Authors:Nguyen Van Tuan, Pham Thi Ha, Pham Thi Ly, Vo An Quan, Dinh Thi Mai Thanh, Le Thu Quy, Pham Duc Roan

Publisher: Journal of Chemistry, 55(1): 43-47, 2017. DOI: 10.15625/0866-7144.2017-00414.

Publication date: 2017

Abstract:The corrosive wear resistance of NiCr20 alloy coating (NC) impregnated by aluminum phosphate and heat-treated at 600°C (NA6) and 1000°C (NA10) was investigated in acid H₂SO₄ pH2 containing SiO₂ 3% of  weight; 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 causes the corrosive wear resistance of NA10 coating  smaller than that one measured on NC  coating. After 168 hours of corrosive wear testing, the thickness of the NA6 coating was reduced to about 47 μm, while it was about 67 μm for the NC coating. [Full text of the article: See details at here

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