黎蒴栲/PVC复合材料耐土壤腐蚀性的研究

选择了苯并三唑、受阻胺、氧化锌、酞菁绿、二氧化钛和UV300等七种光稳定剂制备黎蒴栲/PVC复合材料,考察其对复合材料耐土壤腐蚀性的影响,发现添加酞菁绿的复合材料耐土壤腐蚀性最好,添加氧化锌的复合材料耐土壤腐蚀性最差。分析了复合材料土壤腐蚀前后的力学性能和FTIR数据,提出了一种黎蒴栲/PVC复合材料土壤腐蚀的机理。     

关于奥氏体不锈钢应力腐蚀缓蚀剂研究工作述评

本文综合述评了近年来国内外对奥氏体不锈钢在氯化物水溶液中应力腐蚀的缓蚀剂与缓蚀作用的研究工作,包括无机缓蚀剂、有机缓蚀剂以及相关的缓蚀作用理论。讨论了应力腐蚀缓蚀剂的研究方向及发展前景。     

缓蚀阻垢剂开发试验的计算机构造与分析

采用二次回归组合正交设计法进行了缓蚀阻垢剂开发试验的计算机构造与分析。该软件采用ＦＯＲＴＲＡＮ７７编写，在ＡＳＴ２８６、３８６上通过，共包括六个主要子程序，根据需要考察的因素个数和零点重复次数、各因素上、下水平值，自动给出具体的实验方案，实验结束后输入原始数据，即可得到回归系数和回归方程及其检验结果，根据回归方程进行极值分析、法式分析、最大最小分析及药剂筛选与配方优选     

古代青铜器“粉状锈”锈蚀机理新探

为了寻求方便、可靠的青铜器保护方法,本文通过对几个不同时代青铜残片的本体及“粉状锈”的全面分析,重新探讨了“粉状锈”锈蚀机理。通过分析可知“粉状锈”主要成分为碱式氯化铜、氧化铅、二氯化锡;锈蚀内因为青铜合金的不均匀性;锈蚀条件为:潮湿、含氯离子的环境。     

金属喷焊层在动态介质中的腐蚀

采用动态、静态腐蚀试验和电化学测试方法，研究了腐蚀介质状态和合金成分对金属喷焊层耐蚀性的影响。结果表明，在动态介质中，各种材料的腐蚀速度提高５～１５倍。与静态试验所得出的材料耐蚀性次序不同，静态试验主要反映材料的热力学稳定性，动态试验主要反映材料的动力学特性。喷焊层中铁含量的增加对耐蚀性有不利影响。     

Hydrothermal synthesis and corrosion behavior of the protective coating on Mg-2Zn-Mn-Ca-Ce alloy

Protective coatings were synthesized on the Mg-2Zn-Mn-Ca-CeMg alloy through the hydrothermal method with de-ionized water as the reagent. The coatings were composed of Mg hydroxide, generally uniform and compact.Hydrogen evolution tests and electrochemical tests in the Hanks' solution demonstrated that the Mg(OH)_2coatings effectively decreased the bio-degradation rate of the Mg alloy substrate. Microstructure observation showed that the coating formation on the secondary phases was more difficult than that on the α-Mg matrix,which led to micro cracks and pores on the secondary phases after drying. Over synthesizing time, the coating layer on secondary phases gradually becomes more compact and uniform. Meanwhile, owing to the thicker and more compact coatings, the corrosion resistance and protective efficiency were significantly improved with longer synthesizing time as well.     

高镍铬合金涂层材料抗硫酸盐腐蚀性能研究

对用于几种电站锅炉管道涂层材料Ni50Cr50和FeCrAl在750℃下抗硫酸盐腐蚀性能作了研究，并和钢研102G作了对比，采用扫描电镜(SEM)和能谱(EDS)作同步面分析，对腐蚀产物的形貌和成分进行了分析。     

Corrosion of magnesium and magnesium –calcium alloy in biologically-simulated environment

A study of biocompatibility and corrosion of both metallic magnesium(Mg) and a magnesium alloy containing 1% calcium(Mg–Ca) were investigated in in vitro culture conditions with and without the presence of bone marrow derived human mesenchymal stem cells(h MSCs).Chemical analysis of the degraded samples was performed using XRD and FEGSEM. The results from the XRD analysis strongly suggested that crystalline phase of magnesium carbonate was present on the surface of both the Mg and Mg–Ca samples. Flame absorption spectrometry was used to analyse the release of magnesium and calcium ions into the cell culture medium. Magnesium concentration was kept consistently at a level ranging from 40 to 80 m M for both Mg and Mg–Ca samples. No cell growth was observed when in direct contact with the metals apart from a few cells observed at the bottom of culture plate containing Mg–Ca alloy. In general, in vitro study of corrosion of Mg–Ca in a biologicallysimulated environment using cell culture medium with the presence of h MSCs demonstrated close resemblances to in vivo corrosion. Although in vitro corrosion of Mg–Ca revealed slow corrosion rate and no immediate cytotoxicity effects to h MSCs, its corrosion rate was still too high to achieve normal stem cell growth when cells and alloys were cultured in vitro in direct contact.     

In fl uence of the extraction parameters on the cytotoxicity test results of Mg materials

Recently more and more researchers query the predictability of cytotoxicity results of biomedical Mg alloys obtained according to ISO 10993 due to significant difference between in vitro and in vivo corrosion. This study aimed to observe the influence of different extraction parameters(time, volume/surface ratio and medium composition) on cytotoxicity results and illustrate whether more predictable results could be obtained by adjusting the extraction parameters. The results showed that longer extraction time and smaller extraction volume/surface ratio improve the sensitivity of screening Mg materials by making inferior Mg materials release relatively more ions to the extract; and more predictable results could not be obtained by the way of simply adding bovine serum albumin(BSA) into the extraction medium to the same level in vivo or simply using fetal bovine serum(FBS) directly as extraction medium, since BSA and FBS accelerated the corrosion of Mg materials during extraction and they affected the cells’ health states during the test. In order to get more predictable results, in our opinions, it is necessary to establish a database of primary cells’ hazards(metal ions, p H and H2gas) tolerance and a set of in vitro corrosion test with high similarity in vivo, which is very difficult to realize now however.     

油井水泥腐蚀的能谱分析研究

将水泥石在含有不同离子成份的腐蚀液中浸泡,用能谱仪测定了腐蚀后水泥石中各元素的含量。发现,氯离子、硫酸根离子能渗入到水泥石内部深处;在水泥浆中加入硅灰,这种作用明显减弱;在上述两种水泥石内部,镁离子的含量均无明显变化。指出,硫酸根离子在水泥石内的扩散不完全是物理扩散,也有化学扩散;要防止硫酸根离子的侵蚀,改变水泥水化产物的组成是关键;要防止镁离子的侵蚀,水泥石不应有缺陷。