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1.
利用酸蚀处理技术对Al2O3喷砂处理后的种植体表面进行改性处理。采用扫描电镜(SEM)、表面接触角分析仪、表面轮廓仪等研究酸蚀处理后种植体的表面形貌、粗糙度和亲水性等表面特性。结果表明:酸蚀处理可促使种植体表面形成了多孔洞结构,进而改变其表面特性;当酸蚀处理20min时,种植体表面形成了蜂窝状多级孔洞结构,其表面粗糙度Ra为(1.77±0.064)μm、表面接触角为(47.7±3.022)°,有利于种植体与骨组织形成骨性结合。  相似文献   

2.
王金磊  李刚  杨扬  金克武  鲍田 《表面技术》2021,50(7):165-171, 224
目的 提高蒙砂玻璃的雾度以及调控其表面的亲疏水性.方法 通过在酸蚀液中添加不同浓度的KCl,可控调节蒙砂玻璃表面微纳结构,并利用光学轮廓仪对表面形貌和粗糙度进行表征分析.通过分光光度仪对蒙砂玻璃的雾度、透过率进行测试,并使用接触角测量仪对其亲疏水性进行分析评价.结果 通过调节酸蚀液中KCl的加入量,得到具有不同表面微结构及表面粗糙度的蒙砂玻璃.酸蚀液中KCl的加入,可以实现不损失玻璃透过率的同时,将蒙砂玻璃的雾度提高1个数量级,从4.23%提高至73.11%.酸蚀液中加入质量分数20%的KCl,可实现蒙砂玻璃表面较好的亲水性,接触角达20.9°,而玻璃原片的接触角仅为47.5°.在蒙砂玻璃表面涂覆十三氟辛基三乙氧基硅烷,100℃下热处理30 min,可实现蒙砂玻璃较强的疏水性,对水的接触角达到124.3°.结论 酸蚀液中加入KCl可以实现酸蚀蒙砂玻璃表面微结构的构建,并且通过控制KCl的加入量,提高蒙砂玻璃的透过率和雾度,实现较好的亲水性.用低表面能物质十三氟辛基三乙氧基硅烷成功对具有一定表面微结构的蒙砂玻璃进行修饰,将蒙砂玻璃由亲水性变为较强的疏水性.  相似文献   

3.
用浸泡法在430不锈钢表面制备了十四烷基膦酸自组装膜,利用Fourier反射红外,动电位扫描、接触角测试、电化学阻抗及X射线光电子能谱研究了该自组装膜在430不锈钢表面的吸附行为和对点蚀电位的影响。结果表明:吸附有十四烷基膦酸分子的430不锈钢表面由亲水性转为疏水性,自组装时间为6 h时不锈钢的点蚀电位较高;氧化处理能够提高不锈钢基底的点蚀电位,且氧化处理后的不锈钢表面也能在十四烷基膦酸溶液中形成保护性的自组装膜。  相似文献   

4.
等离子体氧化方法能够在纯钛种植体表面产生梯度变化的 TiO2- x层,使其显著提高表面的亲水性和生物相容性,但是在空气中长期存放由于吸附的污染物,种植体表面很容易失去这些特性。 因此,需要一些存储方法来防止表面失效。 利用辉光等离子体放电技术在喷砂酸蚀(SLA)的纯钛表面进行等离子体氧化,然后对氧化后的样品进行 NaOH 溶液存储。 分析了 NaOH 溶液存储前后的表面特性,观察了 NaOH 溶液存储不同时间后表面亲水性的时效性,以及比较了 NaOH 溶液和生理盐水长期存储对表面亲水性的影响。 结果表明,NaOH 溶液处理后等离子体氧化表面形貌和化学成分无太大变化;NaOH 溶液存储时间对于亲水性的时效性无影响;NaOH 溶液是否残留不影响亲水性;将氧化后的样品直接储存在 NaOH 溶液或生理盐水中,可以长期保持表面的超亲水性。 对于纯钛表面超亲水性的长期稳定性,NaOH 溶液优于生理盐水。  相似文献   

