沉积工艺对磁控溅射 TiAlN 薄膜微观形貌及性能的影响

采用非平衡磁控溅射技术在Q235钢基体上制备了TiAlN薄膜,研究了沉积工艺参数对薄膜微观形貌、力学性能及耐腐蚀性能的影响规律,通过扫描电镜、纳米力学探针、划痕测试仪对薄膜的微观形貌和力学性能进行表征,并利用盐雾试验和电化学极化测试研究了薄膜在含Cl-环境中的腐蚀行为。结果表明,随着N_2流量的升高,TiAlN薄膜的硬度和结合力先升高后降低,当N_2流量为10sccm时,薄膜具有最高的硬度和结合力,分别为30.7GPa和44.2N,其耐腐蚀性能最优。随着Al靶功率的增加,薄膜的硬度和结合力先增大后减小,当Al靶功率为90W时,薄膜的硬度和结合力达到了最大值,分别为28.6GPa和38.4N,具有最佳的抗腐蚀性能。随着基体温度的升高,薄膜的硬度和结合力逐渐增大,基体温度低于300℃时,增大幅度较明显,基体温度高于300℃时,二者增加幅度趋于平缓,薄膜表现出优异的耐腐蚀性能。     

非平衡磁控溅射 TiAlN 薄膜的抗高温氧化行为研究

采用非平衡磁控溅射技术在Q235钢基体上制备了TiAlN薄膜,通过精密电子天平、纳米力学探针、划痕测试仪及扫描电镜等测试分析,研究了薄膜氧化动力学行为、薄膜显微硬度和结合力的变化规律及不同温度下氧化后薄膜表面形貌演变规律,探讨了Ti AlN薄膜的抗高温氧化机制。结果表明,在700℃以上TiAlN薄膜的氧化动力学行为服从抛物线规律。随着氧化温度的升高,薄膜的显微硬度和结合力逐渐下降,当氧化温度升高到800℃时,薄膜具有较高的显微硬度和结合力,分别为19.3 GPa和32.1 N,表现出良好的抗高温氧化性能。当氧化温度升高到900℃时,薄膜表面出现了明显的鼓包和裂纹,此时薄膜发生了严重氧化,薄膜已失去对基体的保护作用。     

烧结Nd-Fe-B磁体表面多弧离子镀Ti(Al)N镀层性能研究

以烧结Nd-Fe-B磁体为基体,采用多弧离子镀,通过调节氮分压比获得不同颜色和性能的TiN和TiAlN镀层薄膜。利用X射线衍射仪、金相分析技术、盐雾试验和维氏硬度计等研究镀层薄膜的宏观和微观形貌、维氏硬度和耐腐蚀性能。研究结果表明,TiN和TiAlN镀层薄膜都能够极大地提高烧结Nd-Fe-B磁体的防腐蚀性能;TiN镀层中,氮分压比增加会使TiN镀层薄膜的颜色加深,氮氩比为1∶1时镀层薄膜的结合力和防腐蚀性能最好;而TiAlN镀层的结合力和耐腐蚀性能明显优于TiN镀层。     

超音速火焰喷涂WC-10Co4Cr涂层在含Cl~-环境中的腐蚀行为

在Q235钢表面,采用超音速火焰喷涂(HVOF)技术制备了WC-10Co4Cr金属陶瓷涂层。利用扫描电镜(SEM)、能谱仪(EDS)、万能试验机、显微维氏硬度计等设备对涂层的显微组织、成分、力学性性能进行研究。采用盐雾试验和电化学极化测试技术研究了WC-10Co4Cr涂层在含Cl~-环境中的腐蚀行为与电化学特性。结果表明,WC-10Co4Cr涂层组织均匀致密,涂层力学性能优异,结合强度平均值为71.03MPa,涂层平均显微硬度为1290.74HV0.3。盐雾试验384h后WC-10Co4Cr涂层表面生成了致密的腐蚀产物层,有效阻止了腐蚀介质的侵入,具有良好的长期防护效果。电化学测试结果表明,在含Cl~-环境中,WC-10Co4Cr涂层具有优异的耐腐蚀性能,能够对基体起到有效的保护作用。     

