等离子喷涂工艺对锅炉管束用Fe基非晶涂层组织结构和耐蚀性能的影响

发布时间：2018-07-03 03:06

本文选题：锅炉管束 + 等离子喷涂　；参考：《表面技术》2015年01期

【摘要】：目的研究等离子喷涂功率和喷涂时间对锅炉管束用Fe基非晶涂层的相组成、微观组织结构及涂层耐蚀性能的影响。方法通过X射线衍射、扫描电子显微镜和三电极电化学研究进行分析。结果涂层主要由非晶相组成,表面较为平整致密;随着喷涂功率和喷涂时间的增加,涂层非晶相含量降低,孔隙率降低,致密性升高。非晶涂层在0.5mol/L H2SO4溶液和在3.5%(质量分数)NaCl溶液中均表现出良好的钝化作用,在0.5mol/L H2SO4溶液中钝化区较宽,在3.5%NaCl溶液中自腐蚀电流密度较低。随喷涂功率和时间的增加,阳极极化曲线钝化区加宽,电流密度降低。结论喷涂功率升高会导致涂层孔隙率下降,喷涂时间增加则致使涂层厚度增加,腐蚀介质渗透到基体的表面路径和阻力增加,从而可以进一步改善Fe基非晶涂层的耐蚀性能。
[Abstract]:Objective to study the effects of plasma spraying power and spraying time on the phase composition, microstructure and corrosion resistance of Fe-based amorphous coatings for boiler tube bundles. Methods X-ray diffraction, scanning electron microscope and three-electrode electrochemical analysis were used. Results the coating was mainly composed of amorphous phase and the surface was flat and compact, and with the increase of spraying power and spraying time, the content of amorphous phase decreased, porosity decreased and densification increased. The amorphous coating exhibited good passivation in 0.5 mol / L H _ 2SO _ 4 solution and 3.5% NaCl solution. The passivation zone was wider in 0.5 mol / L H _ 2SO _ 4 solution and the self-corrosion current density was lower in 3.5 mol / L NaCl solution. With the increase of spraying power and time, the passivation zone of anodic polarization curve is widened and the current density decreases. Conclusion the increase of spraying power will lead to the decrease of coating porosity, the increase of spraying time will lead to the increase of coating thickness and the increase of surface path and resistance of corrosion medium permeating to the substrate, which can further improve the corrosion resistance of Fe-based amorphous coatings.
【作者单位】：长安大学材料表面强化研究所;西安特种设备检验检测院;
【基金】：国家质检总局科技计划项目(2013QK111) 长安大学中央高校基金(2014G2310019)~~
【分类号】：TG174.442

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