十二烷基硫酸钠和1.4-丁炔二醇电沉积Ni-W合金的机理

通过络合理论、晶粒特征、表面形貌、微观结构和费卢姆金(φpymknh)方程式,研究十二烷基硫酸钠(SLS)和1.4丁炔二醇(BOZ)2种表面活性剂对Ni-W合金电镀及镀层质量的影响,考察针对性阻化作用机理和镀层硬度下降的原因.结果表明:SLS为0.2g/L、BOZ为0.4g/L时,表面活性剂达到形成胶束的临界浓度CMG...

Mechanism of sodium lauryl sulfate and 1.4-butynediol in electrodepositing Ni-W alloys

The effects of sodium lauryl sulfate(SLS) and 1.4-butynediol(BOZ) on Ni-W electro-deposition,electrodepositing layer quality,targeted inhibition,hardness and corrosion were investigated by complex theory,grain characterization,surface morphology,microstructure and ΦPYMKNH equation.The inhibition mechanism and the cause of hardness decreasing were explored in the present paper.The results show that,when SLS is 0.2 g/L and BOZ is 0.4 g/L,surfactant reaches the critical micelle concentration(CMC),inhibition becomes obvious and the depositing velocity drops quickly.Meanwhile,the Ni-W electrodepositing layers show refine grain and its surface becomes smoother.In addition,corrosion resistance is improved significantly with year corrosion rate(Ke) of 0.0025 mm/y and corrosion resistance of class 2.During the electrodepositing,SLS shows a significant inhibition to tungsten,meaning that tungsten content in the electrodepositing layer and the hardness of the electrodepositing layer decrease with increasing SLS concentration.Small amount of SLS can prevent pinholes and bubbles,while the electroplated layers are dislocated obviously and its surface becomes rough when SLS is 0.4 g/L.However,the dislocated layers and cracks can be removed by adding BOZ.Extraordinary smooth coating is obtained with SLS of 0.2 g/L and BOZ of 0.4 g/L.