电弧热喷涂NiCr20合金涂层:制造,密封,热处理,耐磨和耐腐蚀性

IF 2.3 Q3 ELECTROCHEMISTRY International journal of electrochemistry Pub Date : 2019-01-27 DOI:10.1155/2019/8796958
V. Nguyễn, Q. L. Thu, T. Nguyen, Quoc Cuong Ly, Ly Pham Thi, Ha Pham Thi, Thanh Dinh Thi Mai
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引用次数: 3

摘要

研究了热处理对磷酸铝封孔后热喷涂NiCr20涂层的孔隙率、相组成、显微硬度以及耐磨腐蚀性能的影响。退火温度在400至1000°C的范围内变化。结果表明,涂层孔隙率随退火温度的升高而降低。在800-1000°C的温度范围内处理后,涂层中90%以上的初始孔隙被密封剂成功填充。XRD数据不仅揭示了其他化合物新相的形成,还揭示了涂层和密封剂之间的相互作用。热处理后涂层的耐磨性是未热处理的12倍。在H2SO4溶液中的腐蚀试验表明,涂层中密封剂的存在提高了涂层的耐腐蚀性。从这些发现来看,应用这些NiCr20涂层来保护钢免受磨损和腐蚀似乎非常有前景。
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Arc Thermal Spray NiCr20 Alloy Coating: Fabrication, Sealant, Heat Treatment, Wear, and Corrosion Resistances
This study presents the effect of heat treatment on porosity, phase composition, microhardness, and wear and corrosion resistances of the thermal sprayed NiCr20 coating after sealing with aluminum phosphate. The annealing temperatures were varied in a range of 400 to 1000°C. The obtained results indicated the porosity of coating decreased with increasing the annealing temperature. After treatment at temperatures in range of 800-1000°C, more than 90% of initial pores in the coating were successfully filled with the sealants. The XRD data revealed not only the formation of new phases of other compounds, but also the interaction between coating and sealant. After heat treatment, wear resistance of coating was 12 times higher than that without heat treatment. The corrosion test in H2SO4 solution indicated that the presence of sealant in coatings increased their corrosion resistance. From these findings, application of these NiCr20 coatings to protect steel against wear and corrosion appears very promising.
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