目的：对比研究超音速等离子喷涂( HVAP )技术与超音速火焰喷涂( HVOF )技术制备WC10 Co4 Cr涂层,并根据涂层组织形貌与电化学特性判断两种工艺的优劣。方法采用SEM及XRD分析WC10 Co4 Cr复合涂层的微观形貌和物相,在3.5%(质量分数) NaCl溶液中对涂层进行电化学分析。结果 WC10Co4Cr涂层由较大的WC颗粒及粘结相组成,在喷涂过程中WC颗粒不断累积形成层片状结构,涂层有较小程度的失碳,形成了具有脆性的W2 C。电化学极化测试表明,超音速等离子喷涂技术制备的涂层表现出优异的抗电化学腐蚀性能。结论超音速等离子喷涂技术制备的WC10 Co4 Cr涂层显微硬度为1197HV,孔隙率为0.50%,腐蚀电位为-0.3947 V,腐蚀电流密度为9.19×10-7 A/cm2,腐蚀速率为1.01×10-2 g/(m2·h),腐蚀深度为1.09×10-2 mm/a,具有与超音速火焰喷涂涂层相似的耐腐蚀性能。
ABSTRACT:Objective WC10Co4Cr coatings prepared by high velocity air plasma (HVAP) and high velocity oxy-fuel spraying ( HVOF) were comparatively studied, and the advantages and disadvantages of the two technologies were judged by the morphology and electrochemical property of the coatings prepared. Methods The microstructure and phase constitution of the WC10Co4Cr com-posite coatings were analyzed by SEM and XRD, and the electrochemical analysis of the coatings was performed in 3. 5% ( mass fraction) NaCl solution. Results The morphology results showed that the coatings were composed of relatively large WC ceramic particles and metallic binders, and lamellar structures were formed during the coating process by the steady accumulation of WC particles. The coatings showed a small degree of carbon loss, and formed W2 C with brittleness. The potentiodynamic polarization test revealed that the WC10Co4Cr coating prepared by HVAP showed excellent electrochemical corrosion resistance. Conclusion The WC10Co4Cr coating prepared by HVAP had a microhardness of 1197HV, a porosity of 0. 50%, a corrosion potential of-0. 3947 V, a corrosion current density of 9. 19í10-7 A/cm2, a corrosion rate of 1. 01í10-2 g/(m2·h), and a corrosion depth of 1. 09í10-2 mm/a, and showed a similar corrosion resistance with the coating prepared by HVOF.
参考文献
| [1] | KAWASAKIA;WATANABER;YUKIM .Effect of Micro-structure on Thermal Shock Craking of Functionally Graded Thermal Barrier Studied by Burner Heating Test Materials Transactions[J].Functionally Graded Materials,1996,37(04):788-795. |
| [2] | 张燕,张行,刘朝辉,邓智平.热喷涂技术与热喷涂材料的发展现状[J].装备环境工程,2013(03):59-62. |
| [3] | 王引真;孙永兴;何艳玲 .涂层材料对等离子陶瓷涂层抗热震性的影响[J].机械工程材料,1999,23(04):28-31. |
| [4] | 廖恒成;张春燕;孙国雄 .等离子喷涂与先进材料研制[J].材料研究学报,1999,13(02):119-124. |
| [5] | WANGZhi-ping .Residual Stress Evaluation of Thermal Spra-yed Coatings by a Modified Method[J].China Welding,1998,7(02):130-138. |
| [6] | 杨洪伟,栾伟玲,涂善东.等离子喷涂技术的新进展[J].表面技术,2005(06):7-10. |
| [7] | 刘世念;苏伟;魏增福 等.热喷涂防腐涂层在大气环境中的应用[J].装备环境工程,2013,10(06):72-75. |
| [8] | 欧献,邓畅光,王日初,毛杰.超音速等离子喷涂工艺参数对Cr2O3涂层硬度的影响[J].表面技术,2014(01):81-85,102. |
| [9] | 徐滨士,王海军,朱胜,梁秀兵.高效能超音速等离子喷涂技术的研究与开发应用[J].制造技术与机床,2003(02):30-33. |
| [10] | 陈方明,管俊芳,李勇.陶瓷/金属等离子涂层显微组织特征及其图像分析[J].材料科学与工程学报,2003(06):809-812. |
| [11] | Qiao YF.;Fischer TE.;Dent A. .The effects of fuel chemistry and feedstock powder structure on the mechanical and tribological properties of HVOF thermal-sprayed WC-Co coatings with very fine structures[J].Surface & Coatings Technology,2003(1):24-41. |
| [12] | 韩志兵,朱世根,齐小犇,许新军,丁浩.纳米和微米WC/12Co涂层的电接触强化研究[J].表面技术,2013(04):17-20. |
| [13] | 赵辉,王群,丁彰雄,张云乾.HVOF喷涂纳米结构WC-12Co涂层的组织结构分析[J].表面技术,2007(04):1-3,14. |
| [14] | MONTICELLI C;FRIGNANI A;ZUCCHI F.Investigation on the Corrosion Process of Carbon Steel Coated by HVAF WC/Co Cermets in Neutral Solution[J].Corrosion Science,2004(46):1225-1237. |
| [15] | 王丽君,邱培现,刘艳,周伍喜,苟国庆,陈辉.含有金属黏结相的热喷涂WC涂层在盐雾中的腐蚀行为[J].中国有色金属学报（英文版）,2013(09):2611-2617. |
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