磁控溅射表面镀膜对Nd_2Fe_(14)B稀土永磁体抗腐蚀性能的影响

在Nd_2Fe_(14)B稀土永磁体基体表面,采用磁控溅射(直流+射频)技术制备了Ti/Ni,Ti/Al和Al/Ni等二元合金薄膜和Ti/Al/Ni三元合金薄膜。并通过中性盐雾试验、腐蚀失重计算、电化学腐蚀试验、金相观察等方式,对比研究了不同表面处理对Nd_2Fe_(14)B稀土永磁体基体抗腐蚀性能的影响,并构建了腐蚀模型。研究发现:Ti/Ni,Ti/Al和Al/Ni等二元合金薄膜和Ti/Al/Ni三元合金薄膜均有效地提高了Nd_2Fe_(14)B稀土永磁体基体耐中性盐雾腐蚀和电化学腐蚀的能力;Ti/Al/Ni三元合金薄膜较Ti/Ni,Ti/Al和Al/Ni等二元合金薄膜有更优良的综合耐腐蚀性能,其磁控溅射工艺参数为:Ar流量60 sccm,基片温度常温,Ni,Al,Ti的溅射功率都为250 W,基片转速20 r·min~(-1),镀膜均速0.3 nm·s~(-1),总计溅射时间1 h。     

磁控溅射工艺参数对TiAlN薄膜结构和性能影响规律研究

采用XRD、SEM、纳米压痕仪、纳米划痕仪等分析了磁控溅射工艺参数对TiAlN薄膜物相、微观组织、力学性能及结合力的影响规律。结果表明，所有样品生成相均为面心立方的TiAlN,且在(111)晶面择优生长，薄膜表面形成三棱锥状密排晶粒。选定硬度与结合力两个指标对TiAlN薄膜进行评价，通过正交实验发现，硬度与结合力的最优工艺参数均为基底偏压-100 V,工作气压0.3 Pa,溅射电流8 A,氮流量40 sccm。     

N_2气压对CrWN涂层结构及性能影响

采用电弧离子镀技术制备CrWN涂层,研究沉积N_2气压对CrWN涂层的微观结构、形貌、沉积速率、硬度及摩擦学性能的影响。利用SEM,XRD和XPS检测/表征CrWN涂层的晶体结构、形貌及成分;利用硬度计、磨损仪和轮廓仪分别测试CrWN涂层的硬度、摩擦因数及磨损率。结果表明,CrWN涂层为面心立方结构,随着沉积N_2气压的升高,CrWN涂层的(111)和(200)衍射峰强度明显增强,涂层表面大颗粒数量和尺寸逐渐减小,沉积速率最高1.13mm/h;当N_2气压由0.5 Pa升高到1.0 Pa时,CrWN涂层的显微硬度(HV)由1 900增大到2 010,随着N_2气压进一步升高,CrWN涂层硬度有所降低;CrWN涂层平均摩擦因数稳定在0.5左右,在N_2气压2.0 Pa时磨损率达到最大值5.4×10~(-7)mm~3/(N·m),明显低于Cr N涂层的摩擦因数0.7和磨损率6.7×10~(-7)mm~3/(N·m)。     

FeSiAl电磁屏蔽涂层的腐蚀行为对吸波性能的影响

以在Q235冷轧钢板表面涂敷的FeSiAl电磁屏蔽涂层为研究对象，通过改变固化条件，探究了电磁屏蔽涂层的最优固化环境.同时，运用中性盐雾试验、电磁屏蔽性能测试和电化学阻抗试验，研究了自然条件固化后涂层的吸波性能和耐蚀性能随盐雾周期不同的变化规律.结果表明，电磁场下固化会损害涂层的腐蚀屏蔽性.吸波剂含量的增加不利于提升涂层的吸波性能，同时也会损害涂层的腐蚀屏蔽性.长期盐雾试验后，涂层的吸波性能随腐蚀屏蔽性的降低而下降.      

含氯离子环境下锌铝伪合金涂层的耐蚀性及电化学特性

采用盐雾试验和电化学阻抗谱测试技术研究了纯锌和锌铝伪合金涂层在含氯离子环境中的腐蚀行为和电化学特性,通过扫描电镜、X射线物相分析等手段研究了原始涂层及腐蚀后的表面形貌和腐蚀产物的相结构,并对两种涂层的腐蚀机理进行了初步的探讨.随着盐雾时间的增加,纯锌涂层表面逐渐生成疏松多孔的胞状腐蚀产物层,主要腐蚀产物为Zn₅(OH)₈Cl₂H₂O、ZnO和Zn₅(CO₃)₂(OH)₆,盐雾试验达到768 h后腐蚀产物层局部区域发生龟裂.锌铝伪合金涂层表面生成致密的腐蚀产物层,主要为Zn₅(OH)₈Cl₂H₂O、Zn_0.71Al_0.29(OH)₂(CO₃)_0.145·xH₂O及ZnAl₂O₄.电化学阻抗谱测试结果表明:随着盐雾时间的延长,两种涂层的电荷转移电阻均逐渐增大,但锌铝伪合金涂层的阻抗要明显大于纯锌涂层,表现出了更好的耐蚀性.      

