热喷涂Zn-AI-Mg-RE涂层组织及耐蚀性能研究

采用高速电弧喷涂(HVAS)及粉芯丝材技术制备了Zn-Al-Mg-RE涂层.结合SEM、XRD、电位-时间曲线及极化曲线等试验方法对涂层腐蚀前后表面形貌、相组成、电化学腐蚀性能进行了表征和测试.结果表明,制备的Zn-Al-Mg-RE涂层组织致密,与基体结合良好,涂层中存在提高耐蚀性的尖晶石氧化物;涂层腐蚀过程中,表面的微观孔隙能够被自身的腐蚀产物有效堵塞,从而阻止腐蚀反应的进行,其自封闭特性起到了积极作用.     

Zn-Al-Mg-RE涂层与有机涂层协同性的研究

采用高速电弧喷涂技术在Q235钢表面制备Zn-Al-Mg-RE涂层后涂装海洋防腐有机涂层,构建一种新型的长效防腐复合涂层.同时,在Q235钢基体和高速电弧喷涂Al涂层表面涂装该有机涂层作为对比试样,观察了在5wt%NaCl溶液中常温浸泡212天后各体系微观孔隙处腐蚀产物的微观结构,用电化学交流阻抗谱技术研究了微观孔隙形成过程中金属涂层与有机涂层之间的协同性.结果表明,Zn-Al-Mg-RE涂层体系微观孔隙中形成的腐蚀产物微观结构致密;Zn-Al-Mg-RE涂层与该有机涂层具有最好的协同性.     

不同体系中缺陷大小对有机涂层失效形貌的影响

分别在刷涂于铁基体、Al电弧喷涂层和Zn-Al-Mg-RE电弧喷涂层表面的有机涂层中制备了大小不同的人工缺陷,观察了各体系进行电化学交流阻抗(EIS)测试后有机涂层的失效形貌及缺陷处腐蚀产物的微观结构,并分析了各体系的失效机制.结果表明,对于在铁基体和Al电弧喷涂层表面刷涂有机涂层体系,缺陷尺寸越小,有机涂层失效越严重,主要是因为缺陷大小影响腐蚀产物向腐蚀介质中的扩散造成的;对于在Zn-Al-Mg-RE电弧喷涂层表面刷涂有机涂层的体系,缺陷尺寸大小对有机涂层失效形貌的影响不大,主要是因为在人工孔隙中生成了微观结构致密的腐蚀产物造成的.     

一种用于研究腐蚀环境中Zn-Al-Mg-RE涂层自封闭特性的新方法

采用自主研发的装置结合离子色谱仪研究了Zn-Al-Mg-RE涂层的自封闭特性,同时通过SEM观察了该涂层腐蚀前后表面腐蚀产物的微观形貌.结果表明:随着腐蚀时间的增加,单位时间氯离子渗透通过Zn-Al-Mg-RE涂层的量不断地降低,超过504 h后,单位时间氯离子渗透通过该涂层的量几乎为零;此时涂层表面被非常致密的腐蚀产物所覆盖.由此说明本文的研究方法能够更直观的证明Zn-Al-Mg-RE金属涂层具有自封闭特性.     

金属喷涂工艺与设备

20093268热喷涂Zn-Al-Mg-RE涂层组织及耐蚀性能研究/刘燕…//金属热处理.-2008,33(11):52~54采用高速电弧喷涂(HVAS)及粉芯丝材技术制备了Zn-Al-Mg-RE涂层。结合SEM、XRD、电位-时间曲线及极化曲线等试验方法对涂层腐蚀前后表面形貌、相组成、电化学腐蚀性能进行了表征和测试。结果表明,制备的Zn-Al-Mg-RE涂层组织致密,与基体结合良好,涂层中存在提高耐蚀性的尖晶石氧化物;涂层腐蚀过程中,表面的微观孔隙能够被自身的腐蚀产物有效堵塞,从而阻止腐蚀反应的进行,其自封闭特性起到了积极作用。图6表1参620093269铁基非晶纳米晶涂层组织与冲蚀性能分析/梁秀兵…//焊接学报.-2009,30(2):61~64利用高速电弧喷涂技术成功制备了FeCrBSi Mn-NbY系和FeBSi NbCr系非晶纳米晶涂层。采用扫描电镜、X射线衍射仪等设备对涂层的组织结构进行了表征,重点分析了非晶的形成机制,并对涂层的高温冲蚀性能进行了研究。结果表明,FeCrBSi MnNbY系和FeBSi NbCr系涂层的组织主要由非晶相和α(Fe,Cr)相纳米晶组成;两种涂层结构致密,组织均匀,孔...     

