(华侨大学 材料科学与工程学院，厦门 361021)
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。
关键字: Fe-P非晶合金镀层；电沉积行为；热处理
（College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China）
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 ℃.
Key words: Fe-P amorphous alloy coating; electro-deposition behavior; heat treatment