439超纯铁素体不锈钢耐蚀性评价

通过盐雾试验、电化学试验和FeCl3点腐蚀试验,并结合扫描电镜,对比研究了439超纯铁素体不锈钢和430普通铁素体不锈钢的耐腐蚀性能。结果表明,碳、氮间隙元素极低的439超纯铁素体不锈钢耐点蚀性能明显优于430普通铁素体不锈钢,虽然430钝化膜修复能力较强,但点腐蚀速率也较快;430不锈钢具有严重的晶间腐蚀敏感性,同样,430普通不锈钢在干湿加速盐雾试验中发生了严重腐蚀,439超纯铁素体不锈钢在上述腐蚀试验中均表现出轻微的腐蚀。可见在430普通不锈钢基础上降低碳、氮间隙元素含量,同时加入钛稳定化元素,使其耐腐蚀性能大幅提高。     

Post treatment of silane and cerium salt as chromate replacers on galvanized steel

A complex film on hot-dip galvanized steel sheet (HDG) was prepared by immersing the sheet in 0.1wt.% Ce(NO3)3 solution and 5vol.% silane solution in turn. The corrosion protection of the complex film was evaluated by potentiodynamic linear polarization(LPR), electrochemical impendence spectra (EIS) and natural salt spray (NSS) tests and compared with that of single cerium film and silane film. The results showed that, the presence of these films on the zinc coating hindered corrosion reaction by reducing the rate of both anodic and cathodic reaction in the corrosion process, and the corrosion protection of the complex film was much better than that of single cerium film or silane film and closed to that of chromate film, because the polarization resistance Rp and electrochemical impendence were increased markedly. Microstructure and chemical composition of these pretreated films were also investigated by scanning electron microscopy (SEM) and AES.     

Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/TiO2 Composite Film

The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray spectrometer (EDX).The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet, in 0. 5 mol/L NaCl solution, was studied by potentiodynamic polarization, salt spray test and electrochemical impedance spectroscopy (EIS) techniques. The selfcorrosion current density (icorr) and the polarization resistance (Rp) of Ni-P/TiO2 film are 0. 22 μA/cm2 (about 14% of that of Ni-P coating), and 120 kΩ·cm2 (about 2 times of that of Ni-P coating), respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating, and the composite film increases the corrosion resistance of NdFeB magnet markedly.     

Effects of lanthanum addition on corrosion resistance of hot-dipped galvalume coating

Effects of La addition on corrosion resistance of hot-dipped galvalume coating steel wire were investigated. The corrosion resistance of Zn-Al-Si-La alloy coatings containing 0, 0.02wt.%, 0.05wt.%, 0.1wt.% and 0.2wt.% La were evaluated by various tests such as copper-accelerated acetic acid salt spray testing (CASS), immersion test in 3.5% NaCl solution, electrochemical tests including weak polarization curves and electrochemical impedance spectroscopy (EIS) tests, scanning electron microscope (SEM) test and X-ray diffraction (XRD) test. It was found that the corrosion resistance of galvalume coating could be improved by adding proper amounts of La. Meanwhile, the mechanism of the improvement of corrosion resistance by La addition was discussed.     

Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/Tio22 Composite Film

The Ni-P/TiO₂ composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray spectrometer (EDX). The corrosion resistance of Ni-P/TiO₂ film coated on NdFeB magnet, in 0.5 mol/L NaCl solution, was studied by potentiodynamic polarization, salt spray test and electrochemical impedance spectroscopy (EIS) techniques. The self-corrosion current density (i_corr) and the polarization resistance (R_p) of Ni-P/TiO₂ film are 0. 22 μA/cm² (about 14% of that of Ni-P coating), and 120 kΩ • cm² (about 2 times of that of Ni-P coating), respectively. The anti-salt spray time of Ni-P/TiO₂ film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/Ti0₂ film has a better corrosion resistance than Ni-P coating, and the composite film increases the corrosion resistance of NdFeB magnet markedly.     

