کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8024330 | 1517546 | 2018 | 47 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High temperature chlorine-induced corrosion of Ni50Cr coating: HVOLF, HVOGF, cold spray and laser cladding
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
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چکیده انگلیسی
To combat the high temperature chlorine-induced corrosion of materials in the biomass and waste fuel-fired thermal power plants NiCr coatings can be used. In this study, a commercially available Ni50Cr gas atomised powder was sprayed onto a power plant alloy using a liquid fuelled and a gas fuelled high velocity oxygen fuel thermal spray (HVOF), cold gas dynamic spray (CS) and laser cladding (LC). High temperature corrosion test was performed at 700â¯Â°C in a controlled environment corrosion test with 500â¯ppm HCl, 5â¯vol% O2 and bal. N2 for 250â¯h. KCl was deposited onto certain samples to understand the mechanism of high temperature chlorine-induced corrosion. The corrosion products were characterised in a SEM with EDX and XRD. A wide range of oxide morphology and distribution was found on the coating top surface which was primarily due to their processing techniques. Cross-section examination of the coatings showed various degrees of internal attack and scale growth. In the absence of any deposit on the surface, cold-sprayed coating showed the poorest performance since the corrosive ion penetrated ~600â¯Î¼m after 250â¯h exposure, which is due to the inter-connected porosity. In presence of KCl deposit, laser cladded coating showed the best corrosion performance because the grooving pattern (traces of corrosive ion penetration) only penetrated 80â¯Î¼m, which is predominantly due to its pore free microstructure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 337, 15 March 2018, Pages 357-369
Journal: Surface and Coatings Technology - Volume 337, 15 March 2018, Pages 357-369
نویسندگان
B. Song, K.T. Voisey, T. Hussain,