摘要
利用斑点试验、点蚀试验、电化学测试及扫描电镜等方法 ,研究了熔敷温度、保温时间和稀土添加量等工艺参数对热熔敷法制备的玻璃涂层耐蚀性的影响 ,探讨了添加稀土提高玻璃涂层耐蚀性的机理。试验结果表明 ,采用热熔敷法制备的玻璃涂层有较好的耐蚀性。随着熔敷温度的提高和保温时间的延长 ,形成了一定量的晶相后会降低涂层的耐蚀性。试验结果表明 ,熔敷温度为 70 0℃、保温 5min后能够得到耐蚀性良好的玻璃涂层。添加稀土提高了釉料的软化温度和熔融釉料的粘度 ,阻止了结晶形核和晶核长大 ,减少了晶相 ,同时提高了涂层的电极电位 ,使涂层耐蚀性显著提高。当稀土含量为 2 %时 ,涂层的耐蚀性较好。
The effects of processing parameters and adding rare earth on the corrosion resistance of glass coatings on metal surface were studied by means of electrochemical test, immersion test,pitting test and scanning electron microscope. The mechanism of adding rare earth for enhancing the corrosion resistance of glass coating prepared with thermal deposition method was analyzed. The results of experiments show that the glass coatings prepared with thermal deposition method have better corrosion resistance under the conditions of 700 ℃ deposition temperature and heat preservation for five minutes. Adding rare earth into the frit can improve the corrosion resistance of glass coatings. Increasing the deposition temperature and prolonging the heat preservation time will result in more crystals in the glass coatings and reduce the corrosion resistance of the glass coating. Adding rare earth can increase the melting temperature and the viscosity of frit, and it also can inhibit the generation of crystal nucleus and the growth of crystals. In addition, it can decrease the crystals in the coatings and enhance electrode potential of glass coatings. The corrosion resistance of glass coating is the best, when the concentration of rare earth is two percent.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2003年第5期81-83,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
教育部高等学校骨干教师资助计划项目 (K0 0 0 3 0 7A)
