摘要
目的测试防蚀膏在某LNG码头钢管桩飞溅区的保护效果。方法模拟飞溅区的干湿交替,利用循环海水浸泡、自腐蚀电位测试、间歇盐雾实验、电化学阻抗测试、极化电阻测试、极化曲线测试,对防蚀膏的防蚀效果进行测试,并与钙基润滑脂、锂基润滑脂的防蚀效果进行对比。结果涂抹三种油脂的钢试样的质量随海水浸泡时间的延长而趋于稳定。防蚀膏和钙基脂试样的自腐蚀电位较正。在盐雾实验中,防蚀膏无红锈,钙基脂和锂基脂试样出现了红锈。防蚀膏试样随实验时间的延长,阻抗未降低,而钙、锂基脂试样均随实验时间的延长出现阻抗降低。防蚀膏的极化电阻是钙、锂基脂的1.5-9倍,钝化区的电流密度是钙、锂基脂的1/100-1/10。结论防蚀膏保护效果最好,钙基脂次之,锂基脂最差。
Objective The study aimed to test the protective effect of anticorrosion grease in the splash zone of the steel pipe piles in a LNG wharf. Methods Circulating seawater immersion test, self-corrosion potential test, intermittent salt spray test, linear polarization test, polarization curve test and electrochemical impedance test were used to test the effect of anticorro- sion grease in the simulating environment of the marine splash zone. The protective effect was compared with the calcium-base grease and lithium-base grease. Results With the extension of soaking time, the weight of the samples covered with all threekinds of greases became stable. The potentials of samples covered with anticorrosion grease and calcium-base grease were more positive. In salt spray test, the samples covered with anticorrosion grease had no red rust, while those with calcium-base grease and lithium grease had red rust. With the extension of experimental time, the impedance of anticorrosion grease had no obvious change, while those of calcium-base grease and lithium-grease decreased rapidly. The polarization resistance of anticorrosion grease was 1.5-9 times as high as those of the calcium-base grease and lithium-base grease. The current density of anticorrosion grease in the passivation region was about 1/100 - 1/10 of those of calcium-base grease and lithium-base grease. Conclusion The protective effect of anticorrosion grease was the best, followed by calcium-base grease, and then lithium-base grease.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2016年第5期194-200,共7页
Surface Technology
基金
国家自然科学基金(41376003)
国家科技支撑计划(2012BAB15B00)~~
关键词
浪花飞溅区
包覆防腐
防蚀膏
盐雾实验
电化学阻抗
线性极化
极化曲线
splash zone
multilayer coating
anticorrosion grease
salt spray test
electrochemical impedance
linear polari-zation
polarization curve
