极保护用阳极材料。