摘要
综述了以电化学阻抗理论为基础的一维孔传输线模型、有限扩散模型和以阳极极化理论为基础的多孔涂层电极模型计算金属表面硬质涂层孔隙率的原理及其测量方法.一维孔传输线模型依据涂层体系与涂层、基体间极化电阻的关系计算孔隙率;有限扩散模型则利用孔隙率与扩散系数和频率间的函数关系测定;多孔涂层电极模型利用涂层体系和金属基体间极化电流密度,极化电阻,自腐蚀电位和库仑电量等参数分别确定孔隙率.比较测定的硬质涂层孔隙率,不同工艺条件下孔隙率的测量范围为0.001%～50%;测量精度在80%以上.
The principle and the measurement for the porosity of hard coatings on the metal surfaces were summarized. The transmission line model for a single one - dimensional pore and finite diffusion model based on electrochemical impedance theory and the porous coating model based on anodic polarization theory were provided. The porosity measured by the transmission line model was obtained through the relation of polarization resistances of coating-substrate system and coating and substrate. Using the function between the porosity and the diffusion coefficient and frequency in the diffusion impedance, the finite diffusion model evaluated the porosity. For the porous coating model, the porosity was determined by the parameters of the anodic current densities, polarization resistances, corrosion potentials and coulometric charges between the coated and the substrate, respectively. Compared with the porosity determined from measurements for hard coatings deposited under different processing conditions, the range of the porosity was 0. 001% - 50 %. The measurement precision was above 80 %.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2005年第6期413-417,共5页
Corrosion Science and Protection Technology
关键词
涂层孔隙率
电化学阻抗
阳极极化
综述
porosity of coating
electrochemical impedance
anodic polarization
reviewing
