摘要
在钢试片上成功沉积了钛酸钾晶须增强镍磷基化学复合镀层。在经典复合电沉积机制基础上,考虑到粒子在镀件表面的吸附强度分布,将粒子的吸附分为弱吸附和强吸附,建立了相应的化学复合沉积动力学模型。该模型在钛酸钾晶须与镍磷合金的复合共沉积体系中,镀液pH值为3.5～5.5范围内得到了验证。通过数学模型和实验结果研究了pH值、镀液中粒子浓度对粒子共析量、有效吸附概率的影响规律。结果表明:随着镀液pH值的增加,沉积层的粒子体积分数先增加,后减小,在pH值为4.5～5.5之间出现极大值。随着镀液中粒子悬浮量的增加,镀层中粒子的共析量相应增加。粒子在镀件表面的有效吸附概率和平均吸附强度与pH值呈线性关系,斜率为正值。
The Ni-P-K2Ti6013 whiskers composite coating was deposited on the surface of steel slice via electroless plat- ing process. A new kinetic model for the electroless codeposition of （potassium titanate whisker）PTWs particles with Ni-P alloys was presented, which is based on the classical electrochemical codeposition mechanism. The critical adsorption strength was used to classify the adsorption into effective adsorption and non-effective adsorption. model relating the content of embedded particles to suspension concentration was deduced. This A kinetic mathematical relationship was verified experimentally by the codeposition systems of PTWs/Ni-P at the pH ranged from 3.5 to 5.5. The relationship between the content of particles in deposits and the pH values can be expressed by a sole-peak variation, the maximum occurs when pH value is 4. 5 ～ 5.5. The variation of the content of particles in deposits with pH value is an overall balance of two opposing effects, which leads to a maximum on the theory and experimental data. The probability of effective adsorption will increase linearly as the pH values increase.
出处
《润滑与密封》
CAS
CSCD
北大核心
2007年第10期93-96,共4页
Lubrication Engineering
关键词
钛酸钾晶须
共沉积机制
化学复合镀
potassium titanate whisker
codeposition mechanism
electroless composite plating