5.
通过不同的前处理方法对6063铝合金进行表面调控前处理,采用SEM、EDS、AFM分别对铝合金表面的微观形貌、成分与电势分布进行研究;采用电化学动电位扫描与电化学阻抗技术对铝合金材料的丝状腐蚀速率进行了研究。微观分析发现碱蚀后再经含氟离子溶液酸蚀处理可以减少铝合金表面第二相数量,提高合金材料耐蚀性;电化学试验结果表明,该处理可降低铝合金材料的丝状腐蚀电流,并且在电化学阻抗谱中具有较小的双电层电容(Cdl)与较大的电荷迁移电阻(Rct),而单一的混合溶液酸蚀前处理不能降低铝合金材料的丝状腐蚀速率。  相似文献   

6.
研究AZ91D镁合金表面前处理的除油、酸蚀工艺,对不同除油、酸蚀工艺配方进行了失重、外观性能指标的对比分析,提出了最佳工艺配方;在酸蚀溶液中添加硫脲、六次甲基四胺缓蚀剂减少镁合金溶解量,提高光泽度;采用自腐蚀电位跟踪法研究了镁合金在不同前处理溶液中的电位变化情况;采用光学金相显微镜研究了前处理后镁合金表面形貌;在添加1 g/L缓蚀剂的乙酸溶液中可以获得表面光泽度好、微观缺陷少的镁合金基材。  相似文献   

7.
采用化学镀法,将金属Ag粒子致密镀覆在自制聚苯乙烯微球表面,制备了具有高导电特性的PS/Ag复合粒子,通过正交实验优化了制备工艺.结果表明:表面粗化处理、AgNO3/PS质量比和NH3·H2O浓度3个因素对复合粒子的体积电阻率产生了重要影响;粗化处理在PS微球表面引入了磺酸基团,提高了PS微球表面的电负性和亲水性,对包...  相似文献   

8.
目的 研究在具有微纳米双级结构的3D打印钛合金植入体表面制备聚多巴胺涂层的最佳工艺及参数。方法 对酸蚀和阳极氧化处理后的3D打印Ti-6Al-4V样品进行水热处理,通过水热法将聚多巴胺添加到样品表面,并分析不同水热温度和时间的处理效果。使用扫描电子显微镜、三维共聚焦激光显微镜、X射线光电子能谱仪、接触角测量仪、电化学工作站对各组样品的表面形貌、粗糙度、元素组成、表面润湿性、耐腐蚀性等进行表征。结果 经过酸蚀和阳极氧化处理后,在3D打印钛合金植入体表面成功制备了微纳米双级结构,表面纳米管的管径为80 nm左右,水热处理后各组表面均可以观察到有涂层附着。样品表面元素分析结果表明,各组样品表面的N/C值均与理论值0.125接近,证明水热处理成功在微纳米结构表面添加了聚多巴胺涂层。随着水热处理温度的升高和时间的延长,纳米管的管径逐渐减小,由80 nm减小至40 nm左右。随着反应时间的延长,样品表面粗糙度逐渐降低,各组粗糙度均保持在4~5 μm,且接触角逐渐减小,酸蚀后的表面接触角为52.1°,阳极氧化后,接触角降低至42.9°。经过水热处理,各组接触角均小于35°,表现出较好的亲水性。相比于酸蚀组和阳极氧化组,水热处理后的各组的耐腐蚀性均得到增强。结论 在基本保留原有微纳米双级结构的前提下,37 ℃的反应温度和24 h的反应时间适用于聚多巴胺在钛合金植入体表面的沉积。研究结果为聚多巴胺在钛合金植入体表面自聚合的工艺参数优化提供了参考。  相似文献   