金属喷涂工艺与设备

20093268热喷涂Zn-Al-Mg-RE涂层组织及耐蚀性能研究/刘燕…//金属热处理.-2008,33(11):52~54采用高速电弧喷涂(HVAS)及粉芯丝材技术制备了Zn-Al-Mg-RE涂层。结合SEM、XRD、电位-时间曲线及极化曲线等试验方法对涂层腐蚀前后表面形貌、相组成、电化学腐蚀性能进行了表征和测试。结果表明,制备的Zn-Al-Mg-RE涂层组织致密,与基体结合良好,涂层中存在提高耐蚀性的尖晶石氧化物;涂层腐蚀过程中,表面的微观孔隙能够被自身的腐蚀产物有效堵塞,从而阻止腐蚀反应的进行,其自封闭特性起到了积极作用。图6表1参620093269铁基非晶纳米晶涂层组织与冲蚀性能分析/梁秀兵…//焊接学报.-2009,30(2):61~64利用高速电弧喷涂技术成功制备了FeCrBSi Mn-NbY系和FeBSi NbCr系非晶纳米晶涂层。采用扫描电镜、X射线衍射仪等设备对涂层的组织结构进行了表征,重点分析了非晶的形成机制,并对涂层的高温冲蚀性能进行了研究。结果表明,FeCrBSi MnNbY系和FeBSi NbCr系涂层的组织主要由非晶相和α(Fe,Cr)相纳米晶组成;两种涂层结构致密,组织均匀,孔...     

高速电弧喷涂制备锌基涂层在含钠和氯离子环境下的腐蚀行为(英文)

利用高速电弧喷涂技术在A3钢基体上制备了厚度约200μm的Zn-15Al和Zn-Al-Mg-RE涂层。利用铜加速盐雾试验考察了两种涂层在含钠和氯粒子环境下的腐蚀情况。利用扫描电镜研究了涂层在腐蚀前后的形貌变化规律,利用XRD分析了腐蚀产物的相结构,利用动电位极化曲线研究了两种涂层在3.5%氯化钠溶液中的腐蚀行为。结果表明,在含钠和氯粒子环境下,Zn-Al-Mg-RE涂层耐腐蚀性能优于Zn-15Al涂层。     

高速电弧喷涂层的组织和性能

对比研究了新型高速电弧喷涂层和普通电弧喷涂层的表面形貌、显微组织和界面合金元素分布,测定了不同工艺条件下喷涂层的硬度、孔隙率和拉伸结合强度,并考察了三种材料电弧喷涂层的磨损性能,探讨了高速电弧喷涂层和普通电弧喷涂层组织、性能差异的原因。     

基于电化学阻抗谱的Zn及Zn-Al涂层的自封闭机理研究

目前，热喷涂Zn—Al合金涂层已替代Zn及Al涂层，成为海洋环境下钢结构件腐蚀防护的首选方法。使用高速电弧喷涂和粉芯丝材技术制备了Zn—Al涂层，采用电化学阻抗谱法(EIS)，结合涂层腐蚀产物X-射线衍射(XRD)及涂层腐蚀后表面形貌分析，对比研究了Zn及Zn—Al涂层的耐蚀性，并探讨了涂层的自封闭机理。结果表明，活化溶解是Zn涂层腐蚀的主要机制，在腐蚀过程中Zn涂层表现出自封闭作用，但由于腐蚀产物是疏松的，其自封闭效果微弱；Zn—Al涂层表现出了更好的耐蚀性，涂层表现出一定的自封闭效果。     

