共查询到20条相似文献,搜索用时 140 毫秒
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黑色金属的发蓝,传统上是在苛性钠的溶液中,以硝酸盐作为氧化剂来进行的。本文提出的无碱发蓝工艺,是将发蓝溶液不用苛性钠,完全由硝酸盐和亚硝酸盐配成,在300~350℃的温度下进行氧化处理,使金属表面获得一层蓝色氧化物膜。这种蓝色氧化物膜外观鲜艳,色泽均匀,其耐蚀性,在室内常温下可存放三年以上。本文详细介绍了该工艺的流程、发蓝液的配方、操作条件及所用的设备,并对该氧化膜的组成成份、它的氧化过程和氧化膜的生成机理进行了分析研究,还探讨了发蓝液的组成、温度、处理时间及零件的表面状态对发蓝膜质量的影响。本工艺操作简单、工艺稳定、成本低,适合大批量零件的发蓝生产。 相似文献
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镀锌及锌合金着黑色新工艺 总被引:3,自引:0,他引:3
介绍了镀锌及锌合金层常温,快速着黑色新工艺,该工艺配方的原料便宜易得,操作简介,无毒无害,省能省时,着色膜具有良好的耐蚀性,耐磨性,稳定性和附着力。 相似文献
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蒸汽发蓝工艺可以解决常温发蓝和常规低温碱性发蓝中存在的问题,比如成分变动大、操作条件高、很难进行监控、劳动强度高等问题,蒸汽发蓝工艺比传统的低温碱性发蓝工艺的应用范围大的多,而且存在着膜层性能好、容易控制质量、操作很简单,没有污染、具有很高程度的自动化,适合批量生产等优点。本文对蒸汽发蓝工艺进行了探讨,并对蒸汽发蓝工艺的应用范围和效果进行了探讨。 相似文献
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介绍了一种新型无毒的镁合金无铬化学转化处理方法。正交试验获得的最佳工艺参数为:8g/LNa^+,0.5g/LcO^-23,0.01g/L辅助成膜剂N,处理时间30min,处理温度30℃。研究了膜层的耐蚀性及其与不同漆膜之间的附着力。结果表明,在优化工艺下获得的膜层具有优良的耐蚀性(耐中性盐雾试验时间〉96h)和漆膜附着力(达到1级)。 相似文献
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电子设备在装配与使用过程中,经常出现磨损情况。为此,采用润滑耐磨涂料进行涂覆层实验,对涂层附着力、硬度、表面形貌、耐磨性及耐蚀性进行测试,并进行了比较。结果表明,润滑耐磨涂料制备的膜层各项性能最优,适合于电子设备表面润滑耐磨的工艺要求。 相似文献
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The effects of multiwalled carbon nanotube (MWCNT) content on the adhesion strength and wear and corrosion resistance of the epoxy composite coatings prepared on aluminum alloy (AA) 2024-T3 substrates were evaluated using atomic force microscopy (AFM), blister test, ball-on-disk micro-tribological test and electrochemical impedance spectroscopy (EIS). The adhesion strength of the epoxy composite coatings improved with increasing MWCNT content. Increased MWCNT content also decreased the friction coefficient and increased the wear resistance of the epoxy composite coatings due to improved solid lubricating and rolling effects of the MWCNTs and the improved load bearing capacity of the composite coatings. Finally, EIS indicated that increased MWCNT content increased the coating pore resistance due to a decreased porosity density, which resulted in an increase in the total impedance of the coated samples. 相似文献
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陶瓷涂层以其优异的耐磨损、耐高温、耐腐蚀等性能表现出巨大的工程应用前景。但是,在服役过程中因温度变化和受力诱发的裂纹产生、扩展,甚至导致涂层开裂、剥落及失效,这些因素限制了涂层的应用,因此通过结构优化改善陶瓷涂层的抗开裂、剥落性能较为重要。本文首先论述了纳米结构涂层、耐磨多层涂层、复合涂层的失效机理及其结构优化。提出了利用单次喷涂制备粘结层和陶瓷层的方法,通过该方法可以消除陶瓷层与粘结层间的界面形态,提高涂层的断裂韧性、粘结强度。最后展望了陶瓷涂层在材料组分设计和工艺优化研究中应重点关注的方面。 相似文献
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溶胶-凝胶/环氧杂化涂料的应用 总被引:1,自引:0,他引:1
溶胶-凝胶/环氧杂化涂料的配方已经进行了研究,杂化涂料具有更强的机械强度(如硬度),更加耐磨蚀。当固化温度提高到80℃,全部研究的杂化涂料都能通过湿性黏结试验,但在室温下固化时仅有部分的杂化涂料通过湿性黏结试验。多数杂化涂料在室温下固化时对水的敏感性问题尚待解决。 相似文献
