金属表面等离子喷涂玄武岩涂层的腐蚀性能研究

采用玄武岩废料经烧结水淬和未烧结两种不同方法制备喷涂材料,并利用等离子喷涂技术,在45#钢基体表面制备了涂层.利用XRD观察了涂层的组成,采用扫描电镜(SEM)观察涂层的结构特征,采用全浸泡腐蚀实验、电化学测试方法评价了涂层的耐蚀性能.结果表明,涂层以非晶态为主,生成少量晶体,烧结涂层的玻璃化程度增加.玄武岩涂层可以提高金属的耐腐蚀性能,耐碱腐蚀性优于耐酸腐蚀性,采用烧结粉体制备的涂层,涂层组织结构和性能都有了一定的改善,涂层致密度提高,涂层耐蚀性大大提高.     

等离子喷涂ZrO2对钛/羟基磷灰石力学性能的影响

研究了有ZrO2涂层与无ZrO2涂层的钛／羟基磷灰石复合材料的力学性能。研究表明无ZrO2涂层的钛／羟基磷灰石复合材料的力学性能明显受烧成时间的影响。通过SEM观察，没有发现在ZrO2涂层和钛基体材料之间有氧化物的生成。结果表明，ZrO2涂层在750℃温度下能够延缓钛基体材料的氧化。而且加强了和钛基之间的接合强度。     

电弧喷涂工艺参数对铝涂层孔隙率的影响

研究了电弧喷涂工艺参数对铝涂层孔隙率的影响,结果表明：在其它工艺参数不变的情况下,随着空气雾化压力的增加,铝涂层的孔隙率呈下降趋势;喷距在150～200 mm变化时,对孔隙率的影响不太明显,但喷距大于200 mm时,涂层的孔隙率明显增大;随着工作电压和工作电流的增加,涂层的孔隙率都是先减小后增大,并且工作电压在35～36 V之间,工作电流在170 A左右时,涂层的孔隙率达到最低。     

甲板涂料涂层对铝合金腐蚀性能影响

通过电化学实验方法研究甲板涂料涂层对5083铝合金腐蚀性能影响。分别测试5083铝合金裸板试样(A)、两种完整甲板涂料涂层试样(w)及其对应的人工破损甲板涂料涂层试样(x)的开路电位和交流阻抗谱。通过开路电位的测试,比较不同甲板涂料涂层体系对基材5083铝合金开路电位的影响及随时间的变化;通过交流阻抗谱的测试,比较不同甲板涂料涂层体系的涂层孔隙电阻和涂层电容随时间的变化情况。     

等离子喷涂陶瓷涂层的现状与应用

本文综述了陶瓷涂层的等离子喷涂制备方法、工艺特点以及陶瓷涂层在各领域中的应用,介绍了目前常用的等离子喷涂陶瓷材料,并对等离子喷涂陶瓷涂层的发展趋势进行了展望.     

等离子喷涂陶瓷涂层的界面研究

介绍了等离子喷涂陶瓷涂层的界面特征,综述了等离子喷涂涂层的界面物理化学特性,在此基础上总结提出涂层界面设计与控制的几个先进途径,并探讨了等离子喷涂陶瓷涂层的界面研究的重点与难点问题.     

应力作用下铁基非晶涂层腐蚀性能影响的研究综述

从铁基非晶合金和涂层的研究入手,概述了制备过程中残余应力和外加应力对涂层腐蚀性能的影响,以期为开展非晶涂层在力学和腐蚀环境中的研究提供理论指导,扩大非晶涂层的应用领域。     

反应等离子喷涂TiN-Al3Ti-Al复相陶瓷涂层的研究

采用反应等离子喷涂法制备了TiN-Al3Ti-Al复相陶瓷涂层,并通过XRD、SEM对复相涂层进行了相分析、表面行貌分析。结果表明涂层主要由TiN、Al3Ti、Al等三相组成;涂层的结构为富硬质相和富软质相堆叠在一起的层状组织;显微压痕和断口表明复合涂层的韧性较Al2O3涂层有着明显提高。     

等离子喷涂氧化锆涂层的显微结构分析

利用透射电镜(TEM)、扫描电镜(SEM)和X射线衍射仪(XRD)等分析技术,表征了等离子喷涂氧化锆涂层的显微结构.结果表明:等离子喷涂氧化锆涂层是由典型的柱状晶粒组成的层状结构;柱状晶粒晶型发育完整,晶粒之间具有清楚晶界;涂层表面存在明显的完全熔融区和未熔融区;涂层中分布有一定的大气孔.涂层的主晶相是四方氧化锆,没有单斜氧化锆相存在;涂层中裂纹的扩展是穿晶断裂和沿晶断裂共存.     

