摘要
通过溶胶-凝胶法以浸涂的方式用硅烷偶联剂KH-570和硝酸镧分别和共同改性片状锌粉,并将它们制成水性硅酸钾富锌防腐涂料。用沉降体积表征了不同锌粉的分散性。通过机械性能测试、扫描电子显微镜、X射线能谱仪、电化学方法和盐水浸泡法比较了不同锌粉所制富锌涂层的附着力、铅笔硬度、冲击强度、柔韧性、表面形貌、元素含量和耐蚀性。结果表明:经共同改性的锌粉分散性最好,其制备的涂层性能也最好,相比未改性锌粉所制涂层,表干时间缩短20%,表面裂痕减少。涂层经5%NaCl溶液浸泡120h后无明显锈蚀点,在3.5%NaCl溶液中的自腐蚀电位正移,自腐蚀电流密度减小,浸泡9d仍处于浸泡中期,耐蚀性明显增强。
Zinc flakes were modified by silane coupling agent KH-570 and lanthanum nitrate individually and jointly through a sol-gel dip-coating process to produce a waterborne zinc-rich potassium silicate anticorrosive coating material. The dispersion of different zinc flakes was characterized by sediment volume. The adhesion strength, pencil hardness, impact strength, flexibility, surface morphology, chemical composition, and corrosion resistance of the zinc-rich coatings prepared with different modified zinc flakes were compared by mechanical property testing, scanning electron microscopy, X-ray energy-dispersive spectroscopy, electrochemical methods, and salt water immersion method. The results showed that the zinc flakes obtained under combined modification has the best dispersity, and the coating obtained therewith presents the best performances. Compared with the coating made with unmodified zinc flakes, the coating prepared with composite modified zinc flakes features a faster surface drying time （reduced by 20%） and less surface cracks. The coating showed improved corrosion resistance, as shown by no obvious rust corrosion on its surface after immersion in 5% NaCl solution for 120 h, as well as the positive shift of corrosion potential, decrease of self-corrosion current density, and being at medium stage even after immersion for 9 days in 3.5% NaCl solution.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2015年第22期1270-1274,共5页
Electroplating & Finishing
基金
辽宁省沈阳市科技专项资金项目(沈科发[2012]29号)
关键词
片状锌粉
改性
硅烷偶联剂
硝酸镧
分散性
水性富锌防腐涂料
耐蚀性
zinc flake
modification
silane coupling agent
lanthanum nitrate
dispersion
waterborne zinc-rich anticorrosive coating
corrosion resistance
