CAJ | 학술논문

用电化学阻抗技术研究了环氧富锌底漆、环氧云铁中间漆和氟碳面漆构成的多层复合涂层在四种不同腐蚀环境中的失效过程.涂层在四种环境中的失效速率按下列顺序降低:3.5％ NaCl浸泡+紫外照射,45℃湿热环境,35℃盐雾试验,3.5％ NaCl浸泡.尽管涂层在四种不同环境中失效速率差别很大,但不同环境中阻抗中频区的相角,尤其是10 Hz频率静相角,与涂层的低频阻抗值变化趋势非常接近.由于中频区的相角可以快速测量,因此可以作为在工程现场定性评价涂层保护性能的参数.
용전화학조항기술연구료배양부자저칠、배양운철중간칠화불탄면칠구성적다층복합도층재사충불동부식배경중적실효과정.도층재사충배경중적실효속솔안하렬순서강저:3.5％ NaCl침포+자외조사,45℃습열배경,35℃염무시험,3.5％ NaCl침포.진관도층재사충불동배경중실효속솔차별흔대,단불동배경중조항중빈구적상각,우기시10 Hz빈솔정상각,여도층적저빈조항치변화추세비상접근.유우중빈구적상각가이쾌속측량,인차가이작위재공정현장정성평개도층보호성능적삼수.
The failure processes of a multi-layer coating system (zinc-rich epoxy primer,epoxy middle layer,and fluorocarbon topcoat) in four corrosion environments were studied with electrochemical impedance spectroscopy (EIS).The failure rate of the coating system in the four environments decreases in following order:immersion in a 3.5％ NaCl solution under UV light,steam above a water surface at 45 ℃,salt spray at 35 ℃,and immersion in a 3.5％ NaCl solution at room temperature.Although the failure rates of the coating system in the four environments are different,the variations of the phase angles at the middle frequency range,particularly 10 Hz,are very close to that of the coating impedance; hence they may be used as a qualitative evaluation parameter for coating inspection.