SiO_2颗粒对碳钢表面电化学特性的影响  

Influence of SiO_2 Particles on Electrochemical Characteristics of Carbon Steel

作　　者：李爱娇[1] 王燕华[1] 钟莲[1] 王佳[1] 冯林[1] 杨培培[1] 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《材料研究学报》2017年第6期422-428,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51131005);山东省优秀中青年科学家奖励基金(BS2012HZ021)~~

摘　　要：应用阵列电极技术、电化学阻抗技术等研究了惰性固体颗粒SiO_2对碳钢表面电化学特性的影响。研究发现,液滴在碳钢表面的铺展因子随SiO_2沉积量增加而增大,腐蚀活性区域增加。另一方面SiO_2颗粒在碳钢表面的沉积改变了液滴下碳钢电化学阻抗谱图,阻抗谱中出现两个容抗弧,高频容抗弧反映了其物理阻挡作用。液滴下碳钢腐蚀受液滴铺展和SiO_2颗粒物理阻挡两方面共同作用。平均电流值随SiO_2沉积量先减小后增大,所以SiO_2沉积量存在一个临界值。低于临界值时,惰性SiO_2颗粒阻碍腐蚀;高于临界值时,则加速腐蚀。The influence of inert solid particles SiO_2 on electrochemical characteristics of carbon steel was studied by using the array electrode technique and the electrochemical impedance spectroscopy. It was found that the spreadability of droplets increased with the increase of the amount of SiO_2,as well as the corrosion activity area.In addition, the impedance spectra showed two capacitive loops with the deposition of SiO_2 particles, and the capacitive loop in the high frequencies was attributed to the blocking effect of the SiO_2 particles. The corrosion behavior of carbon steel was affected by these two aspects, the spreadability of droplets and the blocking effect of the SiO_2 particles. With the increase of the amount of SiO_2, the average current value decreased firstly and then increased. There was a critical value in the deposition amount of SiO_2 particles. When the amount was lower than the critical value, it could hinder corrosion. While, when the amount was higher than the critical value, it would accelerate corrosion owing to the expansion of droplets.

关 键 词：材料失效与保护 铺展因子 阵列电极 沉积量 SIO2颗粒 

分 类 号：TG172[金属学及工艺—金属表面处理]