首页|成膜温度对无铬达克罗涂层结构组成和耐蚀性的影响

成膜温度对无铬达克罗涂层结构组成和耐蚀性的影响

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[目的]温度对水性无铬达克罗涂层成膜机制的影响尚不明确.[方法]采用KH560硅烷偶联剂作为成膜物,钼酸盐作为钝化剂,片状锌、铝粉作为牺牲阳极组分,制备出一种水性无铬达克罗涂料.采用扫描电镜(SEM)、能谱(EDS)、X射线衍射(XRD)、中性盐雾试验、电化学测量等手段对不同温度(240～600 ℃)下成膜后涂层的表面形貌、相组成及耐蚀性进行表征与分析.[结果]成膜温度为330 ℃和390 ℃时,涂层微观结构最佳,片状锌、铝粉层层叠加,且表面光滑平整,无明显缺陷,经720 h中性盐雾试验后无红锈.成膜温度为330 ℃时,涂层的腐蚀电流密度最小,极化电阻最大,表现出优异的防护性能.[结论]成膜温度太高或太低都不利于获得耐蚀性良好的无铬达克罗涂层.
Effect of temperature on microstructure and corrosion resistance of chromium-free Dacromet coating
[Introduction]The effect of temperature on formation mechanism of water-based chromium-free Dacromet coating is unclear.[Method]A water-based chromium-free Dacromet paint was prepared with KH560 silane coupling agent as binder,molybdate as passivator,and flaky zinc and aluminum powders as sacrificial anodes.The surface morphology,phase structure,and corrosion resistance of the Dacromet coating formed at different temperature in a range from 240 to 600 ℃ were examined by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),X-ray diffraction(XRD),neutral salt spray testing,and electrochemical measurement.[Result]The coatings formed at 330 ℃ and 390 ℃ featured an ideal layering structure with zinc and aluminum flakes,and a smooth and level surface without obvious defects.They endured 720 hours to red rust in neutral salt spray test.The coating formed at 330℃ had the minimum corrosion current density and the highest polarization resistance,showing excellent anticorrosion performance.[Conclusion]Too high or too low film-forming temperature is not conducive to the formation of well-resistant chromium-free Dacromet coatings.

water-based chromium-free Dacromet coatingzincaluminumfilm-forming temperaturecorrosion resistanceelectrochemistry

徐驰、卞启玉、邓志远、徐哲婷、殷成龙、秦孔飞、侯琳琳、高雪莹、张晔娜、李庆鹏、杨宏强

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沈阳化工大学材料科学与工程学院,辽宁 沈阳 110142

沈阳市新型功能涂层材料重点实验室,辽宁 沈阳 110142

沈阳市航达科技有限责任公司,辽宁 沈阳 110034

水性无铬达克罗涂层 锌 铝 成膜温度 耐蚀性 电化学

国家级大学生创新创业训练计划项目2021年辽宁省"揭榜挂帅"科技攻关项目辽宁省教育厅2021年面上项目中国-西班牙材料联合实验室

2023101490012021JH1/10400091LJK Z04702022JH2/10700005

2024

10.19289/j.1004-227x.2024.02.017

电镀与涂饰
广州市二轻工业科学技术研究所

电镀与涂饰

CSTPCD北大核心
影响因子：0.47
ISSN：1004-227X
年,卷(期)：2024.43(2)
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