Exploring the influences of the counterpart materials on friction and wear behaviors of atmospheric plasma-sprayed YSZ coating

Sliding wear behaviors of atmospheric plasma-sprayed Yttria Stabilized Zirconia (YSZ) coating mated with four metallic or ceramic counterparts (Si₃N₄, Al₂O₃, GCr15 and ZrO₂) were investigated. It has been found that YSZ coatings in contact with Si₃N₄ and GCr15 show better tribological performances than the other cases, which is due to the formation of the tribolayer mainly consisting of Si₃N₄ and Fe₂O₃ respectively on the worn surfaces. In the case of YSZ coating-Al₂O₃ and YSZ coating-ZrO₂ tribopairs, the wear debris are more irregular and larger in size, resulting in severe abrasive wear and brittle fracture of debris particles. In particular, the specific wear rate of YSZ coating sliding against GCr15 is negative due to the significant material transfer of the tribo-oxide layer, while that of YSZ coating sliding against ZrO₂ is the highest. Amorphization of the wear particles appears in the four cases due to the repeated mechanical action. It has been demonstrated that the wear of YSZ coating deteriorates with the increased flash temperature between the contact surfaces during rubbing process.     

管道等离子喷涂Cr_2O_3复合涂层及其耐蚀性能

采用等离子喷涂技术在X70管线钢表面喷涂Cr_2O_3复合涂层,利用X射线衍射仪、扫描电镜、维氏硬度计、划痕仪、电化学工作站等方法表征了涂层相关特征与性能。结果表明,相成分主要是Cr_2O_3和TiO_2,硬度可达4.928GPa,结合力可达46.15N,粘结层+陶瓷层试样腐蚀速率显著降低,对基体有很好的耐蚀保护作用。     

Preparation and characterization of YSZ abradable sealing coating through mixed solution precursor plasma spraying

Yttria-stabilized zirconia (YSZ) ceramic matrix abradable sealing coatings were prepared by plasma spraying of a blend of YSZ solution precursor with YSZ nano-particles. The microstructure and phase compositions of the prepared abradable sealing coatings were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). In addition, the mechanical, high-temperature oxidation, and tribological properties of the coatings were systematically investigated. The results show that addition of YSZ nano-particles increased porosity and bond strength and decreased the hardness of the coating. The optimum performance value was achieved by addition of 5?g nano-particles into the coating. The coatings maintained excellent thermal stability through a ten-cycle thermal shock test at 1150?°C. The 8YSZ-5 coating had an improved oxidation constant of 5.540?×?10^?4 and exhibited remarkable oxidation kinetics at 1150?°C. The friction coefficient of the mixed solution precursor coating was remarkably decreased compared with a traditional ceramic matrix abradable sealing coating. The results indicate that mixed solution precursor plasma spraying increased abradable sealing coating application performance.     

机械力表面改性对镁合金含铝涂层耐腐蚀性能影响的研究

在AZ91D镁合金表面涂覆含有铝粉的缩丁醛有机涂层，并对涂层表面进行机械力表面改性通过中性盐雾试验和W=5％的NaCl溶液浸泡试验研究了机械力表面改性和不同铝粉粒径对该涂层耐腐蚀性能的影响时涂层经机械力表面改性前后的微观形貌和NaCI溶液中的交流阻抗分踟进行了探讨结果表明，涂液中铝粉的粒径对涂层的耐蚀性有较大影响；该机械力表面改性处理可以增强有机涂层与基体的结合强度，提高涂层表面的致密程度．从而提高了涂层的耐腐蚀性能。     

Thermal cycling and hot corrosion behavior of a novel LaPO4/YSZ double-ceramic-layer thermal barrier coating

LaPO₄ powders were produced by a chemical co-precipitation and calcination method. The ceramic exhibited a monazite structure, kept phase stability at 1400?°C for 100?h, and had low thermal conductivity (~ 1.41?W/m?K, 1000?°C). LaPO₄/Y₂O₃ partially stabilized ZrO₂ (LaPO₄/YSZ) double-ceramic-layer (DCL) thermal barrier coatings (TBCs) were fabricated by air plasma spray. The LaPO₄ coating contained many nanozones. Thermal cycling tests indicated that the spallation of LaPO₄/YSZ DCL TBCs initially occurred in the LaPO₄ coating. The failure mode was similar to those of many newly developed TBCs, probably due to the low toughness of the ceramics. LaPO₄/YSZ DCL TBCs were highly resistant to V₂O₅ corrosion. Exposed to V₂O₅ at 700–900?°C for 4?h, La(P,V)O₄ formed as the corrosion product, which had little detrimental effect on the coating microstructure. At 1000?°C for 4?h, a minor amount of LaVO₄ was generated.     

