W—311^#耐腐蚀SMC树脂的开发研究

本文介绍了Ｗ－３１１＾＃ＳＭＣ不饱和聚酯树脂的研制及制品耐水、耐腐蚀性能。实际应用表明，该树脂适合ＳＭＣ成型工艺要求，为优良的耐腐蚀ＳＭＣ树脂。     

AN EXPERIMENTAL INVESTIGATION OF THE GROWTH OF SMALL CORNER FATIGUE CRACKS IN ALUMINIUM 6061-T651

Results of an experimental investigation of the fatigue growth of small corner cracks emanating from small flaws are presented. Growth-arrest behaviour was observed, and increases in crack length during growth periods were of the order of the transverse grain size. For the test material, the corner crack front intersects, on average, only three–six grains in the small crack regime monitored, so only a small number of constrained, interior grains is encountered. It is suggested that the presence of partially constrained surface grains may contribute to the 'anomalous' growth behaviour which has been observed by a number of investigators.
The crack growth histories of the test data presented exhibit considerable scatter. It is shown that a Student's t -test can be used to estimate confidence intervals in order to provide a measure of the observed scatter. The variation in confidence intervals in the transition from small to long fatigue crack growth is discussed.     

Measuring the likelihood of VR visual fatigue through ocular biomechanics

Immersion in virtual reality is still linked to symptoms of visual fatigue such as eye strain, dizziness, and overall discomfort. Studies have investigated visual fatigue through pre- and post-immersion tests of the visual function. In this work, we extend on our previous study and derive a visual fatigue likelihood metric using biomechanical analysis. Previously, we have investigated the effect of VR on the vergence system during immersion. The proposed visual fatigue metric exhibited a significant correlation to vergence angle variability which was previously linked to vergence accommodation conflict in VR. We also discuss subjective feedback and its relationship with the proposed visual fatigue metric.     

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。     

Effect of atmospheric pollutants on the corrosion of high power electrical conductors: Part 1. Aluminium and AA6201 alloy

The aim of this study was to evaluate the joint effect of marine and industrial pollutants on the atmospheric corrosion of aluminium and its AA6201 alloy. Weight loss was determined after 4, 11, 16 and 24 months exposure being morphology and attack intensity analysed through SEM-EDX. Both materials showed the most intense attack for the highest SO₂ contents. Good correlation among weight loss, attack depth and tensile strength to rupture with time and with pollutant contents was determined for both materials in most sites. The cause for low aggressiveness of the heaviest Cl⁻ polluted atmosphere on aluminium was electrochemically demonstrated.     

岛上原油贮罐罐底边缘板腐蚀机理分析及防护措施

对马鞭洲岛广石化码头原油罐罐底边缘板腐蚀机理进行分析，并采取相应的防护措施。实践表明，对提高码头原油贮罐的安全使用寿命是有效的。     

Inhibition behavior for copper corrosion by photoelectrochemical methods

wavelengthofmono chromatelightwas 4 2 0nm .3　RESULTSANDDISCUSSION3.1　ApplicationofphotoelectrochemicalmethodtoevaluatetheeffectsofinhibitorsforcoppercorrosionThestructuresoftheinhibitorsforcoppercorro sionshownintextareasfollows:Theinhibitioneffectsofdifferentinhibitorsforcoppercorrosioncanbeevaluatedby photoelec trochemicalmethod .AsshowninRef .[12 ],onanegativepotentialscan ,thepotentialcorrespondingtothecathodicphotocurrentJph=0isdefinedasΦV,atwhichCu2 Oontheelectrodesurfaceisc…     

Effects of SO2 and SO3 on the Na2SO4 induced corrosion of nickel

The effects of SO₂ and SO₃ in the environment on the hot corrosion behavior of Ni in the temperature range 750–950°C has been studied. Below the melting point of Na₂SO₄ (884°C), rapid corrosion takes place by formation of a Na₂SO₄-NiSO₄ melt, which can penetrate the porous oxide scale and give rise to sulfide information by coming in contact with the metal. The distribution of the sulfides depends on the SO₂ level in the ambient gas. Continued corrosion occurs by a sulfidation-oxidation mechanism. At temperatures above the melting point of Na₂SO₄, accelerated degradation occurs via dissolution of the surface scale, followed by reprecipitation of the oxide in a nonprotective form.Deceased     

新型铸造镁合金开发现状

总结了近年来镁合金在高温抗蠕变、高韧性、高强度、高耐蚀性、降低成本和改善工艺性六大热点研究方向上取得的典型研究成果，重点阐述了对高温抗蠕变铸造镁合金的研究。并从热力学角度分析了镁合金中可能出现的各相对镁合金高温蠕变过程的影响，叙述了Mg-Al、Mg-Zn和Mg-RE系耐热合金的最新发明。