(華僑大學 材料科學與工程學院，廈門 361021)
摘 要: 在以檸檬酸三鈉為絡合劑的酸性鍍液中電沉積Fe-P非晶合金，采用差示掃描量熱(DSC)、X射線衍射(XRD)和掃描電鏡(SEM)研究該合金鍍層的晶化行為和表面微觀形貌。結果表明：鍍液中加入絡合劑，且隨著pH值升高和溫度降低時，F(xiàn)e-P非晶合金共沉積的陰極極化增大。鍍態(tài)Fe-P合金為非晶態(tài)結構，于330.5 ℃時開始晶化； 383.6 ℃時，α-Fe(P)固溶體大量晶化析出；472.5 ℃時，F(xiàn)e3P(I-4)相大量脫溶析出。且隨著熱處理溫度升高，合金鍍層的耐蝕性能和硬度先增加后下降，450 ℃熱處理所得鍍層的耐蝕性能最佳且硬度最大；在400 ℃以下時，鍍膜具有良好的抗熱氧化能力，當溫度在400 ℃以上時，抗氧化能力迅速下降。
關鍵字: Fe-P非晶合金鍍層；電沉積行為；熱處理
（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