环氧有机涂层对锌铁合金镀层耐蚀性的影响

利用腐蚀浸泡实验、失重法和交流阻抗谱分析等方法研究了环氧有机涂层对Q235钢电镀锌铁合金镀层耐蚀性的影响。结果表明,Q235钢基体、Q235+Zn–Fe合金镀层试样和Q235+Zn–Fe合金镀层+环氧有机涂层试样在5%NaCl溶液中浸泡504 h后,腐蚀速率分别为0.068 0、0.040 0和0.018 0 mm/a。涂覆环氧有机涂层至少能使锌铁合金镀层的防腐性能提高2倍,从而延长基体材料的使用寿命。     

锌粉和有机硅对聚氨酯涂层耐蚀性和热性能的影响

通过浸泡腐蚀和高温烘烤,以涂层的冲击强度为依据,研究了不同锌粉含量的聚氨酯涂层在10%(质量分数,下同)HCl、10%NaOH和20%NaCl溶液中的耐腐蚀性以及不同有机硅添加量的涂层在120℃下的耐热性.通过热重分析(TG-DSC),比较了改性前后聚氨酯涂料的热稳定性,测试了涂层的综合性能.结果表明,含锌量为83%的...     

医用镍钛合金表面微弧氧化膜层的显微结构及耐蚀性

采用由NaAlO2和NaH2PO2组成的电解液,以微弧氧化技术在医用镍钛合金表面制备Al2O3陶瓷膜层,以减少合金表面Ni含量,并进一步提高其耐腐蚀性能,使其具有良好的生物相容性.随微弧氧化过程中处理时间的延长,试样表面的游动火花由白色逐渐向橙色转变,火花数减少但尺寸增大.所得陶瓷膜层由γ-Al2O3晶相组成,随着处理...     

Thermal shock behavior of a 8YSZ/CoCrAlYTaSi thermal sprayed barrier coating on GH202 superalloy

The thermal shock behavior of a thermal barrier coating (TBC) prepared by plasma spraying at 1100 °C was investigated. The TBC consisted of a double layer structure of 8YSZ/CoCrAlYTaSi. The morphology, microstructure, phases and the elemental distribution of the TBCs were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), scanning transmission electron microscope (STEM), X-ray diffraction (XRD) and electron probe micro-analysis (EPMA). The characterization results showed that the film consisted primarily of metastable tetragonal phases (t′), and a large number of micro-cracks were present in the 8YSZ crystals. Following eighty-six thermal shock cycles of the specimens a large areal spallation was observed on the 8YSZ coating. The decreased concentration of yttrium at the coating interfaces weakened the inhibition of crystal growth and the phase transition of the Al₂O₃. The growth of TGO (Thermal growth oxide) and the diffusion into the 8YSZ coating produced deformation and stress in the ceramic coating. Tantalum appeared to absorb the oxygen that diffused into the coatings and delayed the growth of TGO in the interface between the CoCrAlYTaSi and substrate, which was beneficial to prolonging the life of the TBC.     

氧化石墨烯/羟基磷灰石涂层对镁合金耐腐蚀性的影响

采用仿生法在改性模拟体液中于镁合金表面制备了羟基磷灰石(HA)涂层和氧化石墨烯/羟基磷灰石(GO/HA)复合涂层。利用扫描电子显微镜(SEM)和X射线衍射(XRD)对两种涂层进行了形貌和结构表征,通过析氢量测量、极化曲线和交流阻抗等方法分别研究了裸镁合金、含HA涂层及GO/HA涂层镁合金在pH为7.4的模拟体液(SBF)和3.5%NaCl溶液中的腐蚀行为。结果表明,氧化石墨烯增加了羟基磷灰石涂层的致密性,含GO/HA复合涂层的AZ91镁合金耐腐蚀性能最好,相对于裸镁合金,其腐蚀电流密度降低了一个数量级,析氢量降低了52%。