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Alternative process to hexavalent chromium plating, substitute materials and new designs are urgently needed owing to the requirement of “clean” manufacture. This comparative study was conducted to systematically investigate the tribological and electrochemical behavior of the Cr-C alloy coatings electrodeposited from a trivalent chromium bath and the hard Cr coatings electrodeposited from conventional hexavalent chromium bath, using reciprocating ball-on-disc tribometer and electrochemical analyzer. The electroplated Cr-C alloy coatings with thickness of 50 μm and acceptable quality that can be used for wear resistance as well as corrosion resistance purposes were produced successfully. The results show that the as-deposited Cr-C alloy coatings exhibited crack-free surface and amorphous/microcrystalline structure. The following heat treatment resulted in the cracked surface and the increase in hardness for the electroplated Cr-C alloy coatings. In contrast, the conventional Cr coatings exhibited cracked surface and their hardness decreased with the increase in annealing temperature. The electroplated Cr-C alloy coatings after heat treatment at 200 °C for 1 h exhibited better wear resistance than the conventional Cr coatings. In regard to the electrochemical behavior, the as-deposited Cr-C alloy coatings exhibited better corrosion resistance than the conventional Cr coatings. Therefore, the electroplated Cr-C alloy coatings are environmentally acceptable candidates to replace the conventional Cr coatings. 相似文献
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化学镀制备高耐蚀耐磨Ni-P-SiC复合镀层 总被引:9,自引:1,他引:8
研究了Ni-P-SiC复合镀层的制备工艺和性能以及SiC含量对镀层性能的影响。采用Taber试验机对Ni-P-SiC复合镀层的磨损性能进行了测试,并用VHX-100型三维视频显微镜对磨损形貌进行了观察,分析了复合镀层的磨损机理。结果表明:SiC颗粒的加入能有效地降低摩擦副之间的犁沟效应及摩擦表面发生粘着的面积,从而减少镀层的磨损。采用电化学实验等手段研究了Ni-P-SiC复合镀层的耐蚀性能。当复合镀层均匀一致,能起到一个良好的屏蔽作用时,耐蚀性十分优异;而镀层缺陷的存在将导致耐蚀性能降低。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(7):907-921
A variety of metallic and oxide coatings were deposited under various conditions on 1020 mild steel substrate by conventional plasma spraying. The coating thickness, microhardness, cohesion and adhesion failure loads, friction coefficient, and abrasive wear resistance were evaluated. The coatings were classified as follows, in order of decreasing microhardness and wear resistance: alumina, chromia, 316 stainless steel, Ni-5% Al, elemental aluminum and aluminum-polyester. Wear resistance increased with increasing microhardness and decreasing friction coefficient. The microhardness and wear resistance of high-velocity oxy-fuel (HVOF) diamond jet (DJ)-sprayed aluminum were found to be superior to those of plasma-sprayed aluminum. Plasma or flame-sprayed metallic coatings adhered well to the substrate. The cohesion, adhesion, microhardness, and wear resistance of alumina coatings exceeded those of equally thick chromia coatings. 相似文献
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