材料期刊网

转炉副枪和动态控制

P.D.Hubbeling , G.A.Oostermeijer

钢铁

介绍了达涅利康力斯的转炉副枪系统、静态和动态控制模型。使用副枪系统可以缩短冶炼周期，降低铁水、废钢、氧气的消耗量。静态和动态控制模型可提高冶炼效率，改善吹炼终点温度和碳含量命中精度，降低渣中铁含量。

关键词: 转炉;副枪;动态控制

金属环境中低能D(d, p)T反应的研究

吕会议 , 王铁山 , 陈建勇 , 杨振 , 刘盛进 , 方开洪

原子核物理评论

近年来一系列实验表明,金属环境中的低能带电粒子引起的核反应截面与气体靶中的相比出现明显增大,这种现象通常被归结为电子屏蔽效应. 全面介绍了金属环境中D(d, p)T反应电子屏蔽效应的测量方法、数据分析和实验结果的规律性,并简要论述了包括德拜等离子体模型在内的各种理论模型对实验结果的解释. 通过研究,可以获得有关核物理、核天体物理和凝聚态物理的宝贵知识.

关键词: 低能核反应 , 电子屏蔽效应 , 德拜模型

Electrodeposition of high corrosion resistance Cu/Ni-P coating on AZ91D magnesium alloy

Applied Surface Science

High corrosion resistance Cu/Ni-P coatings were electrodeposited on AZ91D magnesium alloy via suitable pretreatments, such as one-step acid pickling-activation, once zinc immersion and environment-friendly electroplated copper as the protective under-layer, which made Ni-P deposit on AZ91D Mg alloy in acid plating baths successfully. The pH value and current density for Ni-P electrodeposition were optimized to obtain high corrosion resistance. With increasing the phosphorous content of the Ni-P coatings, the deposits were found to gradually transform to amorphous structure and the corrosion resistance increased synchronously. The anticorrosion ability of AZ91D Mg alloy was greatly improved by the amorphous Ni-P deposits, which was investigated by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). The corrosion current density (I(corr)) of the coated Mg alloy substrate is about two orders of magnitude less than that of the uncoated. (C) 2011 Elsevier B. V. All rights reserved.

关键词: AZ91D Mg alloy;Electrodeposition;Ni-P;Corrosion resistance;phosphorus incorporation;pure magnesium;thin-films;ni;pretreatment;deposits;behavior;copper

Study on electroless Ni-P-ZrO2 composite coatings on AZ91D magnesium alloys

Surface Engineering

Electroless Ni-P-ZrO2 composite coatings on AZ91D magnesium alloys was developed and their characteristics were investigated. The experimental results showed that the composite coatings were uniform and compact. The hardness of Ni-P-ZrO2 composite coatings reached the maximum value at 350 degrees C heat treatment, and then decreased at 400 degrees C. The nickel phosphor alloys provided solution strengthening and precipitation strengthening, while the ZrO2 nanoparticles provided dispersion hardening, making the composite coatings harder than that of Ni-P coatings. The wear resistance of Ni-P-ZrO2 composite coatings was obviously superior to Ni-P coatings, especially with longer wear time, which can be attributed to the dispersion strengthening and load support effect of ZrO2 in the coatings. The Ni-P-ZrO2 coatings exhibited better corrosion resistance than that of Ni-P coatings owing to codeposition of ZrO2 together with NiP leading to a more compact composite coating.

关键词: electroless composite coatings;Ni-P-ZrO2;compact;ZrO2 nanoparticles;concentrated slurry;magnesium alloys;AZ91D;microstructure;heat;treatment;hardness;solution strengthening;precipitation;strengthening;dispersion strengthening;wear resistance;load support;corrosion resistance;corrosion;substrate

A Novel near Net-Shape Technique for P/M Parts with Large H/D Ratio

Yong LIU , Baiyun HUANG , Kechao ZHOU , Hongwu OUYANG , Yuehui HE

材料科学技术（英文）

In order to overcome the shortcomings of conventional hot pressing, a novel near net-shape technique, called radial hot pressing, for P/M parts with large height-to-diameter (H/D) ratio was introduced. Effects of processing parameters on the microstructures and density of P/M TiAl base alloy valves were studied. Results show that the radial hot pressing is an effective technique for manufacturing valves with a H/D ratio of about 10:1, and the perfect joint interface between the Mo sheet and the parts is helpful for subsequent HIPing.