铝镁及稀土铝镁电弧喷涂涂层的耐腐蚀性能研究

采用电弧喷涂技术在Q235钢表面制备了Al-Mg和Re-Al-Mg涂层,分别研究了这两种涂层的耐腐蚀性能,利用中性盐雾试验及电化学测试等试验方法研究了两种涂层的防腐蚀性能并通过扫描电子显微镜分析了Al-Mg和Re-Al-Mg涂层腐蚀前后的微观组织形貌,并讨论了涂层的结构及耐蚀机理,结果表明两种涂层在极化过程中都出现了明显的钝化现象,两种涂层在腐蚀过程中表面都会生成一层氧化膜,起到了物理屏蔽作用延缓了涂层的腐蚀速率,但稀土铝镁合金涂层的防腐蚀性能明显优于铝镁合金涂层,这是由于稀土元素的加入,降低了涂层的孔隙率,使涂层具有了良好的耐腐蚀性能。稀土铝镁合金涂层在中性盐雾试验中表现出的腐蚀速率是最慢的,电化学试验过程中其表现出钝化区域最大,具有良好的腐蚀与防护性能。     

镀铝板用耐高温型无铬钝化结合机理及性能

传统的有机类无铬钝化产品在400 ℃的高温条件下黄变较重,在保持优异的耐高温前提下,同时具有优异的耐蚀性和加工性能,设计了镀铝板使用的无机类加少量有机类的无铬钝化产品。利用电化学工作站、X射线光电子能谱、X射线荧光谱、红外光谱等方法,对该无铬钝化药剂在热镀铝板表面的成膜机理进行了研究,并结合成膜动力学分析,完成了皮膜与铝硅镀层的界面结合机理分析。对膜重、固化温度对镀铝板工艺性能影响进行研究,得出综合性能优异的膜重控制范围为0.8～1.2 g/m2,对应的PMT温度大于80 ℃。所生产的无铬钝化热镀铝板产品耐高温、耐腐蚀和冲压性能优异,400 ℃烘烤2 h后表面色差ΔE＜3,72 h中性盐雾试验未出现锈蚀。     

Influence of silicon coating on the corrosion resistance of Zn-Al-Mg-RE-Si alloy

The electric arc spraying method was used to prepare the Zn-Al-Mg-RE-Si alloy coating with different content of silicon.The corrosion resisting property was measured by copper accelerated salt spray(CASS) and corrosion weightless test.The influence of silicon content on the corrosion resisting property was investigated by XRD,SEM,polarization curve and electrochemical impedance spectroscopy(EIS) and the electrochemical property of coating in the corrosion process was analyzed.The results showed that the density of coating was improved significantly since the major nonequilibrium glass-like state phase was composed of silicon and other metals existed in the Zn-Al-Mg-RE-Si alloy coating,which prevented the corrosive medium and retarded the corrosion velocity because of compact corrosion products in the corrosion embryo.The Zn-Al-Mg-RE-Si coating had better corrosion resistance than the Zn-Al-Mg-RE because of more positive potential,half corrosion current density and double electrochemical reaction resistance.     

氧化膜对14Cr12Ni2WMoVNb钢QPQ渗层的室温摩擦磨损和腐蚀性能的影响

为了研究14Cr12Ni2WMoVNb钢QPQ(淬火-抛光-淬火)处理后的氧化膜对渗层室温摩擦磨损和腐蚀性能的影响,利用金相、X射线衍射分析、扫描电镜、能谱分析、划痕仪、摩擦磨损试验机和电化学工作站对试样进行了表征.结果表明:氧化膜对渗层室温摩擦学性能的影响与载荷大小有关.在摩擦时间均为4 min情况下,载荷较小(50 N)时,氧化膜可以降低摩擦系数和体积磨损率;载荷较大(100 N)时,氧化膜被破坏无法降低体积磨损率.氧化膜可明显提高渗层的耐腐蚀性能.含氧化膜试样的极化曲线有明显的钝化区,点蚀电位为-13 mV,去除氧化膜试样在盐雾腐蚀12 h后表面有大范围的腐蚀区域,而含氧化膜试样盐雾腐蚀48 h后才有大区域腐蚀发生.      

Influence of silicon coating on the corrosion resistance of Zn-Al-Mg-RE-Si alloy

The electric arc spraying method was used to prepare the Zn-Al-Mg-RE-Si alloy coating with different content of silicon. The corrosion resisting property was measured by copper accelerated salt spray (CASS) and corrosion weightless test. The influence of silicon content on the corrosion resisting property was investigated by XRD, SEM, polarization curve and electrochemical impedance spectroscopy (EIS) and the electrochemical property of coating in the corrosion process was analyzed. The results showed that the density of coating was improved significantly since the major nonequilibrium glass-like state phase was composed of silicon and other metals existed in the Zn-Al-Mg-RE-Si alloy coating, which prevented the corrosive medium and retarded the corrosion velocity because of compact corrosion products in the corrosion embryo. The Zn-Al-Mg-RE-Si coating had better corrosion resistance than the Zn-Al-Mg-RE because of more positive potential, half corrosion current density and double electrochemical reaction resistance.