铝合金化学镀Ni-Fe-P-B工艺研究

A Study of Electroless Ni-Fe-P-B Plating on Aluminium Alloy

研究了以铝合金为基体 ,化学镀Ni Fe P B合金工艺及镀速、镀层组成和耐蚀性。通过控制NaH2 PO2 、KBH4、丁二酸的浓度 ,金属盐的比率 (NH4) 2 Fe(SO4) 2 / [(NH4) 2 Fe(SO4) 2 +NiSO4]及 pH值得到理想的镀层。在NaH2 PO2 30 g/L、KBH41.0g/L、金属盐的比率 0 .4、丁二酸 8g/L ,pH值 9.0～ 10时 ,镀速最高 ,镀层主要为非晶态结构 ,且与基体结合力优良 ;耐蚀性良好 ,在 10 %NaOH溶液中的耐蚀性能优于在 1mol/LHCl和 3.5 %NaCl溶液中的耐蚀性能 ;该镀层合金中铁、磷和硼的质量分数分别为 2 7.14 %、2 .5 7%和 6 .0 7%。

The process, deposition rate, composition and corrosion resistance of electroless Ni Fe P B deposit on aluminum alloy is studied. An ideal deposit can be obtained by controlling the concentration of NaH 2PO 2, KBH 4,C 4H 6O 4,metallic salt ratio (NH 4) 2 Fe(SO 4) 2 / [(NH 4) 2Fe(SO 4) 2+NiSO 4] and pH value. The deposition rate is the highest when the concentration of NaH 2PO 2 is at 30 g/L, KBH 4 1.0 g/L,C 4H 6O 4 8 g/L,metallic salt ratio 0.4, and pH 9.0 10. The resulted deposit is mainly of amorphous structure, has an excellent bonding strength to the substrate and good corrosion resistance. Its corrosion resistance is better in 10% NaOH solution than in 1 mol/L HCl and 3.5% NaCl. The Fe, P and B contained in the deposit are 27.14%, 2.57% and 6.07% respectively.