高速电弧喷涂Fe-Al复合涂层高温腐蚀研究

研究了高速电弧喷涂（HVAS）的几种Fe-Al复合涂层的耐高温腐蚀行为,用SEM观察分析了腐蚀表面的形貌和成分、涂层截面的组织结构.结果表明：随温度升高,4种Fe-Al涂层的腐蚀增重都增加,添加Cr3C2比添加WC或不添加任何增强的Fe-Al涂层有更高的耐腐蚀性. Fe-Al/Cr3C2涂层外表面形成了铝和铬的氧化物,阻止了氧化的进一步进行. 关键词：高速电弧喷涂;高温腐蚀;Fe-Al涂层     

Fretting Corrosion Behavior of Zn-Al-Mg-RE Coating under Dry Friction and NaCl Solution

The fretting behavior of Zn-Al-Mg-RE coating prepared by high velocity arc spraying was studied for the first time in this paper.All specimens were fretted in air and 3.5%NaCl solution independently.The worn surfaces of the coating were investigated by scanning electron microscopy and X-ray energy dispersive spectroscopy.Fretting tests have shown that friction coefficient in 3.5%NaCl solution was similar to dry condition for Zn-Al-Mg-RE coating.Study of worn surfaces revealed the main mechanism in dry friction was the oxidative wear;while in 3.5%NaCl solution,the main mechanisms were delamination process and abrasive wear.     

电弧喷涂Zn-Al伪合金涂层耐腐蚀性能研究进展

通过在钢基体表面制备涂层可以很好地延长钢铁材料的服役时间,减少因腐蚀造成的重大事故和人员伤亡。相较于传统的纯Zn涂层、纯Al涂层以及Zn-Al合金涂层,Zn-Al伪合金涂层能够为基体材料提供长久有效的腐蚀防护,在钢铁材料的腐蚀防护中具有巨大的应用潜力。简述了Zn-Al伪合金涂层电弧喷涂制备工艺的特点;介绍了Zn、Al、Zn-Al合金及Zn-Al伪合金涂层在模拟海洋环境下的腐蚀防护原理;在此基础上从组分、喷涂工艺参数(喷涂距离、喷涂电流和喷涂电压)、元素掺杂(Mg、Si及Re)及后处理工艺(封孔、激光重熔)等角度,论述了其对Zn-Al伪合金涂层耐蚀性的影响;讨论了Zn-Al伪合金涂层防腐体系在桥梁、海洋钢结构件、地下运输管道中的应用现状;最后总结了目前研究工作中存在的挑战,提出了电弧喷涂Zn-Al伪合金涂层尚需深入研究的重点问题,为提高钢铁材料使用寿命提供了参考。     

Influence of the spray velocity on arc-sprayed coating structures

Thermal spray processes such as plasma spraying and HVOF have gained markets due to a steady process of development of materials and equipment. One disadvantage of thermal spray processes is that costs must be competitive compared to techniques such as PTA and electroplating. In order to reduce costs, the more economical spray processes like conventional wire flame spraying, as well as arc spraying, are becoming more popular. There are modern arc spray gun designs on the market that meet the requirements of modern coating properties, for example aviation overhaul applications as well as the processing of cored wires. Nevertheless, the physical basis of arc spraying is well known. The aim of the present investigation is to show how the influence of spray velocity (not particle velocity) affects coating structure with respect to arc spray parameters.     