9.
化学氧化处理对不锈钢表面性质的影响   总被引:2,自引:1,他引:1  
研究了化学氧化处理对不锈钢(1Cr18Ni9Ti)表面亲水性、表面自由能及表面化学结构的影响,并提出了此三者之间的关系。研究结果表明:化学氧化处理可以有效改善不锈钢的表面亲水性,且亲水性随处理时间的延长和处理温度的升高而升高,最佳工艺条件是处理温度为75℃,处理时间为8min;经化学氧化处理后,不锈钢的表面自由能γgs及其极性分量γgs^p显著增大,使不锈钢表面呈现出极强的亲水性;多功能电子能谱分析表明,表面自由能γgs及其极性分量γgs^p的增加与表面及一定厚度范围内含氧极性基团的增加有关。  相似文献   

10.
对钛表面喷砂酸蚀工艺进行优化研究,以用于牙种植体表面改性。采用喷砂酸蚀法对钛片表面进行粗化处理,以粗化的钛片表面中0.5~2μm孔洞所占比例和表面平均接触角作为正交试验的参考指标,对喷砂酸蚀工艺进行优化。在试验范围内,表面处理的最优参数为:喷砂材料TiO2,酸蚀温度100℃,酸蚀时间20min,混酸60%H2SO4、10%HCl和去离子水的体积比1∶1∶2。将得到的最优参数应用于钛片和牙种植体,利用扫描电镜、接触角测量仪及能谱仪对其形貌、接触角、成骨细胞粘附及成分进行分析。结果表明:优化工艺处理后,钛片表面平均接触角达67°,且均匀性较好,利于细胞吸附生长;钛片和牙种植体表面都获得了均匀的微米级孔洞结构,但种植体螺纹不同部分的表面形貌不一样。  相似文献   

11.
Electroless nickel (EN) coatings with phosphorus are preferred in many industries such as the oil, chemical, plastic, mechanical, and electronic industries because of their excellent corrosion and wear resistance. This work evaluates the corrosion and wear-corrosion resistance of electroless nickel-phosphorus (ENP) coatings on glass fiber-reinforced plastic (GFRP) composites that are frequently used in wind turbine blades. The results demonstrated that the micro-porosity, phosphorus content, thickness and corrosion and wear-corrosion properties of ENP coatings on the GFRP substrate were all strongly related to the grinding pre-treatment condition, meaning the corresponding surface roughness state of the substrate. A higher P content (P > 7 wt.%), lower micro-porosity, greater thickness and greater hardness of the ENP coatings on GFRP substrate were obtained as the surface roughness of the substrate increased over 0.3 µm (as it did upon grinding with emery paper of lower than 800-grade), improving corrosion and wear-corrosion resistance properties.  相似文献   

12.
Amorphous Ni-P layers with 8-10 wt.% phosphorus were deposited by sodium hypophosphite onto AlMg2 type aluminium alloy substrates after different pre-treatments. Prior to the electroless nickel-phosphorus (ENP) deposition in an acetate and lactic acid based nickel bath, the widely applied Zn (zincate) or Ni displacement (Ni strike) pre-treatments for aluminium substrates as well as a non-conventional surface conditioning one (soaking in a warm solution containing only hypophosphite and lactic acid) were all tested and their effects evaluated on the corrosion and other properties of the Ni-P layers developed right afterwards. The surface morphology and structure of the ENP layers were characterized by scanning electron microscopy and X-ray diffraction analysis. Polarization resistances were measured in 0.5 mol dm− 3 Na2SO4 solution at pH 3. Compared to the direct electroless plating on the bare aluminium alloy AlMg2, it was found, that the hypophosphite adlayer (hypophosphite immersion pre-treatment) have also increased the corrosion resistance as the displacement pre-coatings, but without decreasing the deposition rate unlike conventional displacement methods. In the studied ENP deposition systems the decrease of corrosion rate could mainly be attributed to the lower microporosity and smoother morphology of the nickel-phosphorus coatings.  相似文献   

