摘要
采用海水压力罐模拟深海高压环境,利用电化学阻抗谱(EIS)、三维视频显微镜和扫描电子显微镜(SEM)等手段,对比研究了改性环氧防腐涂层在常压海水环境和模拟深海高压环境(6 MPa海水压力)下的失效行为。结果表明,试样在深海高压环境下浸泡30 d后,涂层阻抗已降低到105Ω·cm^2;而常压环境下,涂层阻抗仅降低到108Ω·cm^2,深海高压环境促使涂层更快地吸水达到饱和状态,高压环境导致涂层下的金属腐蚀活性面积不断增大,基体金属腐蚀速率不断增加。SEM观察表明,高压导致环氧防腐涂层中的颜填料发生脱附,使涂层/金属基体界面弱化,腐蚀活性表面积增大,从而导致涂层破损和基体腐蚀。
The degradation behavior of a modified epoxy resin coating was comparatively studied in sea water at atmospheric pressure and in a simulated deep-sea environment with high hydrostatic pressure of 6 MPa by means of electrochemical impedance spectroscopy（EIS）,3D optical microscope and scanning electron microscope（SEM）.The results showed that the resistance of the coating decreased to105Ω·cm^2 after 30 d immersion under high hydrostatic pressure,while that decreased to 108Ω·cm^2 at atmospheric pressure.The deep-sea environment can induce the enlargement of the active area and shorten the water-saturation process of coatings,therewith,the corrosion rate of the substrate was instantly accelerated.SEM showed that the hydrostatic pressure can deteriorate the attachment of pigments with the epoxy and weaken the adhesion between the epoxy coatings and the metal substrate.In this case,the active area of corrosion was enlarged,whilst the degradation of coatings and the corrosion of the steel substrate simultaneously occurred.
作者
高洪扬
王巍
许立坤
马力
叶章基
李相波
GAO Hongyang WANG Wei XU Likun MA Li YE Zhangji LI Xiangbo(State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266101, China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2017年第3期247-253,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51401185)~~
关键词
深海高压环境
改性环氧涂层
电化学阻抗谱
涂层失效
deep sea environment with high pressure
modified epoxy coating
electrochemical impedance spectroscopy
coating degradation
