Ni3Al材料在O2／SO2／SO3气氛中的低温热腐蚀行为

用涂盐法并借助扫描电镜、光谱分析、金相、电子探针及Ｘ射线衍射等技术研究了Ｎｉ３Ａｌ金属间化合物在Ｏ２／ＳＯ２／ＳＯ３气氛中６００－８００℃温度范围内（Ｎａ，Ｋ）２ＳＯ４引起的低温热腐蚀行为。结果表明，Ｎｉ３Ａｌ发生了低温热腐蚀，其腐蚀速度在７５０℃呈现一最大值。热腐蚀的发生主要归因于多元共晶盐的形成。盐沉积加速了材料在空气中的氧化。ＣｏＣｒＡｌＹ涂层能改善合金的耐蚀性能。     

挤压后硼酸铝晶须增强铝复合材料表面的腐蚀特征

利用原于力显微镜观察了挤压态Al18B4O33 w／pure Al复合材料早期腐蚀过程中表面形貌的变化特征．研究了沿与挤压方向成不同角度截取的Al18B4O33 w／pure Al复合材料在3．5％NaCl溶液中的腐蚀规律．结果表明：晶须与基体的界面是腐蚀易于发生的地方．点蚀首先在晶须的端部产生，随后沿着晶须与基体的界面扩展．挤压后沿与挤压方向成不同角度截取的Al18B4O33 w／pure Al复合材料表面腐蚀坑的深度存在差别．     

Electrochemical corrosion characteristics of ZrNi5−xCox alloys

The electrochemical corrosion behaviour of a series of ZrNi_5−xCo_x alloys with x=0-4 has been tested using potentiokinetic polarisation technique. The polarisation curves were measured in deaerated 0.5 M sulphate solutions with pH=0.2-7 and in strong alkaline solution of KOH (pH=15). It is shown that the presence of greater amounts of Co in the alloy (x?2) worsens the passivating properties of the alloy in acidified sulphate solutions. On the other hand, in strong alkaline solutions, both low- and high-cobalt alloys undergo stable passivation. The degree of Ni substitution by Co in the alloys does not generally affect the shape of cathodic polarisation curves.     

高耐蚀性热镀锌板的钝化处理工艺探讨

介绍了热镀锌板钝化膜的形成机理 ;针对攀钢热镀锌板出现白锈、黑斑等问题 ,分析了钝化液pH值、添加剂及操作条件对钝化膜质量的影响 ,同时提出了改进热镀锌板耐蚀性能的措施     

6063铝合金型材表面麻点的成因及解决方法

通过生产实践与试验分析,找出6063铝合金型材产生麻点缺陷的各种原因,提出了避免和减轻这一缺陷的方法。     

固溶后预析出对7A55铝合金力学及腐蚀性能的影响

采用硬度测试、电导率测试及透射电镜观察，研究固溶后降温至440℃预析出处理时间对7A55铝合金板材力学和腐蚀性能的影响。结果表明：随预析出处理时间的延长，基体析出相逐渐增多且长大，导致合金时效后硬度和强度先提高而后降低；晶界析出相逐渐长大，晶界无沉淀析出带宽化，晶界相不连续性先提高而后降低，导致合金抗晶问腐蚀和剥落腐蚀性能也先升高而后降低。     

动态与静态纯腐蚀对定量研究材料冲刷腐蚀交互作用的影响

分别测定了不锈钢和碳钢静态与动态纯腐蚀失重率、冲刷腐蚀失重及其电化学行为。研究了静态与动态纯腐蚀失重率对材料冲刷腐蚀交互作用失重率的影响。实验表明：（1）动态纯腐蚀比静态纯腐蚀更能反映材料在液固两相流中冲刷腐蚀交互作用的本质；（2）本实验条件下。T8钢动态纯腐蚀失重率是静态纯腐蚀失重率的2倍以上。18－8不锈钢动态纯腐蚀失重率竟是静态纯腐蚀失重率200倍以上、静态交互作用失重是动态交互作用失重率的2倍以上。可见静态与动态纯腐蚀对定量研究材料冲刷腐蚀交互作用会产生很大的差异；（3）在腐蚀性浆料中，首先要保证材料具有一定的耐蚀性。其次再考虑提高材料的硬度和耐磨性。这样才能有效地提高材料的耐冲刷腐蚀性能。对不同的工况，必须同时兼顾材料的耐蚀性和耐磨性。     

Breakdown of passive film on nickel in borate solutions containing halide anions

The effect of Cl⁻, Br⁻ and I⁻ anions as aggressive agents on the anodic behaviour of nickel electrode in deaerated Na₂B₄O₇ solutions have been investigated by galvanostatic polarization technique. Lower concentrations of the halide anions have no effect on the mechanism of nickel passivation. An increase in the halide anions concentration causes oscillation of the potential in the oxygen evolution region. This could be attributed to the destruction of the passivity by halide anions and repassivation of the film by anodic current and/or OH⁻ anions. Higher aggressive anion concentrations cause breakdown of the passive film and initiated pitting corrosion. As the temperature increases, the breakdown potential is shifted towards the more negative direction. On the other hand, as the pH of the solution increases, the breakdown potential is shifted toward more positive direction, indicating increased protection of the passive film. The activation energy, , of the oxide film formation in the presence of Cl⁻ anions was calculated and was found to be 21 kJ/mol.     

Corrosion protection of AA 2024-T3 by bis-[3-(triethoxysilyl)propyl]tetrasulfide in neutral sodium chloride solution. Part 1: corrosion of AA 2024-T3

This study consists of two parts. In the first part, the corrosion of 2024-T3 aluminum alloy (AA 2024-T3) was studied using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results showed that the anodic S phase (Al₂CuMg) particles dealloyed Al and Mg during the 3.5 h of immersion in a neutral 0.6 M sodium chloride (NaCl) solution; with the dealloying of Mg being the most severe. Simultaneously, a heavy dissolution was also observed for the surrounding Al matrix of the S phase particles. This Al dissolution is likely to be caused by a local alkalization resulting from the coupled cathodic reaction (water and/or oxygen reduction). Such corrosion in AA 2024-T3, however, can be inhibited efficiently after the treatment of bis-[3-(triethoxysilyl)propyl]tetrasulfide (bis-sulfur silane). The associated studies on bis-sulfur silane treated AA 2024-T3 will be presented in the second part.     

流动腐蚀研究的新进展

阐述了流动腐蚀的复杂性与分类.综述了电化学阻抗 谱和激光多谱勒测速等新技术在流动腐蚀研究过程中应用所形成的新的流动腐蚀实验研究方 法和测试技术，论述了流动腐蚀机理研究和数值计算法在流动腐蚀研究中的应用的一些最新 进展.最后，提出了流动腐蚀研究中的几个问题.