共查询到20条相似文献，搜索用时 69 毫秒
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1235铝合金二步电解法着黑色工艺研究 总被引：3，自引：0，他引：3
采用二步交流电解着色法，研究了硫酸阳极氧化膜、着色液成分对1235铝合金着色效果的影响，提出了最佳工艺条件。研究表明：当硫酸阳极氧化膜厚为10μm。左右、在15V交流电以及着色液中含20g／L SnSO4和Ⅱ号添加剂着色时，可获得均匀、耐蚀性好、色泽光亮的深黑色阳极氧化膜。 相似文献
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铝及铝合金硬质阳极氧化膜层的脆性及其对策 总被引：1，自引：0，他引：1
安原初 《新乡师范高等专科学校学报》2000,14(2):77-79
讨论了铝质零件硬氧化膜层的性质．提出了在不同曲面上膜层的临界厚度概念,通过分析与实验．推荐了膜层的临界厚度值、电解液配方、工艺参数及后处理方案 相似文献
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游泳馆门窗铝合金表面着膜黑色,既可提高铝件的吸热与防蚀性能,又可提高其视觉装饰效果．本文采用一种通过两步化学氧化着黑色的新技术,得到了结合力好、耐蚀性强、颜色鲜艳美观的铝合金黑色氧化膜。 相似文献
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研究发现铝表面生成的氧化膜可溶于盐酸,不溶于硫酸、硝酸等酸。但在硫酸、硝酸水溶液中加入NaCl,铝表面的氧化膜可溶解。铝表面的氧化膜在CuCl2溶液中可溶解,但在CuSO4、Cu（NO3）2的溶液中不能溶解。 相似文献
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铝合金表面铬酸盐化学氧化工艺因其有毒,污染环境等缺陷逐渐被无铬化学氧化工艺所取代,研究铝合金无铬化学氧化工艺是铝合金表面处理的发展趋势之一,国内外主要铝合金无铬化学氧化工艺包括锆盐氧化法、钛盐氧化法、稀土金属盐氧化、钼酸盐氧化法、硅烷处理等。 相似文献
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为了提高镁合金耐腐蚀性能,采用正交试验对镁合金环保型阳极氧化电解液进行优化,确定了最佳的电解液组成,并通过全浸试验和动电位极化曲线等检测手段研究膜层的耐腐蚀性能.结果表明:镁合金经组成为50g/L氢氧化钠、100 g/L硼酸钠、20 g/L硅酸钠的电解液氧化后,表面生成的氧化膜光滑、平整、致密性好,腐蚀电位提高75 mV左右,耐腐蚀性能提高45%左右,对镁合金基体有良好的防护性. 相似文献
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选择压铸铝合金ADC12为研究对象,确定黑色为着色系,在确定的电解着色工艺下,重点探讨溶液种类、浓度和温度等阳极氧化工艺参数对黑色膜完整性、色泽度的影响。通过系列试验,优选工艺参数如下:以水磨、抛光、除油为前处理;在直流电压20 V下,于20%H2SO4溶液中进行阳极氧化,温度为40℃,反应时间为40 min,可获得黑度系数达0.9且膜色均匀的染色膜层。结合基体显微组织分析,认为要改善膜层着色效果,宜先通过有效的熔体处理,改善基体组织形态。 相似文献
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研究了硫酸-硫酸铁酸性溶液氧化吸收硫化氢的工艺条件.采用廉价的天然原料,氧化吸收和铁盐再生同步完成,可以连续运行.工艺条件为:室温,0.5mol/L硫酸,1.0mol/L铁离子,硫化氢最大吸收率为99.2%. 相似文献
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研究了大气条件下Ni-21．3％Cu-3．5％C合金在450℃、600℃和750℃的氧化动力学。采用环境扫描电子显微镜（ESEM）、X-射线（XRD）和能谱仪（EDS）分析氧化膜形貌、结构和化学成分。研究表明：Ni-21．3％Cu-3．5％C舍金氧化动力学曲线不是抛物线与直线的简单叠加，而是具有其它多种形式。合金的氧化过程包括Ni、Cu的氧化增重和石墨氧化失重，但以石墨氧化失重为主。氧化膜为双层结构：内层为薄而致密的CuO层，外层为厚而均匀的NiO膜层。当球状石墨严重氧化形成凹坑后，金属氧化物很容易在坑壁上长成“冰晶状”。750℃氧化16h时膜厚约3．3μm。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献