含铁炉尘回收利用的锈化球方法

介绍了含铁炉尘回收利用新方法：通过掺入铁粉污泥和锈化剂锈化固结成球返回烧结使用。

配加锈化球烧结试验研究

对配加锈化球烧结进行了基准试验和不同配比的系列试验。试验证明 ,混匀料中配加 10 %的锈化球 ,试验的判定指标可达到最佳值 ;锈化球可以取代粗粉保证料层具有良好的透气性 ;实际生产时 ,建议锈化球的粒度须小于 8mm ,其中 1～ 6mm占 80

锈化拉拔工艺中大角度润滑区拉丝模的试用

介绍经试验确定的比较适合锈化（黄化）拉拔工艺的拉丝模润滑区角度以及大角度拉丝模在锈化拉拔中的试用情况。

焊丝用盘条表面锈化处理工艺研究

介绍焊丝用盘条拉拔前表面锈化处理工艺流程。工艺控制要点:酸洗过程中打开捆扎线,3 m穿线杠每吊质量控制在1 000 kg左右;控制Fe2+质量浓度不超过200 g/L,酸洗温度控制在60℃左右,控制硫酸质量浓度约60g/L,缓蚀剂的体积应为酸液体积的0.10%～0.15%;高压水的pH一般为7～8,压强不小于3 MPa;锈化时间随环境温度的变化而变化,为保证锈化质量,一般水雾流量为1.5 m3/h;涂石灰一般需要5～8次,pH一般不小于11,石灰溶液温度控制在80～100℃,为增强石灰涂层的吸附能力,可以在石灰溶液里加入适量的亚硝酸钠。表面锈化处理工艺参数优化后,盘条拉拔时总压缩率达97.7%,满足小规格焊丝生产要求。

复合锈化固结法处理球团返矿试验研究

本文针对球团返矿回收利用难的问题,采用在球团返矿中配加赤铁矿调节粒度组成,并添加有机黏结剂、无机添加剂及铸铁粉压制成型的复合锈化固结的方法制备冷固结干球,并对添加剂配比、焖料时间、养护时间等工艺参数进行相关试验研究。结果表明:通过复合锈化固结法制备的冷固结干球具有抗压强度高、固结时间短、低温还原粉化指数较好以及优异的还原膨胀指数,不仅满足了高炉的使用需求,同时也为球团返矿乃至含铁冶金废料的利用提供了处理工艺参考。

LNG船生产无锈化工艺的研究与实施

EM/MOL LNG系列船的船东提出在该系列船实施生产全过程无锈化工艺的要求。根据船东要求,公司策划了在76 000t散货船的HW08PS分段进行无锈化工艺模拟试验。根据试验中取得的经验,同时通过与国内外船厂以及船东等进行的交流学习,最终制订了生产的无锈化工艺并在载体船舶上成功实施。

常温快速化锈防锈剂的制备与应用

介绍了常温快速化锈防锈剂的配方、生产方法、产品特征及其使用情况。

铁锈转化剂的专利研究

铁锈转化剂是利用其与钢铁表面锈层反应生成稳定的络合物、螯合物,形成化学性能稳定的致密保护层来达到化锈防锈目的的一种防腐材料。在简述铁锈转化剂研究背景的基础上,对近年来有关铁锈转化剂的专利研究情况进行了综述。

铁精矿金属化炉料的实验室研究

文章介绍了针铁矿精矿金属化炉料的实验室研究结果。铁精矿先经还原焙烧一磁选,然后锈化固结成型。试验结果表明,用这种工艺处理难选复杂铁矿石是一种较好的办法。

含铁废料快速冷固成型固结机理及影响因素

针对转炉泥、除尘灰等含铁废料冷固成型固结速度慢,团块强度低的问题,采用自行开发的新型锈化剂进行压团试验,研究团块快速冷固成型固结机理及其影响因素。研究结果表明自行开发的新型锈化剂可加快团块的固结速度,提高团块的强度,在金属铁含量为5%、压团原料水分为10%、压团压力为300 kg/cm2的条件下自然养护24 h,团块的抗压强度可达2 000 N/P以上。

Evolution of microstructure and mechanical properties in multi-layer 316L-TiC composite fabricated by selective laser melting additive manufacturing

In this study,the microstructure and mechanical properties of a multi-layered 316L-TiC composite material produced by selective laser melting(SLM)additive manufacturing process are investigated.Three different layers,consisting of 316L stainless steel,316L-5 wt%TiC and 316L-10 wt%TiC,were additively manufactured.The microstructure of these layers was characterized by optical microscopy(OM)and scanning electron microscopy(SEM).X-ray diffraction(XRD)was used for phase analysis,and the mechanical properties were evaluated by tensile and nanoindentation tests.The microstructural observations show epitaxial grain growth within the composite layers,with the elongated grains growing predominantly in the build direction.XRD analysis confirms the successful incorporation of the TiC particles into the 316L matrix,with no unwanted phases present.Nanoindentation results indicate a significant increase in the hardness and modulus of elasticity of the composite layers compared to pure 316L stainless steel,suggesting improved mechanical properties.Tensile tests show remarkable strength values for the 316L-TiC composite samples,which can be attributed to the embedded TiC particles.These results highlight the potential of SLM in the production of multi-layer metal-ceramic composites for applications that require high strength and ductility of metallic components in addition to the exceptional hardness of the ceramic particles.

