%0 Journal Article
%T EVALUATION OF POROSITY OF HARD COATINGS BY CORROSION ELECTROCHEMSTRY<br>腐蚀电化学方法评价硬质涂层孔隙率
%A YANG Hai-gang
%A ZHU Xue-mei
%A LEI Ming-kai
%A <br>杨海钢
%A 朱雪梅
%A 雷明凯
%J 腐蚀科学与防护技术
%D 2005
%I 
%X 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 %.
%K porosity of coating
%K electrochemical impedance
%K anodic polarization
%K reviewing<br>涂层孔隙率
%K 电化学阻抗
%K 阳极极化
%K 综述
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=9F6E6EC8BA5BB62698F6640073DDD6E1&aid=7DFD044AA43123D5&yid=2DD7160C83D0ACED&vid=BCA2697F357F2001&iid=B31275AF3241DB2D&sid=09AA1448D1EAF9C1&eid=84A93BA251D28205&journal_id=1002-6495&journal_name=腐蚀科学与防护技术&referenced_num=0&reference_num=35