CIESC Journal ›› 2011, Vol. 62 ›› Issue (7): 1977-1982.
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ZHANG Liang,TANG Yuming,ZUO Yu
Online:
Published:
张亮,唐聿明,左禹
Abstract:
The failure process of fluorocarbon coating in 3.5% NaCl solution under wet-dry cyclic condition was studied with electrochemical impedance technique,Fourier transform infrared spectrometry(FTIR)and scanning electronic microscope(SEM).The results showed that the failure rate of coating under wet-dry environment was faster than that under complete immersion condition. The wet-dry condition promoted formation of micro-pores in the coating and resulted in decreased coating resistance and increased water absorption. The failure mechanism for fluorocarbon coating under wet-dry environment was suggested. The coating volume experienced swelling and contraction during the wet-dry cycle,which resulted in increased micro-pores and cracks in the coating. Electrolyte entered the coating defects under the action of osmotic pressure,leading to blisters and reduced adhesion of the coating to the substrate.
Key words: 氟碳涂层, 干湿交替, 失效
摘要:
用电化学交流阻抗(EIS)、红外光谱(FTIR)和扫描电镜(SEM)等手段研究了氟碳涂层在干湿交替及全浸泡环境下的失效过程。结果表明,干湿交替环境下氟碳涂层的失效速率快于全浸泡环境下的失效速率,干湿交替环境使得涂层孔隙率增大,涂层的电阻降低,电容增大,加速了电解质溶液在涂层中的渗透;氟碳涂层在干湿交替环境下的失效原因,主要是由于干湿交替循环使涂层经历增大和缩小的往复变化,使得涂层内部孔隙增大,局部产生微裂纹且涂层与基体附着力降低,最终导致涂层起泡及失效。
关键词: 氟碳涂层, 干湿交替, 失效
ZHANG Liang, TANG Yuming, ZUO Yu. Failure process of fluorocarbon coating under wet-dry cycle condition[J]. CIESC Journal, 2011, 62(7): 1977-1982.
张亮, 唐聿明, 左禹. 氟碳涂层在干湿交替环境下失效过程研究 [J]. 化工学报, 2011, 62(7): 1977-1982.
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