13.
李晓乐 《表面技术》2020,49(10):176-181
目的 提升PbO2电极寿命以及对酚类废水的电氧化催化活性和选择性。方法 分别添加离子液体1-丁基-3-甲基-咪唑六氟磷酸盐([BMIM]PF6)和1-乙基-3-甲基-咪唑四氟硼酸盐([Emim]BF4)至Pb(NO3)2溶液中,用阳极电积法制备了有SnO2+Sb2O3中间层的PbO2电极。通过扫描电镜(SEM)、X射线衍射仪(XRD)、加速寿命实验、线性扫描和循环伏安测试、电氧化降解实验等考察了不同离子液体的电离产物对电极性能的影响,并与采用F-修饰的常规PbO2电极的性能进行了对比。结果 离子液体修饰的PbO2电极晶粒结晶度高,晶面取向发生改变,晶粒大小均一度高,表面平整致密、棱角多,电极有效表面积和活性点增多,且[BMIM]PF6修饰的PbO2优于[Emim]BF4修饰的PbO2。[BMIM]PF6修饰的PbO2和F-修饰的PbO2的加速寿命和电极性能稳定期分别为168.8、162.6 h和101.2、69.8 h,析氧电位分别为1.71 V和1.59 V。循环伏安显示,[BMIM]PF6修饰PbO2氧化峰电位更小,氧化峰电流更大,相同条件下,[BMIM]PF6和F-修饰PbO2对p-NP废水的电氧化降解率和有机碳去除率分别为95.7%、87.1%和85.2%、61.5%,而电解槽槽压分别为3.26 V和3.47 V。结论 离子液体[BMIM]PF6、[Emim]BF4修饰PbO2电极的结晶度、晶粒均一性、致密性增强,电极活性点增多,且由于两种离子液体电离的离子大小不同,导致对电沉积晶粒的空间位阻不同,使得前者强于后者。晶粒形态和组织结构的差异,使得[BMIM]PF6修饰PbO2对酚类废水的电氧化催化活性、选择性和寿命显著增强。  相似文献   

14.
目的 提高环氧树脂的耐磨性并改善其力学性能,探究纳米氧化铝掺杂酚醛/环氧复合材料的摩擦磨损行为并揭示其减摩耐磨机制。方法 以酚醛树脂(PF)改性环氧树脂(EP)为聚合物基体,将改性的纳米氧化铝(Nano-Al2O3)掺杂其中,制备不同配比的Nano-Al2O3掺杂PF/EP聚合物基复合材料。利用红外光谱仪(FTIR)对复合材料进行化学结构表征。通过泰伯磨损试验和硬度分析,对比不同含量Nano-Al2O3掺杂对PF/EP基复合材料耐磨性能的影响。借助扫描电镜(SEM)分析复合材料的断面形貌和磨损表面,探究复合材料的磨损机理和减摩耐磨机制。结果 FTIR测定证实了硅烷成功改性Nano-Al2O3,并参与到PF与EP的固化反应中。硬度分析及磨损试验表明,硅烷改性Nano-Al2O3和PF的加入都提高了复合材料的硬度和耐磨性。与纯EP相比,酚醛质量分数为30%,掺杂3%Nano...  相似文献   

15.
The initiation and inhibition of the pit formation (PF) on metals and binary alloys are considered as a consequence of complexation reactions and nucleophilic substitution of ligands in surface complexes. The problems under discussion include the possibility of studying the kinetics of these reactions by measurement of the PF induction period and the dependence of the effective activation energy of the process on the solution composition and on the metal or alloy nature. The role of the electrode potential in the adsorption of anions on passive iron is emphasized; this adsorption is described by the Frumkin isotherm in the case of efficient PF inhibitors belonging to the arylcarboxylate or dialkylphosphate classes. The concepts of the PF potential and the effective overvoltage of the reaction leading to PF are analyzed. Examples of PF and its inhibition which can only be explained using the complexation concept are considered.  相似文献   

16.
1. IntroductionA pplication oflargeheatinputw elding techniques, w hich have been developed forlarge engineer-ing structure, e.g., big oiland gas tanks, bridge, pipe-line and architecture constructions etc. usuallycausesdeterioration ofm echanicalproperti…  相似文献   

