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

Nơi đăng: Tạp chí hóa học, 55(1): 43-47, 2017. DOI: 10.15625/0866-7144.2017-00414.

Thời gian đăng: 2017

Tóm tắt: 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 pH2 containing SiO₂ 3% of  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)^2¬ 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.

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