关键词: Near net-shape technique , null , null

Electroless Ni-P plating with a phytic acid pretreatment on AZ91D magnesium alloy

Materials Chemistry and Physics

A phytic acid conversion film with especial functional groups was proposed as the pretreatment layer between Ni-P coating and AZ91D magnesium alloy substrate, to replace the traditional pretreatment. In the process, the silane coupling agent was adopted as connector between conversion film and palladium ion with catalysis. The microstructure of the phytic acid conversion coatings was observed using scanning electronic microscopy, while the composition and functional groups were analyzed by energy dispersive spectrometer and Fourier transform infrared spectroscopy. The bonding between Si-OH of the silane coupling agent and hydroxyl of phytic acid was validated by X-ray photoelectron spectroscopy, and the existence of palladium ion was also verified. The subsequent Ni-P deposited on the layer was also characterized by its structure, morphology, and corrosion resistance. The results show that the Ni-P coatings with the phytic acid pretreatment on AZ91D magnesium alloy have good corrosion resistance. (C) 2010 Elsevier B.V. All rights reserved.

关键词: Magnesium alloy;Phytic acid;Electroless nickel plating;Coupling agent;conversion coatings;corrosion;microstructure;nanoparticles;performance;technology;composites;deposition;behavior;layer

用P507D萃取剂萃取铟的再使用性能的研究

许秀莲 , 唐冠中

稀有金属 doi:10.3969/j.issn.0258-7076.2000.05.020

对 P507D 的负载有机相进行了反萃及再生研究.采用 3 mol/L HCl+1 mol/L ZnCl2 的混合液作为反萃取剂,以 O/A=1:1 的相比,反萃三次,99% 以上的铟得到反萃.空载有机相进一步经 HCl 再生后,返回使用.在相同条件下,与 P204 进行了对比试验,证实 P507D 具有良好的再使用性能.

关键词: 酸性磷类萃取剂 , 铟 , 萃取 , 溶剂萃取

AZ91 D镁合金表面Ni-P/Ni-Sn-P双镀层的制备与性能研究

刘秋月 , 张修庆 , 浦海洲 , 徐金鹏

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2015.02.007

目的：提高AZ91 D镁合金的耐腐蚀性能,扩大其应用范围。方法先在AZ91 D镁合金表面化学镀Ni-P镀层,再化学镀Ni-Sn-P镀层,形成Ni-P/Ni-Sn-P双镀层。研究Ni-P/Ni-Sn-P双镀层的表面形貌和耐腐蚀性能,并与Ni-P单镀层进行对比。结果 Ni-P/Ni-Sn-P双镀层表面分布更均匀平整,缺陷较少,孔隙率较低,具有无定形结构。二次Ni-Sn-P镀层的腐蚀电位约为-0.77 V,略低于一次化学镀Ni-P层(约-0.68 V),两镀层间的电位差使得其构成了微腐蚀电偶,Ni-P层作为阴极,Ni-Sn-P层作为阳极,阳极优先被腐蚀。结论 Ni-P/Ni-Sn-P双镀层的Ni-Sn-P外层能为Ni-P内层提供阴极保护,较好地横向分散腐蚀电流,从而增强AZ91 D镁合金基底的耐腐蚀性能。

关键词: AZ91 D镁合金 , Ni-P镀层 , Ni-P/Ni-Sn-P双镀层 , 耐腐蚀性能

AZ91D镁合金化学镀Ni-P的沉积机制

钱建刚 , 滕晓明 , 刘玉芬 , 黄巍

稀有金属材料与工程

利用金相显微镜(OM)、扫描电子显微镜(SEM)及能谱(EDS)等分析测试手段,研究AZ91D镁合金上直接化学电镀Ni-P的沉积过程.结果表明:活化后的表面上不同位置处最初沉积Ni的过程不同.在活化后的块状物上,由于氟化物的溶解,Mg置换出Ni,因此最初"块状物"上只有Ni沉积,没有P.β相和α相边缘则是由于其电位较高,附近的Ni2+得到Mg失去少量电子后还原沉积出高催化活性的Ni核,催化了次亚磷酸钠还原沉积出P和Ni.

关键词: AZ11D镁合金 , Ni-P镀层 , 沉积

AZ91D镁合金化学沉积Ni-P合金镀层工艺研究

陈婷婷 , 亢淑梅 , 赵超山 , 李欣妍 , 陈华

电镀与精饰 doi:10.3969/j.issn.1001-3849.2017.04.002

为提高镁合金的耐蚀性,以AZ91D镁合金为基体,采用化学沉积方法制备了Ni-P合金镀层.利用维氏硬度仪、扫描电镜、能谱分析仪及Autolab电化学工作站等检测方法,分析了镀层的硬度、显微形貌、镀层成分及耐蚀性.结果表明,HF质量浓度为200 mL/L、活化t为15 min、镀液pH为7.30时能有效提高镀层的耐蚀性.

关键词: 化学沉积Ni-P合金 , 镁合金 , 活化 , pH , 耐蚀性