Microstructure and electrochemical properties of molybdenum base amorphous and nanocrystalline alloy coatings by plasma spraying
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摘要: 用Mo基合金粉末(含Si,B,Cr,W,Mo,Ni等)作為噴涂材料,利用大氣等離子噴涂(APS)技術,在0Cr13Ni5Mo不銹鋼基體上制備了鉬基非晶納米晶復合涂層.利用XRD觀察了涂層的晶型結構,掃描電鏡(SEM)觀察涂層的組織形貌,恒電位掃描儀對涂層的電化學特性進行了測試,顯微硬度儀測量涂層的顯微硬度.實驗結果表明,利用等離子噴涂工藝可以制備高硬度的Mo基非晶納米晶復合涂層,這種涂層結構均勻致密,其顯微硬度最高達到1426.9HV.孔隙率約為5.5%.非晶納米晶復合涂層在3.5%NaCl溶液中存在鈍化現象,自腐蝕電流為6.459μA·cm-2,腐蝕速度0.869mm·a-1.Abstract: A coating was prepared on 0Cr13Ni5Mo stainless steel by air plasma spraying with a kind of molybdenum base alloy powder which contains Si, B, Cr, W, Mo, Ni etc. as the plasma spraying powder. It was proved that the Mo-base alloy coating fabricated by air plasma spraying has homogenous microstructure and contains metal glass and nanocrystals by X-ray diffractometer, SEM, TEM and Potentionstat/Galvanostat Model 273. The coating has high hardness and the highest micro-hardness can reach 1 426.9 HV. The porosity is about to 3.1%. Experimental results also show that Mo-base amorphous and nanocrystalline alloy coatings can appear a passivation phenomenon in a 3.5% NaCl solution with Icorr(R)=6.459μA·cm-2 and E (I=0)=0.869 mm·a-1.
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