酸性化学镀镍磷镀层的动力学及耐蚀性研究
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摘要
采用化学镀方法在Q235钢表面制备Ni-P镀层。采用Autolab电化学工作站探讨了化学镀液成分、施镀温度、p H值等对镀层耐蚀性能的影响,通过计算得到反应动力学方程。结果表明:耐蚀性较优的工艺参数为p H=4.5、温度90℃、主盐Ni SO_4浓度30~35 g/L、还原剂浓度25 g/L、乳酸含量5 m L/L;硫酸镍、氢离子、乳酸、次亚磷酸钠的反应级数分别为1.3408,2.22346,-0.02388,0.18845;化学镀镍磷的表观活化能为4155.06 J/mol,化学镀反应动力学方程为v=0.526C_1~(1.34308)C_2~(2.22346)C_3~(-0.02388)C_4~(0.18845)exp[4155.06(T-298)/(298RT)]
The electroless plating method was used to prepare Ni-P coating on the surface of Q235 steel. The Autolab electrochemical workstation was used to study the effects of chemical bath composition, plating temperature and p H value on the coating properties. The results show that good corrosion resistance can be obtained under the process parameters of p H =4.5, temperature 90 ℃, main salt Ni SO4 concentration 30-35 g/L, reducing agent concentration 25 g/L, lactic acid content 5 m L/L. The reaction grades of nickel sulfate, hydrogen ion, lactic acid and sodium hypophosphite is 1.3408, 2.22346,-0.02388, 0.18845, respectively. The apparent activation energy of electroless nickel-phosphorus is 4155.06 J/mol, and the reaction kinetic equation for electroless plating is v=0.526C_1~(1.34308)C_2~(2.22346)C_3~(-0.02388)C_4~(0.18845)exp[4155.06(T-298)/(298 RT)].
The electroless plating method was used to prepare Ni-P coating on the surface of Q235 steel. The Autolab electrochemical workstation was used to study the effects of chemical bath composition, plating temperature and p H value on the coating properties. The results show that good corrosion resistance can be obtained under the process parameters of p H =4.5, temperature 90 ℃, main salt Ni SO4 concentration 30-35 g/L, reducing agent concentration 25 g/L, lactic acid content 5 m L/L. The reaction grades of nickel sulfate, hydrogen ion, lactic acid and sodium hypophosphite is 1.3408, 2.22346,-0.02388, 0.18845, respectively. The apparent activation energy of electroless nickel-phosphorus is 4155.06 J/mol, and the reaction kinetic equation for electroless plating is v=0.526C_1~(1.34308)C_2~(2.22346)C_3~(-0.02388)C_4~(0.18845)exp[4155.06(T-298)/(298 RT)].
引文
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[2]武慧慧,郝利峰,韩生,等.化学镀镍的研究进展[J].电镀与精饰,2014,36(3):18-21.
[3]Mazaheri H,Allahkaram S R.Deposition characterization and electorchemical evaluation of Ni-P-Nano diamond composite coatings[J].Applied Surface Science,2012,258(10):45-56.
[4]周慧云,李继红,刘斌,等.化学镀镍层缓蚀工艺研究[J].表面技术,2014,43(5):81-86.
[5]Jappes J T,Ramamoorthy B,Nair P K.Novel approaches on the study of wear performance of Ni-P/Diamond composite deposites[J].Journ al of Materials Processing Technology,2009,20(2):1004-1010.
[6]Shao G J,Qin X J,Wang H Y,et al.Influence of RE element on Ni-P coelectrodeposition process[J].Materials Chemistry and Physics,2003,80(1):334-338.
[7]Ashassi S H,Rafizadeh S H.Effect of coating time and heat treatment on structures and corrosion characteristics of electroless Ni-P alloy deposits[J].Surface and Coatings Technology,2004,176(3):318-326.