Nghiên cứu khả năng chống ăn mòn mài mòn của lớp phủ hợp kim NiCr20 được thẩm thấu với photphat nhôm trong môi trường axit

Nguyễn Văn Tuấn, Phạm Thị Hà, Phạm Thị Lý, Võ An Quân, Đinh Thị Mai Thanh, Lê Thu Quý, Phạm Đức Roãn


The corrosive wear resistance of NiCr20 alloy coating (NC) impregnated by aluminum phosphate and heat-treated at 600 oC (NA6) and 1000 oC (NA10) was investigated in acid H2SO4 pH = 2 containing SiO2 3 % by weight; the flow velocity is 4 m/s. The analysis of X-ray diffraction (XRD) showed that, the stable crystalline phases in acidic media such as AlPO4 and Al(PO3)3 which were formed on NA6 coating’s surface made corrosive wear resistance of NA6 coating increase in comparison with the resistance measured on NA10 and NC coating samples. The formation of unstable crystalline phases such as Al36P36O144 and Ni3(PO4)in NA10 coating caused the corrosive wear resistance of NA10 coating smaller than that one measured on NC coating. After 168 hours of corrosive wear test, the thickness of NA6 coating reduced to about 47 μm, while it was about 67 μm for NC coating.

Keywords. Thermal spray, aluminum phosphate sealant, acidic corrosion, corrosion wear.

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E. M. Leivo, M. S. Vippola, P. P. A. Sorsa, P. M. Vuoristo and T. A. Mantyla. Wear and corrosion properties of plasma sprayed Al2O3 and Cr2O3 coatings sealed by aluminum phosphates, Journal of Thermal Spray Technology, 6(2), 205 (1997).

M. Vippola, S. Ahmaniemi, J. Keranen, P. Vuoristo, T. Lepisto, T. Mantyla, Eva Olsson. Aluminum phosphate sealed alumina coating: characterization of microstructure, Materials Science and Engineering A, 323, 1-8 (2002).

S. Ahmaniemi, M. Vippola. Residual stresses in aluminium phosphate sealed plasma sprayed oxide coatings and their effect on abrasive wear, Wear, 252, 614-623 (2002).

M. Vippola, J. Vuorinen, P. Vuoristo, T. Lepisto, T. Mantyla. Thermal analysis of plasma sprayed oxide coatings sealed with aluminium phosphate. Journal of the European Ceramic Society, 22, 1937-1946 (2002).

S. Ahmaniemi, P. Vuoristo, and T. Mantyla. Improved Sealing Treatments for Thick Thermal Barrier Coatings, Surface & Coatings Technology, 151-152, 412-417 (2002).

S. A. Abd El Gwad, M. S. Morsi, K. F. Ahmed. Characterization of Air Plasma Sprayed AlPO4 and Laser-Sealed ZrO2-MgO Coatings on Ni-Base Supper Alloys of Aero-Engine, Int. J. Electrochem. Sci., 13020-13043 (2012).

Y. Wang, S. L. Jiang, Y. G. Zheng, W. Ke, W. H. Sun, J. Q. Wang. Effect of porosity sealing treatments on the corrosion resistance of high-velocity oxy-fuel (HVOF)-sprayed Fe-based amorphous metallic coatings, Surface & Coatings Technology, 206, 1307-1318 (2011).

Nguyễn Văn Tuấn, Lê Thu Quý, Nguyễn Thu Hoài. Nghiên cứu chế tạo chất bịt phốt phát nhôm, Tạp chí Hóa học, 49(2ABC), 796-800 (2011).

F. L. Vadim. Impedance Spectroscopy: Applications to Electrochemical and Dielectric Phenomena, Wiley (2012).

Nguyễn Văn Tuấn, Lê Thu Quý, Phạm Thị Hà, Phạm Thị Lý, Đỗ Thị Thục, Đào Bích Thủy, Lý Quốc Cường. Ảnh hưởng của chất bịt phốt phát nhôm tới khả năng bảo vệ chống ăn mòn của lớp phun phủ hợp kim NiCr trong môi trường axit sulfuric, Tạp chí Hóa học, 52(6A), 132-136 (2014).

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