17.
The microstructure and the characteristics of the inclusions embedded in ferrite matrix in simulated coarse-grain heat affected zone (CGHAZ) of a Ti-Zr-treated high strength low alloy (HSLA) steel have been investigated. The microstructure of the simulated CGHAZ dominantly Consisted of intragranular acicular ferrite (IAF) combining with a small amount of polygonal ferrite (PF), widmanstiitten ferrite (WF), bainite ferrite (BF), pearlite and martensite-austenite (M-A) islands. The PF, WF and BF were generally observed at the prior austenite grain boundaries and the interlocking acicular ferrite was usually found intragranularly. It was found that the inclusions were composed of Ti2O3 ZrO2, Al2O3 locating at the center of the particles and MnS lying on the surface layer of the inclusions. The intragranular complex inclusions prorooted the acicular ferrite formation and the refinement of microstructure whilst those at prior austenite grain boundaries caused PF formation on the inclusions. The simulated CGHAZ consisting of such complicated microstructure exhibited desired mechanical properties.  相似文献   

18.
Drilling CFRP poses major challenges from the perspective of rapid tool wear and poor hole quality, with the development of higher strength fibers further accentuating these problems. Cryogenic treatment is one way of increasing tool hardness thereby improving tool life and hole quality through longer retention of cutting edge sharpness. In this study, tool wear is monitored by measuring flank wear, cutting edge flatting (CEF), peak flatting (PF) and cutting edge surface roughness (CESR). While flank wear is unable to distinguish the better performance of the cryo-treated drill from the untreated drill, the other wear parameters are able to account for the better hole quality (exit delamination) produced by this drill. CEF and PF are direct measures of the extent of cutting edge blunting unlike flank wear which measures wear along the flank due to rubbing. Fiber pullout is the primary reason for deterioration in surface finish and Rz and Rv are better measures than Ra in estimating surface quality.  相似文献   

19.
Physical vapor deposition method was employed to deposit antimony telluride(Sb2Te3) crystals in a dual-zone furnace. The microstructure, surface topography and composition of samples were characterized using X-ray diffraction,atomic force and scanning electron microscopy. Seebeck coefficient(S\c), electrical conductivity(r\c) as well as power factor(PF) were enhanced for pure Sb2Te3 samples upon annealing, and the samples annealed at 473 K exhibited the highest PF of 3.16 9 10-3W m-1K-2with an enhancement of 22% in the figure of merit(Z). When the delivered dose of60 Co gamma radiation was increased from 0 to 30 k Gy in the stoichiometric crystals, r\c decreased due to the decrease in mobility. As a result of the increase in S, PF and Z improved by 12.11 and 13.7%, respectively, in the 30 k Gy gammairradiated crystals. Both RH(B||c) and S\c were positive, suggesting that the prepared Sb2Te3 crystals retained the p-type semiconductivity after these treatments.  相似文献   

20.
环保型 AZ91D 镁合金直接化学镀镍工艺研究   总被引:1,自引:1,他引:0  
谢治辉 《表面技术》2015,44(2):24-28,47
目的开发一种无铬、低氟、稳定的镁合金直接化学镀镍工艺。方法通过SEM,EDX及浸泡实验、动电位极化曲线、划格试验等方法 ,以稳定系数和镀速等参数为对象,对比新工艺和传统工艺对镀层或镀液性能的影响。结果在以硫酸镍为主盐的基础液中,添加质量浓度为0.5 mg/L的硫脲,镀液的稳定性可得到明显的提高。在使用硝酸+磷酸酸洗后的镁合金试样表面,获得了良好的腐蚀形貌结构,这种结构有利于增强镀层与基底间的机械咬合作用。新工艺获得的镀层属高P镀层(P的质量分数约为11%),在Na Cl溶液中的自腐蚀电位由-1.5 V正移至-0.5 V,腐蚀电流密度降低了约3个数量级。结论以硫酸镍主盐镀液获得的镀层耐蚀性优于碱式碳酸镍主盐镀液获得的镀层,镀液的最佳p H=5,化学镀镍温度为82℃。  相似文献   

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