Fe-P非晶合金的电沉积行为及热处理对其结构与性能的影响

来源期刊:中国有色金属学报2012年第2期

论文作者:王森林 宋运建

文章页码:496 - 503

关键词:Fe-P非晶合金镀层;电沉积行为;热处理

Key words:Fe-P amorphous alloy coating; electro-deposition behavior; heat treatment

摘    要:在以柠檬酸三钠为络合剂的酸性镀液中电沉积Fe-P非晶合金,采用差示扫描量热(DSC)、X射线衍射(XRD)和扫描电镜(SEM)研究该合金镀层的晶化行为和表面微观形貌。结果表明:镀液中加入络合剂,且随着pH值升高和温度降低时,Fe-P非晶合金共沉积的阴极极化增大。镀态Fe-P合金为非晶态结构,于330.5 ℃时开始晶化; 383.6 ℃时,α-Fe(P)固溶体大量晶化析出;472.5 ℃时,Fe3P(I-4)相大量脱溶析出。且随着热处理温度升高,合金镀层的耐蚀性能和硬度先增加后下降,450 ℃热处理所得镀层的耐蚀性能最佳且硬度最大;在400 ℃以下时,镀膜具有良好的抗热氧化能力,当温度在400 ℃以上时,抗氧化能力迅速下降。

Abstract:

The Fe-P amorphous alloy was electro-deposited from an acidic bath containing sodium citrate as a complexant. The crystallization behavior and surface micro-morphology of the alloy coating were investigated by differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that the cathodic polarization of Fe-P amorphous alloy co-deposition increases with the increases of the complexant concentration, the bath pH value and the decrease of temperature, respectively. The structure of the as-plated Fe-P alloy coating is amorphous. The amorphous alloy begins to crystallize at 330.5 ℃, and α-Fe(P) solid solution appears at 383.6 ℃, then, lots of Fe3P(I-4) phase separate out from solid solution at 472.5 ℃. The corrosion resistance and micro-hardness of the alloy coating increase, then decrease, and the best properties appear at 450 ℃. The heat oxidation experiments show that the oxidation resistance of the coating is good bellow 400 ℃ and drops rapidly above 400 ℃.

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