松香胺聚氧乙烯酸对A3钢在盐酸介质中缓蚀性能的研究

采用失重法及电化学方法测定松香胺聚氧乙烯醚化合物（以下简称ＲＡ）在盐酸溶液中对Ａ３钢的缓蚀性能，研究了温度、浓度等因素对ＲＡ缓蚀性能的影响。实验结果表明，ＲＡ分子中的环氧乙烷基的含量不同，缓蚀性能也不一样，其大小顺序为１０ＲＡ＞１５ＲＡ＞５ＲＡ，并发现ＲＡ与乌洛托品、甲醛、丙炔醇、碘化钾等有很好的协同作用。文中还计算了ＲＡ的反应表观活化能，对其缓蚀机理进行了探讨。     

青岛石大卓越股份有限公司研制成功醇燃料金属腐蚀抑制剂

一种用于控制含醇燃料腐蚀作用的醇燃料金属腐蚀抑制剂日前在青岛石大卓越股份有限公司研制成功,并在工业装置上试生产出了第一批合格产品。 醇燃料金属腐蚀抑制剂是该公司研究人员,跟踪国外技术动向,针对国内醇燃料的使用现状,自主研制开发的一     

柔性阳极在葡北油库外输管线上的应用

1.概述 金属的腐蚀是一种自然现象,它的发生是一种电化学过程。因腐蚀造成的损失相当严重,因此腐蚀的防护方法研究也很重要。目前腐蚀的防护方法主要包括涂层保护和电化学保护或两者联合保护。电化学保护又分阴极保护和阳极保护,目前防腐主要是采用阴极保护方法。阴极保护方法是在金属表面上通入足够大的电流,使金属电位变负从而避免金属腐蚀。阴极保护又分为外加电流阴极保护和牺牲阳极阴极保护,对于区域性阴极保护,目前国内普遍采用外加电流的方法。由于区域性阴极保护中情况较为复杂,管道容器比较多,给实施阴极保护     

基于像素差异的金属腐蚀区域分割仿真研究

研究基于图像的金属腐蚀区域分割问题,提高分割区域的准确性。针对传统基于金属本身与腐蚀颜色的区别,利用像素差异的变化进行腐蚀区域的分割,因当腐蚀颜色与金属的本体颜色相差不是很大,或者在边沿发生像素的混淆时,利用差异边缘像素相减的方法很难完整分割腐蚀区域的问题。为了解决上述问题,提出利用空间像素差异距离聚类的金属腐蚀区域图像分割算法。通过计算差异像素之间的差异距离概率,将差异像素特征进行严格划分,对划分后的结果进行排序计算,详细描述混淆边沿信息,对腐蚀区域进行完整分割。实验证明,改进方法能够对金属腐蚀造成的细微区域完整分割,取得了满意的效果,为金属腐蚀区检测提供了参考。     

常温发黑工艺及影响质量因素

介绍了H-845常温发黑工艺及前处理方法,并分析了影响发黑质量的种种因素     

Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion

The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH...     

本刊编委 李新立

李新立，男，1963年生，汉族。1983年湖南大学金属腐蚀与防护专业毕业，获学士学位。1987年机械科学研究院金属腐蚀专业研究生毕业，获硕士学位。1987年起在武汉材料保护研究所工作，1996年任研究员。现任武汉材料保护研究所副所长。     

Improvement of corrosion resistance of AZ91D magnesium alloy by gadolinium addition

Based on the previous investigation on beneficial introduction of holmium into magnesium alloy, the effect of gadolinium, an adjacent rare earth element, on corrosion resistance was examined. The corrosion behavior of two Mg-9Al-Gd alloys （Mg-9Al-0.45Gd and Mg-9Al-l.43Gd） was evaluated and compared with that of Mg-9Al alloy without Gd by means of specimen mass loss and hydrogen evolution in 3.5% NaCl solution saturated with Mg（OH）2. The Gd-containing alloys exhibit enhanced corrosion resistance with respect to the plain Mg-9Al alloy. The microstructures of Mg-9Al alloy and Mg-9Al-0.45 Gd alloy were observed by electron probe microanalysis （EPMA） and energy dispersion spectroscopy （EDS）. The alloys with Gd addition show a microstructure characterized by a phase solid solution, surrounded by minor amount of β phase and more grain-like Gd-containing phase. To illustrate the involved mechanism their polarization curves were recorded. The electrochemical investigations reveal that Gd addition shifts the corrosion potential of the alloy towards active, as Gd containing phase is more active and hence less cathodic. As a result, the micro-galvanic corrosion is suppressed. Moreover corrosion product films formed on the Gd containing alloys are more compact and provide a better protective effectiveness than that on the alloy without Gd against corrosion. Repassivation measurements in mixture solution of 0.21 mol/L K2CrO4＋0.6 mol/L NaCI also verify the beneficial role of Gd addition. Based on the present preliminary analysis, both the deposited Gd-containing phases and corrosion product films are believed to be responsible for the improved corrosion behaviour due to Gd addition.     

Novel accelerated corrosion test for LY 12CZ and LC4CS aluminum alloys

A new accelerated corrosion test--comprehensive environmental test （CET） was developed in order to estimate the outdoor corrosion of aluminum alloys in marine environment. The environmental characteristics in CET were studied by atmospheric corrosion monitor （ACM）, and the morphology of corrosion product was observed by SEM. The correlation between the accelerated corrosion tests and outdoor exposure was discussed. The results show that the anti-corrosion ranking for LY12CZ, LC4CS, clad LY12CZ, and clad LC4CS in CET is the same as that of the alloys exposed outdoor, and ACM study shows that CET demonstrates the .same environmental characteristics as that exposed outdoor. CET is a more accurate accelerated corrosion test, and a mathematical relation was obtained to describe the relation between CET and outdoor test.