The Formation of Colored Film on Stainless Steel and the Study for Surface Structure

This paper discusses the coloration process on the stainless steel and the properties of the film. The compositions, morphology and structure of colored films on stainless steel are studied by using SEM,AES,AFM,STM. The diffusion controlled mechanisms of films and calculation formula of surface electropotential difference are discussed.

Probabilistic durability assessment approach of deteriorating RC bridges

A stochastic finite element computational methodology for probabilistic durability assessment of deteriorating reinforced concrete（RC） bridges by considering the time-and space-dependent variabilities is presented.First,finite element analysis with a smeared cracking approach is implemented.The time-dependent bond-slip relationship between steel and concrete,and the stress-strain relationship of corroded steel bars are considered.Secondly,a stochastic finite element-based computational framework for reliability assessment of deteriorating RC bridges is proposed.The spatial and temporal variability of several parameters affecting the reliability of RC bridges is considered.Based on the data reported by several researchers and from field investigations,the Monte Carlo simulation is used to account for the uncertainties in various parameters,including local and general corrosion in rebars,concrete cover depth,surface chloride concentration,chloride diffusion coefficient,and corrosion rate.Finally,the proposed probabilistic durability assessment approach and framework are applied to evaluate the time-dependent reliability of a girder of a RC bridge located on the Tianjin Binhai New Area in China.

镁带表层黑色物质是什么?

实验室放置在空气中的镁带,会逐渐失去金属光泽并形成黑色表层。随着放置时间越长,其表层黑色越深。这黑色物质是什么?它是怎样形成的呢?我们查阅了一些化学教材和参考书,它们都没有对此问题进行解释。因为镁及其常见化合物[如MeO、Mg（OH）2、MgCl2、MgS、Mg3N2、……]中没有一种物质是黑色的,

金属家具:阳刚之中伴随几分柔情(二)

选购小贴士：管件之间的部位不允许有漏焊、开焊、虚焊,不能出现气孔、焊穿和毛刺等缺陷。金属部件和钢管的铆接要牢固,不能出现松动现象。铆钉帽要光滑平坦,无毛刺,无锉伤。家具打开使用时,四脚落地平稳一致,折叠产品要保证折叠灵活,但不能有自行折叠现象。保养方法运输过程中尽量避免磕碰,防止表面损坏导致柜体锈化。放置时要轻拿轻放,保持水平,并且要与墙面保持一定距离。放置的地面要保持干燥,防止受潮、碱化。

Effect of intermetallic compounds on heat resistance of hot roll bonded titanium alloy-stainless steel transition joint

The effect of intermetallic compounds on the heat resistance of transition joint was investigated. The experiment of post-weld heat treatment for the hot roll bonded titanium alloy-stainless steel joint using nickels interlayer was carried out, and the interface microstructure evolution due to heat treatment was presented. There was not found significant interdiffusion at stainless steel/nickel interface, when the specimens were heat treated in the temperature range of 600-800 °C for 10 and 30 min, while micro-cracks occurred at the stainless steel/nickel interface heat treated at 700 °C for 30 min. The thickness of intermetallic layers at nickel/titanium alloy interface increased at 600 °C, and micro-cracks occurred at 700 and 800 °C. The micro-cracks occurred between intermetallic layers or between intermetallic layer and nickel interlayer as well. The tensile strength of the transition joint decreased with the increase of heat treatment temperature or holding time.

Electrochemical corrosion behavior of bulk ultra-fine grained Fe-Ni-Cr alloy

The corrosion behavior of bulk ultra-fine grained（UFG） Fe-Ni-Cr alloy prepared by equal-channel angular pressing technique was investigated in 0.25 mol/L Na2SO4＋0.05 mol/L H2SO4 solution by electrochemical measurements.As compared to the coarse grained（CG） counterpart,the UFG alloy exhibits an acceleration of the active dissolution and a shrunk passive region with a higher passive current.The Mott-Schottky analysis in conjunction with the point defect model indicates mat the donor diffusion coefficient in the passive films of the UFG sample increases greatly to one magnitude order higher and the donor density is slightly lower than that of the CG sample.

黄鹤楼完成30年首次大修

武汉黄鹤楼在复建30年后完成了首次大修。历经两年多时间,首次大修已宣告结束,黄鹤楼将再次揭开面纱。黄鹤楼于1985年复建完成后正式开放。2013年初冬,数位建筑方面的专家齐聚黄鹤楼公园内,黄鹤楼迎来首次大修,12万片琉璃瓦逐一更换。大修后的黄鹤楼重现了"清江度暖日,黄鹤弄晴烟"的景象,主楼依旧是橙色琉璃瓦,修旧如旧。