Anodic Films on Aluminium and its Alloys for Protection against Corrosion

The effect of periodic reversal of current upon concentration over-potential and current efficiencies in electrolysis has been investigated for a metal depositon reaction which is purely diffusion-controlled. In the cathodic part of the cycle the onset of limiting diffusion conditions is deferred, and the current efficiency and average rate of metal deposition are increased. The magnitude of the effect depends upon the ratio of the quantities of electricity passed in anodic and cathodic pulses, and it is greatest under conditions such that diffusion away from the electrode of anodically-formed ions is minimised. Quantitative theoretical treatment is possible in a limiting case to which actual experimental results approximate. Supplementary experiments have been carried out in more complex cases of metal deposition.     

控制系统的腐蚀与防护

分析了影响集散控制系统腐蚀的环境因素,并提出以电子元器件为核心的控制系统的防腐蚀措施.     

Anodic Dissolution and Selective Corrosion of Alloys

The mechanisms of the anodic dissolution of alloys are considered. The kinetic explanation of an abrupt increase in the corrosion resistance of the alloys, formed by metallic systems with a continuous series of solid solutions, is given. The dezincification of brasses related to the reduction of the oxidation products of copper is accounted for by the chemical conjugation of the partial ionization reactions of zinc and copper. The former reaction transmits a part of the free energy to the latter one via vacancies. As a result, the ionization of copper becomes possible at the potentials below the equilibrium potential of the individual copper. For the same reason, the oxidized copper can reduce at the brass surface to the individual copper phase. The mechanisms of the dissolution of intermetallides, used for obtaining skeleton catalysts, are discussed.     

Numerical Simulation of the Anodic Protection Starting Conditions

A mathematical model of the electric field under starting conditions of anodic protection is considered. An empirical formula of the dependence of current density on the polarization value and potential growth rate is proposed to describe anodic polarization curves. The numerical parameters in the formula are determined from experimental data. In three- and two-dimensional systems, the problem is solved by a boundary elements method. Presented are the calculation results for the regime of starting the anodic protection of a cylindrical steel container partly filled with a sulfuric acid solution.     

Centre for Protection Against Corrosion

Abstract

A graphical method is described for calculating the instantaneous corrosion rate and anodic and cathodic. Tafel slopes from the cathodic polarisation curve. Unlike other methods, which use a portion only of the polarisation curve, the method suggested uses the cathodic polarisation as a whole. Examples have been given to show that this method can be used to obtain the corrosion parameters readily, and with reasonable accuracy.     

金属的腐蚀与防护

金属腐蚀，是金属和周围介质接触时由于发生化学和电化学作用而引起的破坏作用。从热力学观点看，除了少数贵金属(如金、铂)外，各种金属都有转变成离子的趋势，就是说金属腐蚀是自发的普遍存在的现象。金属被腐蚀后，在外形、色泽以及机械性能方面都将发生变化，造成设备破坏、管道泄漏、产品污染，酿成燃烧或爆炸等恶性事故以及资源和能源的严重浪费，     

航空材料腐蚀疲劳研究进展

腐蚀疲劳是航空材料重要的损伤机理之一,对腐蚀疲劳寿命的预测可以有效地预防航空材料的疲劳损伤.本文依据腐蚀疲劳机理,总结了主要的腐蚀疲劳预测模型,并展望了航空材料腐蚀疲劳研究的方向.     

腐蚀机理与腐蚀防护

本文论述了腐蚀的产生机理，从而探讨了防腐蚀的办法。     

石墨烯基防腐涂层研究进展

自石墨烯发现以来,其优异的导电性、力学性能、热导性、光学性能等吸引了研究学者的广泛关注。此外,石墨烯稳定的sp2杂化结构使其自身具有良好的化学惰性、抗氧化能力和抗渗透性,被认为是一种理想的防腐材料,在金属材料的防腐领域具有非常大的应用前景。基于此,综述了石墨烯防护薄膜和石墨烯/有机涂层在金属腐蚀防护领域的研究进展,并从分散角度阐述了石墨烯的功能化对有机涂层防腐性能的影响;同时归纳了石墨烯的高导电性对有机涂层防护性能的影响以及防护机理。最后展望了石墨烯薄膜和石墨烯有机涂层在金属腐蚀防护应用方面面临的一系列难题以及发展方向。     

氯化钾转化地面的腐蚀与防护

分析了氯化钾低温转化法生产硫基NPK复合肥转化地面的腐蚀机理，并提出了相应的防护措施。     

从腐蚀控制中寻找财富--就腐蚀控制与专家对话

腐蚀控制作为一个新兴的产业，已显示出它强劲的发展势头。针对我国腐蚀控制行业的现状，亟待解决的是整顿和整合从事防腐蚀工作的社会力量，使之健康发展。中国防腐蚀技术协会本着扶优扶强的原则，在2003年向国内外推出一批中国优秀防腐蚀企业和企业家。全面展示中国在腐蚀控制技术方面取得的成果以及企业的实力和行业的整体风貌，为腐蚀控制产业的成长推波助澜。     

海底管道腐蚀与防护措施研究现状

海底管道是海上油气集输的主要载体,是海上油气田开发的生命线。腐蚀是影响海底管道可靠性及其使用寿命的关键因素,对海底管道采取有效防腐蚀措施是保障其正常运行的必要措施。本文主要分析了海底管道的腐蚀原因,论述了海底管道腐蚀防护的研究现状。     

接地网材料的腐蚀及其防护发展

接地网材料在土壤中的腐蚀是电力、电气设备发生故障的关键原因。本文讨论了影响材料土壤腐蚀的重要影响因素,介绍了常用金属材料的土壤腐蚀行为以及接地极材料的腐蚀特性,综述了接地网材料腐蚀防护研究的进展。     

腐蚀与防护专家系统简介

简要介绍了腐蚀与防护的基本问题、建立腐蚀与防护专家系统的目的以及腐蚀与防护专家系统的发展及现状;着重介绍了腐蚀损伤评价专家系统、腐蚀失效模式诊断及预测专家系统和炼油设备腐蚀与防护管理规范化专家系统等三个腐蚀与防护专家系统.     

海上油气田钢结构物腐蚀及防护技术

本文概括了海洋油田平台钢结构物不同区域的腐蚀环境和腐蚀特点。针对海洋油田固定式生产平台钢结构的防腐保护要求,就海洋平台钢结构大气区,飞溅区和全浸区的防腐防护技术进行了探讨。     

变电站接地网腐蚀与防护技术进展

在变电站接地腐蚀调研的基础上,对接地网腐蚀机理和评估方法进行了探讨。阐述总结了国内外关于接地网腐蚀的研究进展,并提出了接地装置腐蚀的防护措施。     

钛合金阳极氧化膜在Hank''''s溶液中的腐蚀行为

利用扫描电镜(SEM)和恒电位阶跃法，研究了不同工艺条件下得到的钛合金(TC4)阳极氧化膜在Hank’s模拟体液中的耐蚀性。分析了不同电解液组成、电解液温度及阳极氧化时间对其耐蚀性的影响。结果表明在磷酸溶液中生成的氧化膜耐蚀性较好，此外电解液的温度、极化时间对膜层耐蚀性也有显著影响。     

北大桥钢结构桥梁腐蚀防护

钢结构采用合理的涂装配套方案一长效重防腐涂装及复涂工艺是提高钢结构防腐能力的有效途径。钢梁的防腐效果是和钢梁表面处理．涂装配套、施工质量等诸多因素密切相关．