目的：研究纳米NiCrBSi-TiB2涂层在800℃下的Na2 SO4-30%(质量分数) K2 SO4熔盐中的热腐蚀行为。方法采用超音速火焰技术在中碳钢表面喷涂纳米 NiCrBSi-TiB2涂层,以饱和 Na2 SO4-30%K2 SO4溶液为腐蚀介质,研究该涂层在800℃时的热腐蚀行为。结果微米涂层晶粒粗大,Si的扩散系数低,易出现贫Si富Cr层,形成的Cr2 O3膜在碱性熔盐中具有较低的溶解度,对涂层具有良好的保护作用。结论微米涂层在Na2 SO4-30%K2 SO4熔盐中具有更优的抗热腐蚀性能。
ABSTRACT:Objective To study the hot corrosion behavior of the NiCrBSi-TiB2 coating in molten Na2 SO4-30% K2 SO4 salt at 800 ℃. Methods The nanostructured NiCrBSi-TiB2 coating was sprayed on the surface of carbon steel by high velocity oxy-fuel ( HVOF) , and its hot corrosion behavior at 800 ℃ was investigated using saturated Na2 SO4-30% K2 SO4 solution as the corrosion medium. Results The micron coating had coarse grains, and the diffusion coefficient of Si was low, which easily led to the forma-
tion of Si-depleted Cr-rich layer, and the Cr2 O3 film formed had relatively low solubility in basic molten salt, which could well pro-tect the coating. Conclusion The micron coating had higher resistance against hot corrosion in molten Na2 SO4-30%K2 SO4 salt.
参考文献
| [1] | 田浩亮,魏世丞,陈永雄,刘毅,童辉,徐滨士.高速电弧喷涂在工程机械零部件再制造领域中的应用现状[J].表面技术,2013(03):99-102. |
| [2] | PETTIT F S .Oxidation and Hot Corrosion of Super Alloys[J].Super Alloys,1984,6(2):651-687. |
| [3] | LEE S H .High Temperature Corrosion in Waste-to-energy Boilers[J].Journal of Thermal Spray Technology,2007,16(1):104-110. |
| [4] | LIU G;ROZNIATOWSKI K;KURZYDLOWSKI K J .Quan-titative Characteristic of FeCrAl Films Deposited by Arc and High-velocity Arc Spraying[J].Materials Characterization,2001,46(2/3):99-104. |
| [5] | ZANCHUK W.The Use of Tafaloy 45CT,an Ni-Cr-Ti alloy, As an Arc Sprayed Corrosion Barrier in High Temperature Sulfurous Environments[J].Surface and Coatings Technolo-gy,1989(39/40):65-69. |
| [6] | 王泽旺,张寰,赵程.氩弧熔覆 TiC 颗粒增强 Fe 基涂层组织性能研究[J].表面技术,2014(05):51-54,75. |
| [7] | Deyuan Lou;Chunlin He;Shuo Shang;Changsheng Liu;Qingkui Cai .Microstructure and performances of graphite scattered Cr_3C_2-NiCr composites prepared by laser processing[J].Materials Letters,2013(Feb.15):304-307. |
| [8] | WU Y .Cycle Oxidation Behavior of Nanostructured Ni60-TiB2 Composite Coating Sprayed by HVOF Technology[J].Applied Surface Science,2011,257:10224-10232. |
| [9] | DURSUN O .An Investigation into the Wear Behaviour of TiB2 Particle Reinforced Aluminum Composites Produced by Mechanical Alloying[J].SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS,2011,18(1/2):5-12. |
| [10] | WU Y .Microstructure and Sliding Wear Behavior of Nano-structured Ni60-TiB2 Composite Coating Sprayed by HVOF Technology[J].Surface and Coatings Technology,2011,206:1102-1108. |
| [11] | 孟君晟,吉泽升.氩弧熔敷原位合成TiC-TiB2/Ti基复合涂层组织及性能分析[J].焊接学报,2013(09):67-70. |
| [12] | 吴姚莎;曾德长;邱万奇 等.高能球磨制备纳米 Ni60-TiB2 金属基陶瓷结构喂料及其结构特性[J].稀有金属材料与工程,2011,40(2):507-511. |
| [13] | RAPP R A .Hot Corrosion of Materials[J].Pure and Ap-plied Chemistry,1990,62(1):113-122. |
| [14] | JACOBSON N S .Sodium Sulfate:Deposition and Dissolution of Silica[J].Oxidation of Metals,1989,31(1/2):91-103. |
| [15] | 龙世宗,陈永忠,程彬,舒玮,熊荣军.KCl-K2SO4-Na2SO4系统低温融体形成的温度范围[J].硅酸盐学报,2006(04):504-506. |
| [16] | MA S .Study of Hot Corrosion Resistance Mechanisms of Arc Spraying Coatings[J].ACTA METALLURGICA SINICA,1999,12(5):1007-1013. |
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