Process and properties of spray-aluminized coating on cast iron
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摘要: 采用線材火焰噴涂制備鋁基涂層,隨后對涂層進行重熔和擴散處理.利用掃描電鏡、X射線衍射儀、能譜儀、摩擦磨損實驗儀等對涂層的成分、物相、耐高溫氧化性能、耐蝕性能等進行分析測試.結果表明:涂層分為兩層,外層的物相主要是Al、FeAl3、內層是Fe2 Al5和少量的FeAl3;顯微硬度有了很大程度的提高,峰值可達HV 950;滲鋁試樣在800、900℃進行高溫氧化實驗幾乎不增重,抗氧化性能較鑄鐵可提升幾十倍;同時試樣也兼具良好的耐摩擦磨損和耐腐蝕性能.Abstract: Aluminum-based coatings were prepared by flame spraying. After remelting and diffusion treatment, the phase, composition, friction and corrosion resistance were analyzed experimentally by using scanning electron microscopy, X-ray diffraction, energy dispersive spectrometer, wear tester. The results indicate that the surface phase consists of Al and FeAl3, inner layer phase mainly contains FeAl 3 and Fe2 Al5. The coating has higher micro-hardness than the underlying material, with a maximum of up to HV 950. In an experiment of high-temperature oxidation at 800℃ and 900℃, the spray-aluminized samples show almost no weight gain, and the antioxidant properties of cast iron improve substantially (by dozens of times). In addition, the samples show excellent wear and corrosion resistance.
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Key words:
- cast iron /
- flame spraying /
- aluminizing /
- diffusion treatment /
- high-temperature oxidation
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參考文獻
[2] Cheng W J, Wang C J. EBSD characterization of high-temperature phase transformations in an Al-Si coating on Cr-Mo steel. Mater Charact, 2012, 64:15 [3] Chang Y Y, Cheng W J, Wang C J. Growth and surface morphology of hot-dip Al-Si on 9Cr-1Mo steel. Mater Charact, 2009, 60(2):144 [4] Ye H, Yan Z L, Sun Z F. The microstructure and properties of diffusion layer of spray aluminum. J Wuhan Univ Technol Mater Sci, 2005, 20(3):81 [8] ASTM Committee G01 on Corrosion of Metals. ASTM G1-03 Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens. American Society for Testing and Materials, 2011 [9] ASTM Committee G01 on Corrosion of Metals. ASTM G31-72. Standard Practice for Laboratory Immersion Corrosion Test of Metals. American Society for Testing and Materials, 2006 -
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