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排序方式: 共有332条查询结果,搜索用时 15 毫秒
1.
A. MONSALVE M. PÁEZ M. TOLEDANO A. ARTIGAS Y. SEPÚLVEDA y N. VALENCIA 《Fatigue & Fracture of Engineering Materials & Structures》2007,30(8):748-758
The S-N-P (stress, number of cycles, failure probability) curves for 2024 T3 and 7075 T7351 aluminium alloys were obtained. Previously, surface treatments of degreasing and different types of anodizing were applied to samples, evaluating the influence of these treatments on the fatigue life of the alloys. The determination of the S-N-P curves was done using Maennig's method. Rotary fatigue was used because this technique produces greater stress on the sample surfaces, the zone in which it is important to evaluate fatigue resistance. Both the transition range and the finite life range were evaluated, calculating the 1, 50 and 99% fracture probability. SEM was performed in order to characterize the fracture micromechanism. The conclusions were that Maennig's method is useful to evaluate fatigue life of these materials in a fast and efficient manner. Moreover, surface treatments produce a decrease in the fatigue life of both alloys, associating this effect with the surface damage produced on each sample during the treatment. 相似文献
2.
The influence of convective heat transfer on constant current density anodizing of aluminium in sulfuric acid has been examined in a wall-jet electrode reactor. The uniformity of the anodic film thickness is related to the local electrode temperature distribution, which is dependent on the convection. The higher the local temperature, the greater the local oxide thickness. An increased local temperature enhances local field assisted oxide dissolution at the pore bases, and consequently acts to increase the local current density. At relatively high current densities, local features develop on the electrode surface, accompanied by high initial, local temperature rises. The relevance of such local features, limiting useful oxide growth, is considered further. 相似文献
3.
J.M. Montero-Moreno 《Surface & coatings technology》2007,201(14):6352-6357
1050 Aluminum alloy sheets were used to analyze the influence of a surface treatment on the characteristics of the alumina layer formed in a two-step anodizing. The study was mainly focused on two pretreatment steps, electropolishing and acid etching, as well as on the intermediate stripping step. The pretreatment procedure was optimized by accounting for the chemical nature of the substrate, with the results indicating that additional pretreatment steps enhanced the self-ordered porous arrangement. The E-t curves recorded during the experiments demonstrated that the best alumina layers were obtained when the first barrier layer had a high resistance; i.e., a high anodizing potential. The application time of the stripping step was optimized to clean the surface from alumina remains, without damaging the aluminum substrate. By optimizing all of these experimental conditions, we were able to obtain porous anodic aluminum oxide layers displaying ordered domains several hundreds of nanometers in length. 相似文献
4.
铝合金交流电氧化工艺的研究 总被引:4,自引:0,他引:4
较详细地介绍了采用降压后的交流电市电对含铜或含硅的铝合金的阳极氧化方法和影响因素。实验表明,交流电氧化可以获得膜层厚、硬度高、耐蚀性好的氧化膜。该法也适用于一般纯铝的阳极氧化。 相似文献
5.
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20V下,于20%H2SO4溶液中进行阳极氧化,温度为40℃。反应时间为40min,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
6.
The effects of insoluble eutectic Si particles on the growth of anodic oxide films on ZL114A aluminum alloy substrates were in-vestigated by optical microscopy (OM) and scanning electron microscopy (SE... 相似文献
7.
LD7铝合金阳极氧化膜的不同封闭方法耐蚀性评价 总被引:4,自引:0,他引:4
研究了不同封闭方法对LD7铝合金阳极氧化膜在NaCl溶液中耐蚀性的影响,包括沸水封闭、氟化镍封闭、重铬酸钾封闭和醋酸镍封闭.利用动电位极化和电化学阻抗谱(EIS)研究了封闭后阳极氧化膜的腐蚀行为.利用扫描电子显微镜(SEM)观察了封闭后阳极氧化膜的表面形貌.结果表明在酸性溶液和碱性溶液中醋酸镍封闭能提供更高的耐蚀性,而沸水封闭在中性溶液中较耐蚀.工业生产中普遍采用的重铬酸钾封闭对LD7铝合金阳极氧化膜封闭效果并不理想,封闭后的阳极氧化膜在不同pH值的溶液中耐蚀性均不高,氟化镍封闭的阳极氧化膜层耐酸性不强. 相似文献
8.
镁及镁合金阳极氧化技术 总被引:22,自引:4,他引:22
镁是目前最轻的金属结构材料之一,具有优良的物理和力学性能,应用日益受到关注,但耐蚀性差却制约了其应用范围,寻找一种合适的表面处理方法已成为必然。简要评述了镁及镁合金的各种阳极氧化处理方法,包括Dow17、HAE、Anomag、Magoxid—coat、Tagnite氧化方法,以及已见于报道的、但仍处于实验室研究阶段的各种阳极氧化处理方法。 相似文献
9.
JIANG Guang WU Yinshun LI Jiuqing LIU Haiping University of Science Technology Beijing Beijing China Department of Surface Sciences Corrosion Engineering University of Science Technology Beijing Beijing China 《金属学报(英文版)》1993,6(8):102-107
Observation was carried out of the structure of sulphuric,oxalic or phosphoricfilm on Al after treatment of reanodizing and electrolytic depositing lubricant in(NH_4)_2MoS_4 solution,as well as of the deposited products by means of EMPA,TEMand energy spectro-scopic analysis.The deposited products are mixture of compounds ofS and Mo rather than single MoS_2 and most of them dcposited near the surface layerof the film.Some regular long pores without barrier layer occurred in the film,but theregular fine channels without relation to the structural element parameters of originalanodized film were found in the thickened barrier layer of phosphoric film.Sulphur maybe remained as Mo sulphide in the film during heating under Ar protective environment. 相似文献
10.
铝合金表面处理技术新进展 总被引:11,自引:0,他引:11
周鼎华 《热处理技术与装备》2006,27(4):10-15
简要介绍了铝合金表面处理技术的新进展,重点介绍了铝合金的阳极氧化、电镀、化学镀和微弧氧化、激光熔覆等工艺. 相似文献