高速火焰电弧复合喷涂枪制备3Cr13涂层的性能

高速火焰电弧(HVAF-ARC)复合喷涂枪是高速火焰喷涂枪和电弧喷涂枪的结合体,利用产生的高速燃气来雾化加速电弧喷涂过程中产生的熔融粒子,提高了喷涂粒子的飞行速度,降低了粒子的氧化,可高效制备优质的涂层。文中利用自主开发的新型高速火焰电弧复合喷涂枪和普通高速电弧喷涂枪,分别在钢基体上制备了3Cr13涂层,通过对涂层的性能检测发现,复合喷涂枪所制备涂层的氧元素含量和孔隙率都比普通高速电弧喷涂枪制备的涂层低,分别降低了33%和49%,硬度提高了12%,复合喷涂枪制备涂层的性能得到较大的提高。     

Effects of spray conditions on coating formation by the kinetic spray process

The kinetic spray coating process involves impingement of a substrate by particles of various material types at high velocities. In the process, particles are injected into a supersonic gas stream and accelerated to high velocities. A coating forms when the particles become plastically deformed and bond to the substrate and to one another upon collision with the substrate. Coating formation by the kinetic spray process can be affected by a number of process parameters. In the current study, several spray variables were investigated through computational modeling and experiments. The examined variables include the temperature and pressure of the primary gas, the cross-sectional area of the nozzle throat, the nozzle standoff distance from a substrate, and the surface condition of nozzle interior and the powder gas flow. Experimental verification on the effects of these variables was performed primarily using relatively large-size aluminum particles (63–90 μm) as the feedstock material. It was observed that the coating formation is largely controlled by two fundamental variables of the sprayed particles: particle velocity and particle temperature. The effects of different spray conditions on coating formation by the kinetic spray process can be generally interpreted through their influences on particle velocity and/or particle temperature. Though it is limited to accelerate large particles to high velocities using compressed air or nitrogen as carrier gas, increasing particle temperature provides an additional means that can effectively enhance coating formation by the kinetic spray process.     

Sliding wear behavior of high velocity arc sprayed Fe-Al coating

The friction and wear behavior of Fe-Al intermetallics based coating produced by high velocity are spraying technique under dry sliding at room temperature were investigated using a ball-on-disc tribotester. The effect of sliding speed on friction coefficient and wear of the coating was studied. The worn surface of the coating was analyzed by scanning electron microscope (SEM) to explore sliding friction and wear mechanism. The results show that the variations of friction coefficient can be divided into three distinct steps during the trail. Both the friction coefficient and the wear of the coating increase with increased sliding speed due to accelerated crack propagation rate and lamellar structure with poor ductility of the coating. The coating surface is subjected to alternately tensile stress and compression stress during sliding wear process, and the predominant wear mechanism of the coatings appears to be brittle fracture and delamination.     

镁合金表面加弧辉光离子渗镀Ti的腐蚀性能研究

加弧辉光离子渗镀技术将辉光放电与弧光放电有机地结合起来,利用辉光放电空心阴极效应使工件迅速升温,同时在真空容器壁上设置一个或多个金属阴极电弧靶源,利用真空电弧放电而不断地发射出高能量、高电流密度、高离化率的欲渗金属离子流,依靠扩散和离子轰击作用快速渗入工件表面层,在工件表面可以形成渗层、镀层、渗镀结合层.在实验条件下对镁合金AZ91表面渗镀了Ti,采用极化曲线测试和盐雾实验分析了处理后材料的腐蚀行为,用扫描电镜（SEM）分析了Ti镀膜的表面形貌,用电子衍射光谱（EDS）和辉光放电光谱仪（GDS）分析了表面化学成分分布.结果表明渗镀Ti显著提高了AZ91的耐腐蚀性.     

高速电弧喷涂铝涂层性能试验研究

本文对高速电弧喷涂铝涂层和普通电弧喷涂铝涂层进行了对比试验研究。结果表明：高速电弧喷涂粒子束更加集中,粒子的飞行速度显著提高,粒子的雾化效果明显改善。高速电弧喷滁铝涂层具有结合强度高、硬度高、孔隙率低、组织致密等特点。